Updated on 2022/11/09

写真a

 
WATANABE, Sei-ichiro
 
Organization
Graduate School of Environmental Studies Department of Earth and Environmental Sciences Earth and Planetary Physics Professor
Graduate School
Graduate School of Environmental Studies
Undergraduate School
School of Science
Title
Professor
Contact information
メールアドレス

Degree 1

  1. Doctor of Science ( 1991.6   The University of Tokyo ) 

Research Interests 4

  1. 惑星科学

  2. 基礎環境学

  3. 惑星探査

  4. 地球初期進化

Research Areas 4

  1. Others / Others  / Planetary Science

  2. Others / Others  / Science@Astronomy

  3. Others / Others  / Science@Earth Science@Physics of Solid Earth

  4. Others / Others  / Interdisciprinary Area@Environmental Science@Environmental Dynamic Analysis

Current Research Project and SDGs 4

  1. 小惑星探査ミッション「はやぶさ2」の統合サイエンス

  2. fundations of environmental studies

  3. Theoritical Research of Planetary formation

  4. Evolution of Protoplanetary disks

Research History 10

  1. Nagoya University   Graduate School of Environmental studies, Department of Earth and Planetary Sciences, Earth and Planetary Physics   Professor

    2008.4

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    Country:Japan

  2. 宇宙航空研究開発機構   宇宙科学研究所   研究員

    2020.4

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    Country:Japan

  3. 宇宙航空研究開発機構   宇宙科学研究所   教授

    2012.4 - 2020.3

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    Country:Japan

  4. Kobe University   Researcher

    2008.4

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    Country:Japan

  5. Nagoya University   Graduate School of Environmental studies, Department of Earth and Planetary Sciences, Earth and Planetary Physics   Associate professor

    2007.4 - 2008.3

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    Country:Japan

  6. University of California, Santa Cruz   Chief Researcher

    2006.7 - 2007.3

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    Country:United States

  7. Nagoya University   Assistant Professor

    2001.4 - 2007.3

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    Country:Japan

  8. Nagoya University   Assistant Professor

    1996.4 - 2001.3

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    Country:Japan

  9. Nagoya University   Faculty of Science, Department of Earth and Planetary Sciences, Earth and Planetary Physics   Assistant

    1993.2 - 1996.3

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    Country:Japan

  10. Yamagata University   Faculty of Science, Data Processing Center   Assistant Professor

    1990.6 - 1993.1

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    Country:Japan

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Education 3

  1. The University of Tokyo   Graduate School, Division of Science   Geophysics

    - 1990

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    Country: Japan

  2. The University of Tokyo   Graduate School, Division of Science   Geophysics

    - 1988

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    Country: Japan

  3. The University of Tokyo   Faculty of Science   Department of Geophysics

    - 1986

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    Country: Japan

Professional Memberships 9

  1. The Japanese Society for Planetry Sciences   President

    2011.1 - 2012.12

  2. 日本惑星科学会   副会長

    2009.1 - 2010.12

  3. 日本惑星科学会   副会長

    2013.1 - 2014.12

  4. 地球惑星科学連合   理事

    2012.5 - 2018.5

  5. 日本惑星科学会   運営委員

    1997.4 - 2018.12

  6. 地球惑星科学連合   代議員

    2009.4

  7. The Astronomical Society of Japan

    1989.8

  8. Japan Geoscience Union

    2006.5

  9. 日本惑星科学会   会員

    1992.4

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Committee Memberships 3

  1. 日本学術会議   地球惑星科学委員会  

    2014.10   

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    Committee type:Government

  2. 国立天文台   プロジェクト評価委員  

    2020.4   

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    Committee type:Other

  3. 宇宙科学研究所   宇宙理学委員  

    2011.6   

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    Committee type:Other

    大学共同利用

Awards 2

  1. 内閣総理大臣顕彰

    2020.12   国   はやぶさ2によるリュウグウ探査

    はやぶさ2プロジェクトチーム

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    Award type:International academic award (Japan or overseas) 

    チームとしての受賞.渡邊誠一郎は,はやぶさ2プロジェクトサイエンティストとしてミッションの科学成果創出を統括した

  2. IAF World Space Award

    2021.10   International Astronautical Federation   Hayabusa2

    Hayabusa2 Team

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    Award type:International academic award (Japan or overseas) 

 

Papers 158

  1. Site selection for the Hayabusa2 artificial cratering and subsurface material sampling on Ryugu Reviewed

    Shota Kikuchi, Sei-ichiro Watanabe, Koji Wada, Takanao Saiki, Hikaru Yabuta, Seiji Sugita, Masanao Abe, Masahiko Arakawa, Yuichiro Cho, Masahiko Hayakawa, Naoyuki Hirata, Naru Hirata, Chikatoshi Honda, Rie Honda, Ko Ishibashi, Yoshiaki Ishihara, Takahiro Iwata, Toshihiko Kadono, Shingo Kameda, Kohei Kitazato, Toru Kouyama, Koji Matsumoto, Moe Matsuoka, Tatsuhiro Michikami, Yuya Mimasu, Akira Miura, Tomokatsu Morota, Tomoki Nakamura, Satoru Nakazawa, Noriyuki Namiki, Rina Noguchi, Kazunori Ogawa, Naoko Ogawa, Tatsuaki Okada, Go Ono, Naoya Sakatani, Hirotaka Sawada, Hiroki Senshu, Yuri Shimaki, Kei Shirai, Shogo Tachibana, Yuto Takei, Satoshi Tanaka, Eri Tatsumi, Fuyuto Terui, Manabu Yamada, Yukio Yamamoto, Yasuhiro Yokota, Kent Yoshikawa, Makoto Yoshikawa, Yuichi Tsuda

    Planetary and Space Science   Vol. 219   page: 105519 - 105519   2022.9

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.pss.2022.105519

    Web of Science

  2. A pristine record of outer Solar System materials from asteroid Ryugu’s returned sample Reviewed International coauthorship

    Motoo Ito, Naotaka Tomioka, Masayuki Uesugi, Akira Yamaguchi, Naoki Shirai, Takuji Ohigashi, Ming-Chang Liu, Richard C. Greenwood, Makoto Kimura, Naoya Imae, Kentaro Uesugi, Aiko Nakato, Kasumi Yogata, Hayato Yuzawa, Yu Kodama, Akira Tsuchiyama, Masahiro Yasutake, Ross Findlay, Ian A. Franchi, James A. Malley, Kaitlyn A. McCain, Nozomi Matsuda, Kevin D. McKeegan, Kaori Hirahara, Akihisa Takeuchi, Shun Sekimoto, Ikuya Sakurai, Ikuo Okada, Yuzuru Karouji, Masahiko Arakawa, Atsushi Fujii, Masaki Fujimoto, Masahiko Hayakawa, Naoyuki Hirata, Naru Hirata, Rie Honda, Chikatoshi Honda, Satoshi Hosoda, Yu-ichi Iijima, Hitoshi Ikeda, Masateru Ishiguro, Yoshiaki Ishihara, Takahiro Iwata, Kosuke Kawahara, Shota Kikuchi, Kohei Kitazato, Koji Matsumoto, Moe Matsuoka, Tatsuhiro Michikami, Yuya Mimasu, Akira Miura, Osamu Mori, Tomokatsu Morota, Satoru Nakazawa, Noriyuki Namiki, Hirotomo Noda, Rina Noguchi, Naoko Ogawa, Kazunori Ogawa, Tatsuaki Okada, Chisato Okamoto, Go Ono, Masanobu Ozaki, Takanao Saiki, Naoya Sakatani, Hirotaka Sawada, Hiroki Senshu, Yuri Shimaki, Kei Shirai, Seiji Sugita, Yuto Takei, Hiroshi Takeuchi, Satoshi Tanaka, Eri Tatsumi, Fuyuto Terui, Ryudo Tsukizaki, Koji Wada, Manabu Yamada, Tetsuya Yamada, Yukio Yamamoto, Hajime Yano, Yasuhiro Yokota, Keisuke Yoshihara, Makoto Yoshikawa, Kent Yoshikawa, Ryota Fukai, Shizuho Furuya, Kentaro Hatakeda, Tasuku Hayashi, Yuya Hitomi, Kazuya Kumagai, Akiko Miyazaki, Masahiro Nishimura, Hiromichi Soejima, Ayako Iwamae, Daiki Yamamoto, Miwa Yoshitake, Toru Yada, Masanao Abe, Tomohiro Usui, Sei-ichiro Watanabe, Yuichi Tsuda

    Nature Astronomy     2022.8

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    Volatile and organic-rich C-type asteroids may have been one of the main sources of Earth’s water. Our best insight into their chemistry is currently provided by carbonaceous chondritic meteorites, but the meteorite record is biased: only the strongest types survive atmospheric entry and are then modified by interaction with the terrestrial environment. Here we present the results of a detailed bulk and microanalytical study of pristine Ryugu particles, brought to Earth by the Hayabusa2 spacecraft. Ryugu particles display a close compositional match with the chemically unfractionated, but aqueously altered, CI (Ivuna-type) chondrites, which are widely used as a proxy for the bulk Solar System composition. The sample shows an intricate spatial relationship between aliphatic-rich organics and phyllosilicates and indicates maximum temperatures of ~30 °C during aqueous alteration. We find that heavy hydrogen and nitrogen abundances are consistent with an outer Solar System origin. Ryugu particles are the most uncontaminated and unfractionated extraterrestrial materials studied so far, and provide the best available match to the bulk Solar System composition.

    DOI: 10.1038/s41550-022-01745-5

    Web of Science

    Other Link: https://www.nature.com/articles/s41550-022-01745-5

  3. Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites Reviewed International coauthorship

    Tetsuya Yokoyama, Kazuhide Nagashima, Izumi Nakai, Edward D. Young, Yoshinari Abe, Jérôme Aléon, Conel M. O’D. Alexander, Sachiko Amari, Yuri Amelin, Ken-ichi Bajo, Martin Bizzarro, Audrey Bouvier, Richard W. Carlson, Marc Chaussidon, Byeon-Gak Choi, Nicolas Dauphas, Andrew M. Davis, Tommaso Di Rocco, Wataru Fujiya, Ryota Fukai, Ikshu Gautam, Makiko K. Haba, Yuki Hibiya, Hiroshi Hidaka, Hisashi Homma, Peter Hoppe, Gary R. Huss, Kiyohiro Ichida, Tsuyoshi Iizuka, Trevor R. Ireland, Akira Ishikawa, Motoo Ito, Shoichi Itoh, Noriyuki Kawasaki, Noriko T. Kita, Kouki Kitajima, Thorsten Kleine, Shintaro Komatani, Alexander N. Krot, Ming-Chang Liu, Yuki Masuda, Kevin D. McKeegan, Mayu Morita, Kazuko Motomura, Frédéric Moynier, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Laurette Piani, Liping Qin, Sara S. Russell, Naoya Sakamoto, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Shigekazu Yoneda, Hiroharu Yui, Ai-Cheng Zhang, Harold C. Connolly Jr., Dante S. Lauretta, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Masahiko Arakawa, Atsushi Fujii, Masahiko Hayakawa, Naoyuki Hirata, Naru Hirata, Rie Honda, Chikatoshi Honda, Satoshi Hosoda, Yu-ichi Iijima, Hitoshi Ikeda, Masateru Ishiguro, Yoshiaki Ishihara, Takahiro Iwata, Kosuke Kawahara, Shota Kikuchi, Kohei Kitazato, Koji Matsumoto, Moe Matsuoka, Tatsuhiro Michikami, Yuya Mimasu, Akira Miura, Tomokatsu Morota, Satoru Nakazawa, Noriyuki Namiki, Hirotomo Noda, Rina Noguchi, Naoko Ogawa, Kazunori Ogawa, Tatsuaki Okada, Chisato Okamoto, Go Ono, Masanobu Ozaki, Takanao Saiki, Naoya Sakatani, Hirotaka Sawada, Hiroki Senshu, Yuri Shimaki, Kei Shirai, Seiji Sugita, Yuto Takei, Hiroshi Takeuchi, Satoshi Tanaka, Eri Tatsumi, Fuyuto Terui, Yuichi Tsuda, Ryudo Tsukizaki, Koji Wada, Sei-ichiro Watanabe, Manabu Yamada, Tetsuya Yamada, Yukio Yamamoto, Hajime Yano, Yasuhiro Yokota, Keisuke Yoshihara, Makoto Yoshikawa, Kent Yoshikawa, Shizuho Furuya, Kentaro Hatakeda, Tasuku Hayashi, Yuya Hitomi, Kazuya Kumagai, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Hiromichi Soejima, Ayako Suzuki, Toru Yada, Daiki Yamamoto, Kasumi Yogata, Miwa Yoshitake, Shogo Tachibana, Hisayoshi Yurimoto

    SCIENCE     2022.6

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1126/science.abn7850

  4. On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective Reviewed

    Eizo NAKAMURA, Katsura KOBAYASHI, Ryoji TANAKA, Tak KUNIHIRO, Hiroshi KITAGAWA, Christian POTISZIL, Tsutomu OTA, Chie SAKAGUCHI, Masahiro YAMANAKA, Dilan M. RATNAYAKE, Havishk TRIPATHI, Rahul KUMAR, Maya-Liliana AVRAMESCU, Hidehisa TSUCHIDA, Yusuke YACHI, Hitoshi MIURA, Masanao ABE, Ryota FUKAI, Shizuho FURUYA, Kentaro HATAKEDA, Tasuku HAYASHI, Yuya HITOMI, Kazuya KUMAGAI, Akiko MIYAZAKI, Aiko NAKATO, Masahiro NISHIMURA, Tatsuaki OKADA, Hiromichi SOEJIMA, Seiji SUGITA, Ayako SUZUKI, Tomohiro USUI, Toru YADA, Daiki YAMAMOTO, Kasumi YOGATA, Miwa YOSHITAKE, Masahiko ARAKAWA, Atsushi FUJII, Masahiko HAYAKAWA, Naoyuki HIRATA, Naru HIRATA, Rie HONDA, Chikatoshi HONDA, Satoshi HOSODA, Yu-ichi IIJIMA, Hitoshi IKEDA, Masateru ISHIGURO, Yoshiaki ISHIHARA, Takahiro IWATA, Kosuke KAWAHARA, Shota KIKUCHI, Kohei KITAZATO, Koji MATSUMOTO, Moe MATSUOKA, Tatsuhiro MICHIKAMI, Yuya MIMASU, Akira MIURA, Tomokatsu MOROTA, Satoru NAKAZAWA, Noriyuki NAMIKI, Hirotomo NODA, Rina NOGUCHI, Naoko OGAWA, Kazunori OGAWA, Chisato OKAMOTO, Go ONO, Masanobu OZAKI, Takanao SAIKI, Naoya SAKATANI, Hirotaka SAWADA, Hiroki SENSHU, Yuri SHIMAKI, Kei SHIRAI, Yuto TAKEI, Hiroshi TAKEUCHI, Satoshi TANAKA, Eri TATSUMI, Fuyuto TERUI, Ryudo TSUKIZAKI, Koji WADA, Manabu YAMADA, Tetsuya YAMADA, Yukio YAMAMOTO, Hajime YANO, Yasuhiro YOKOTA, Keisuke YOSHIHARA, Makoto YOSHIKAWA, Kent YOSHIKAWA, Masaki FUJIMOTO, Sei-ichiro WATANABE, Yuichi TSUDA

    Proceedings of the Japan Academy, Series B   Vol. 98 ( 6 ) page: 227 - 282   2022.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Academy  

    DOI: 10.2183/pjab.98.015

    Web of Science

  5. Pebbles and sand on asteroid (162173) Ryugu: In situ observation and particles returned to Earth Reviewed International coauthorship

    Tachibana, S., Sawada, H., Okazaki, R., Takano, Y., Sakamoto, K., Miura, Y. N., Okamoto, C., Yano, H., Yamanouchi, S., Michel, P., Zhang, Y., Schwartz, S., Thuillet, F., Yurimoto, H., Nakamura, T., Noguchi, T., Yabuta, H., Naraoka, H., Tsuchiyama, A., Imae, N., Kurosawa, K., Nakamura, A. M., Ogawa, K., Sugita, S., Morota, T., Honda, R., Kameda, S., Tatsumi, E., Cho, Y., Yoshioka, K., Yokota, Y., Hayakawa, M., Matsuoka, M., Sakatani, N., Yamada, M., Kouyama, T., Suzuki, H., Honda, C., Yoshimitsu, T., Kubota, T., Demura, H., Yada, T., Nishimura, M., Yogata, K., Nakato, A., Yoshitake, M., Suzuki, A. I., Furuya, S., Hatakeda, K., Miyazaki, A., Kumagai, K., Okada, T., Abe, M., Usui, T., Ireland, T. R., Fujimoto, M., Yamada, T., Arakawa, M., Connolly, H. C., Fujii, A., Hasegawa, S., Hirata, N., Hirata, N., Hirose, C., Hosoda, S., Iijima, Y., Ikeda, H., Ishiguro, M., Ishihara, Y., Iwata, T., Kikuchi, S., Kitazato, K., Lauretta, D. S., Libourel, G., Marty, B., Matsumoto, K., Michikami, T., Mimasu, Y., Miura, A., Mori, O., Nakamura-Messenger, K., Namiki, N., Nguyen, A. N., Nittler, L. R., Noda, H., Noguchi, R., Ogawa, N., Ono, G., Ozaki, M., Senshu, H., Shimada, T., Shimaki, Y., Shirai, K., Soldini, S., Takahashi, T., Takei, Y., Takeuchi, H., Tsukizaki, R., Wada, K., Yamamoto, Y., Yoshikawa, K., Yumoto, K., Zolensky, M. E., Nakazawa, S., Terui, F., Tanaka, S., Saiki, T., Yoshikawa, M., Watanabe, S., Tsuda, Y.

    Science   Vol. 375 ( 6584 ) page: 1011 - +   2022.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Association for the Advancement of Science (AAAS)  

    The Hayabusa2 spacecraft investigated the C-type (carbonaceous) asteroid (162173) Ryugu. The mission performed two landing operations to collect samples of surface and subsurface material, the latter exposed by an artificial impact. We present images of the second touchdown site, finding that ejecta from the impact crater was present at the sample location. Surface pebbles at both landing sites show morphological variations ranging from rugged to smooth, similar to Ryugu’s boulders, and shapes from quasi-spherical to flattened. The samples were returned to Earth on 6 December 2020. We describe the morphology of >5 grams of returned pebbles and sand. Their diverse color, shape, and structure are consistent with the observed materials of Ryugu; we conclude that they are a representative sample of the asteroid....

    DOI: 10.1126/science.abj8624

    Web of Science

  6. First compositional analysis of Ryugu samples by the MicrOmega hyperspectral microscope Reviewed International coauthorship

    C. Pilorget, T. Okada, V. Hamm, R. Brunetto, T. Yada, D. Loizeau, L. Riu, T. Usui, A. Moussi-Soffys, K. Hatakeda, A. Nakato, K. Yogata, M. Abe, A. Aléon-Toppani, J. Carter, M. Chaigneau, B. Crane, B. Gondet, K. Kumagai, Y. Langevin, C. Lantz, T. Le Pivert-Jolivet, G. Lequertier, L. Lourit, A. Miyazaki, M. Nishimura, F. Poulet, M. Arakawa, N. Hirata, K. Kitazato, S. Nakazawa, N. Namiki, T. Saiki, S. Sugita, S. Tachibana, S. Tanaka, M. Yoshikawa, Y. Tsuda, S. Watanabe, J.-P. Bibring

    Nature Astronomy   Vol. 6 ( 2 ) page: 221 - 225   2022.2

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1038/s41550-021-01549-z

    Web of Science

    Other Link: https://www.nature.com/articles/s41550-021-01549-z

  7. Preliminary analysis of the Hayabusa2 samples returned from C-type asteroid Ryugu Reviewed International coauthorship

    Toru Yada, Masanao Abe, Tatsuaki Okada, Aiko Nakato, Kasumi Yogata, Akiko Miyazaki, Kentaro Hatakeda, Kazuya Kumagai, Masahiro Nishimura, Yuya Hitomi, Hiromichi Soejima, Miwa Yoshitake, Ayako Iwamae, Shizuho Furuya, Masayuki Uesugi, Yuzuru Karouji, Tomohiro Usui, Tasuku Hayashi, Daiki Yamamoto, Ryota Fukai, Seiji Sugita, Yuichiro Cho, Koki Yumoto, Yuna Yabe, Jean-Pierre Bibring, Cedric Pilorget, Vincent Hamm, Rosario Brunetto, Lucie Riu, Lionel Lourit, Damien Loizeau, Guillaume Lequertier, Aurelie Moussi-Soffys, Shogo Tachibana, Hirotaka Sawada, Ryuji Okazaki, Yoshinori Takano, Kanako Sakamoto, Yayoi N. Miura, Hajime Yano, Trevor R. Ireland, Tetsuya Yamada, Masaki Fujimoto, Kohei Kitazato, Noriyuki Namiki, Masahiko Arakawa, Naru Hirata, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Hikaru Yabuta, Hiroshi Naraoka, Motoo Ito, Eizo Nakamura, Kentaro Uesugi, Katsura Kobayashi, Tatsuhiro Michikami, Hiroshi Kikuchi, Naoyuki Hirata, Yoshiaki Ishihara, Koji Matsumoto, Hirotomo Noda, Rina Noguchi, Yuri Shimaki, Kei Shirai, Kazunori Ogawa, Koji Wada, Hiroki Senshu, Yukio Yamamoto, Tomokatsu Morota, Rie Honda, Chikatoshi Honda, Yasuhiro Yokota, Moe Matsuoka, Naoya Sakatani, Eri Tatsumi, Akira Miura, Manabu Yamada, Atsushi Fujii, Chikako Hirose, Satoshi Hosoda, Hitoshi Ikeda, Takahiro Iwata, Shota Kikuchi, Yuya Mimasu, Osamu Mori, Naoko Ogawa, Go Ono, Takanobu Shimada, Stefania Soldini, Tadateru Takahashi, Yuto Takei, Hiroshi Takeuchi, Ryudo Tsukizaki, Kent Yoshikawa, Fuyuto Terui, Satoru Nakazawa, Satoshi Tanaka, Takanao Saiki, Makoto Yoshikawa, Sei-ichiro Watanabe, Yuichi Tsuda

    Nature Astronomy   Vol. 6 ( 2 ) page: 214 - +   2022.2

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    C-type asteroids<sup>1</sup> are considered to be primitive small Solar System bodies enriched in water and organics, providing clues to the origin and evolution of the Solar System and the building blocks of life. C-type asteroid 162173 Ryugu has been characterized by remote sensing<sup>2–7</sup> and on-asteroid measurements<sup>8,9</sup> with Hayabusa2 (ref. <sup>10</sup>). However, the ground truth provided by laboratory analysis of returned samples is invaluable to determine the fine properties of asteroids and other planetary bodies. We report preliminary results of analyses on returned samples from Ryugu of the particle size distribution, density and porosity, spectral properties and textural properties, and the results of a search for Ca–Al-rich inclusions (CAIs) and chondrules. The bulk sample mainly consists of rugged and smooth particles of millimetre to submillimetre size, confirming that the physical and chemical properties were not altered during the return from the asteroid. The power index of its size distribution is shallower than that of the surface boulder observed on Ryugu<sup>11</sup>, indicating differences in the returned Ryugu samples. The average of the estimated bulk densities of Ryugu sample particles is 1,282 ± 231 kg m<sup>−3</sup>, which is lower than that of meteorites<sup>12</sup>, suggesting a high microporosity down to the millimetre scale, extending centimetre-scale estimates from thermal measurements<sup>5,9</sup>. The extremely dark optical to near-infrared reflectance and spectral profile with weak absorptions at 2.7 and 3.4 μm imply a carbonaceous composition with indigenous aqueous alteration, matching the global average of Ryugu<sup>3,4</sup> and confirming that the sample is representative of the asteroid. Together with the absence of submillimetre CAIs and chondrules, these features indicate that Ryugu is most similar to CI chondrites but has lower albedo, higher porosity and more fragile characteristics.

    DOI: 10.1038/s41550-021-01550-6

    Web of Science

    Other Link: https://www.nature.com/articles/s41550-021-01550-6

  8. Deformation of a rotated granular pile governed by body-force-dependent friction Reviewed

    Terunori Irie, Ryusei Yamaguchi, Sei-ichiro Watanabe, Hiroaki Katsuragi

    Physical Review E   Vol. 104   page: 064902   2021.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevE.104.064902

  9. YORP Effect on Asteroid 162173 Ryugu: Implications for the Dynamical History Reviewed

    Masanori Kanamaru, Sho Sasaki, Tomokatsu Morota, Yuichiro Cho, Eri Tatsumi, Masatoshi Hirabayashi, Naru Hirata, Hiroki Senshu, Yuri Shimaki, Naoya Sakatani, Satoshi Tanaka, Tatsuaki Okada, Tomohiro Usui, Seiji Sugita, Sei-ichiro Watanabe

    JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS   Vol. 126 ( 12 )   2021.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER GEOPHYSICAL UNION  

    Asteroid 162173 Ryugu is a carbonaceous asteroid that was visited by Japan's Hayabusa2 spacecraft in 2018. The formation mechanism of the "spinning-top" shape of Ryugu is a vital clue to the dynamical history of the near-Earth asteroid. In this study, we address the long-term evolution of its spin state induced by the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect, that is, the thermal recoil torque that changes the rotation period and spin-pole direction. Given the current orbit, spin state, and three-dimensional shape of Ryugu observed by Hayabusa2, we computed the YORP torque exerted on Ryugu using a simplified thermal model assuming zero thermal conductivity. Despite variations in the meter-scaled topography, all 20 shape models that we examined indicate that the spin velocity of Ryugu is currently decreasing at a rate of (-6.3 to -0.42) x 10(-6) deg/day(2). Our findings also suggest that the thermal torque is responsible for maintaining the spin pole upright with respect to the orbital plane. Therefore, the YORP effect may explain the significant spin-down from an earlier period of 3.5 hr to the present period of 7.6 hr. The corresponding time scale of the spin-down is estimated to be 0.58-8.7 million years, depending on the input shape models. This time scale is comparable to the formation period of the largest crater, Urashima (5-12 Ma), or the western bulge (2-9 Ma) as derived from previous studies on crater statistics in Ryugu. Thus, its rotation may have started to decelerate as a consequence of major resurfacing events.

    DOI: 10.1029/2021JE006863

    Web of Science

  10. Anomalously porous boulders on (162173) Ryugu as primordial materials from its parent body Reviewed International coauthorship

    N. Sakatani, S. Tanaka, T. Okada, T. Fukuhara, L. Riu, S. Sugita, R. Honda, T. Morota, S. Kameda, Y. Yokota, E. Tatsumi, K. Yumoto, N. Hirata, A. Miura, T. Kouyama, H. Senshu, Y. Shimaki, T. Arai, J. Takita, H. Demura, T. Sekiguchi, T. G. Müller, A. Hagermann, J. Biele, M. Grott, M. Hamm, M. Delbo, W. Neumann, M. Taguchi, Y. Ogawa, T. Matsunaga, T. Wada, S. Hasegawa, J. Helbert, N. Hirata, R. Noguchi, M. Yamada, H. Suzuki, C. Honda, K. Ogawa, M. Hayakawa, K. Yoshioka, M. Matsuoka, Y. Cho, H. Sawada, K. Kitazato, T. Iwata, M. Abe, M. Ohtake, S. Matsuura, K. Matsumoto, H. Noda, Y. Ishihara, K. Yamamoto, A. Higuchi, N. Namiki, G. Ono, T. Saiki, H. Imamura, Y. Takagi, H. Yano, K. Shirai, C. Okamoto, S. Nakazawa, Y. Iijima, M. Arakawa, K. Wada, T. Kadono, K. Ishibashi, F. Terui, S. Kikuchi, T. Yamaguchi, N. Ogawa, Y. Mimasu, K. Yoshikawa, T. Takahashi, Y. Takei, A. Fujii, H. Takeuchi, Y. Yamamoto, C. Hirose, S. Hosoda, O. Mori, T. Shimada, S. Soldini, R. Tsukizaki, M. Ozaki, S. Tachibana, H. Ikeda, M. Ishiguro, H. Yabuta, M. Yoshikawa, S. Watanabe, Y. Tsuda

    Nature Astronomy   Vol. 5 ( 8 ) page: 766 - +   2021.8

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    Planetesimals—the initial stage of the planetary formation process—are considered to be initially very porous aggregates of dusts1,2, and subsequent thermal and compaction processes reduce their porosity3. The Hayabusa2 spacecraft found that boulders on the surface of asteroid (162173) Ryugu have an average porosity of 30–50% (refs. 4–6), higher than meteorites but lower than cometary nuclei7, which are considered to be remnants of the original planetesimals8. Here, using high-resolution thermal and optical imaging of Ryugu’s surface, we discovered, on the floor of fresh small craters (<20 m in diameter), boulders with reflectance (~0.015) lower than the Ryugu average6 and porosity >70%, which is as high as in cometary bodies. The artificial crater formed by Hayabusa2’s impact experiment9 is similar to these craters in size but does not have such high-porosity boulders. Thus, we argue that the observed high porosity is intrinsic and not created by subsequent impact comminution and/or cracking. We propose that these boulders are the least processed material on Ryugu and represent remnants of porous planetesimals that did not undergo a high degree of heating and compaction3. Our multi-instrumental analysis suggests that fragments of the highly porous boulders are mixed within the surface regolith globally, implying that they might be captured within collected samples by touch-down operations10,11.

    DOI: 10.1038/s41550-021-01371-7

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  11. Thermally altered subsurface material of asteroid (162173) Ryugu Reviewed International coauthorship

    K. Kitazato, R. E. Milliken, T. Iwata, M. Abe, M. Ohtake, S. Matsuura, Y. Takagi, T. Nakamura, T. Hiroi, M. Matsuoka, L. Riu, Y. Nakauchi, K. Tsumura, T. Arai, H. Senshu, N. Hirata, M. A. Barucci, R. Brunetto, C. Pilorget, F. Poulet, J.-P. Bibring, D. L. Domingue, F. Vilas, D. Takir, E. Palomba, A. Galiano, D. Perna, T. Osawa, M. Komatsu, A. Nakato, T. Arai, N. Takato, T. Matsunaga, M. Arakawa, T. Saiki, K. Wada, T. Kadono, H. Imamura, H. Yano, K. Shirai, M. Hayakawa, C. Okamoto, H. Sawada, K. Ogawa, Y. Iijima, S. Sugita, R. Honda, T. Morota, S. Kameda, E. Tatsumi, Y. Cho, K. Yoshioka, Y. Yokota, N. Sakatani, M. Yamada, T. Kouyama, H. Suzuki, C. Honda, N. Namiki, T. Mizuno, K. Matsumoto, H. Noda, Y. Ishihara, R. Yamada, K. Yamamoto, F. Yoshida, S. Abe, A. Higuchi, Y. Yamamoto, T. Okada, Y. Shimaki, R. Noguchi, A. Miura, N. Hirata, S. Tachibana, H. Yabuta, M. Ishiguro, H. Ikeda, H. Takeuchi, T. Shimada, O. Mori, S. Hosoda, R. Tsukizaki, S. Soldini, M. Ozaki, F. Terui, N. Ogawa, Y. Mimasu, G. Ono, K. Yoshikawa, C. Hirose, A. Fujii, T. Takahashi, S. Kikuchi, Y. Takei, T. Yamaguchi, S. Nakazawa, S. Tanaka, M. Yoshikawa, S. Watanabe, Y. Tsuda

    Nature Astronomy   Vol. 5 ( 3 ) page: 246 - +   2021.3

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    DOI: 10.1038/s41550-020-01271-2

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    Other Link: http://www.nature.com/articles/s41550-020-01271-2

  12. Characterization of D-Type Spectra Based on Hyperspectral Remote Sensing of the Lunar Surface Reviewed

    Yamamoto Satoru, Watanabe Sei-ichiro

    JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS   Vol. 126 ( 1 )   2021.1

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    DOI: 10.1029/2020JE006669

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  13. Sample collection from asteroid (162173) Ryugu by Hayabusa2: Implications for surface evolution Reviewed International coauthorship

    T. Morota, S. Sugita, Y. Cho, M. Kanamaru, E. Tatsumi, N. Sakatani, R. Honda, N. Hirata, H. Kikuchi, M. Yamada, Y. Yokota, S. Kameda, M. Matsuoka, H. Sawada, C. Honda, T. Kouyama, K. Ogawa, H. Suzuki, K. Yoshioka, M. Hayakawa, N. Hirata, M. Hirabayashi, H. Miyamoto, T. Michikami, T. Hiroi, R. Hemmi, O. S. Barnouin, C. M. Ernst, K. Kitazato, T. Nakamura, L. Riu, H. Senshu, H. Kobayashi, S. Sasaki, G. Komatsu, N. Tanabe, Y. Fujii, T. Irie, M. Suemitsu, N. Takaki, C. Sugimoto, K. Yumoto, M. Ishida, H. Kato, K. Moroi, D. Domingue, P. Michel, C. Pilorget, T. Iwata, M. Abe, M. Ohtake, Y. Nakauchi, K. Tsumura, H. Yabuta, Y. Ishihara, R. Noguchi, K. Matsumoto, A. Miura, N. Namiki, S. Tachibana, M. Arakawa, H. Ikeda, K. Wada, T. Mizuno, C. Hirose, S. Hosoda, O. Mori, T. Shimada, S. Soldini, R. Tsukizaki, H. Yano, M. Ozaki, H. Takeuchi, Y. Yamamoto, T. Okada, Y. Shimaki, K. Shirai, Y. Iijima, H. Noda, S. Kikuchi, T. Yamaguchi, N. Ogawa, G. Ono, Y. Mimasu, K. Yoshikawa, T. Takahashi, Y. Takei, A. Fujii, S. Nakazawa, F. Terui, S. Tanaka, M. Yoshikawa, T. Saiki, S. Watanabe, Y. Tsuda

    Science   Vol. 368 ( 6491 ) page: 654 - +   2020.5

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    © 2020 American Association for the Advancement of Science. All rights reserved. The near-Earth asteroid (162173) Ryugu is thought to be a primitive carbonaceous object that contains hydrated minerals and organic molecules. We report sample collection from Ryugu’s surface by the Hayabusa2 spacecraft on 21 February 2019. Touchdown images and global observations of surface colors are used to investigate the stratigraphy of the surface around the sample location and across Ryugu. Latitudinal color variations suggest the reddening of exposed surface material by solar heating and/or space weathering. Immediately after touchdown, Hayabusa2’s thrusters disturbed dark, fine grains that originate from the redder materials. The stratigraphic relationship between identified craters and the redder material indicates that surface reddening occurred over a short period of time. We suggest that Ryugu previously experienced an orbital excursion near the Sun.

    DOI: 10.1126/science.aaz6306

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  14. An artificial impact on the asteroid (162173) Ryugu formed a crater in the gravity-dominated regime Reviewed International coauthorship

    Arakawa M, Saiki T, Wada K, Ogawa K, Kadono T, Shirai K, Sawada H, Ishibashi K, Honda R, Sakatani N, Iijima Y, Okamoto C, Yano H, Takagi Y, Hayakawa M, Michel P, Jutzi M, Shimaki Y, Kimura S, Mimasu Y, Toda T, Imamura H, Nakazawa S, Hayakawa H, Sugita S, Morota T, Kameda S, Tatsumi E, Cho Y, Yoshioka K, Yokota Y, Matsuoka M, Yamada M, Kouyama T, Honda C, Tsuda Y, Watanabe S, Yoshikawa M, Tanaka S, Terui F, Kikuchi S, Yamaguchi T, Ogawa N, Ono G, Yoshik

    SCIENCE   Vol. 368 ( 6486 ) page: 67 - +   2020.4

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    DOI: 10.1126/science.aaz1701

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  15. Highly porous nature of a primitive asteroid revealed by thermal imaging Reviewed International coauthorship

    Tatsuaki Okada, Tetsuya Fukuhara, Satoshi Tanaka, Makoto Taguchi, Takehiko Arai, Hiroki Senshu, Naoya Sakatani, Yuri Shimaki, Hirohide Demura, Yoshiko Ogawa, Kentaro Suko, Tomohiko Sekiguchi, Toru Kouyama, Jun Takita, Tsuneo Matsunaga, Takeshi Imamura, Takehiko Wada, Sunao Hasegawa, Joern Helbert, Thomas G. Mueller, Axel Hagermann, Jens Biele, Matthias Grott, Maximilian Hamm, Marco Delbo, Naru Hirata, Naoyuki Hirata, Yukio Yamamoto, Seiji Sugita, Noriyuki Namiki, Kohei Kitazato, Masahiko Arakawa, Shogo Tachibana, Hitoshi Ikeda, Masateru Ishiguro, Koji Wada, Chikatoshi Honda, Rie Honda, Yoshiaki Ishihara, Koji Matsumoto, Moe Matsuoka, Tatsuhiro Michikami, Akira Miura, Tomokatsu Morota, Hirotomo Noda, Rina Noguchi, Kazunori Ogawa, Kei Shirai, Eri Tatsumi, Hikaru Yabuta, Yasuhiro Yokota, Manabu Yamada, Masanao Abe, Masahiko Hayakawa, Takahiro Iwata, Masanobu Ozaki, Hajime Yano, Satoshi Hosoda, Osamu Mori, Hirotaka Sawada, Takanobu Shimada, Hiroshi Takeuchi, Ryudo Tsukizaki, Atsushi Fujii, Chikako Hirose, Shota Kikuchi, Yuya Mimasu, Naoko Ogawa, Go Ono, Tadateru Takahashi, Yuto Takei, Tomohiro Yamaguchi, Kent Yoshikawa, Fuyuto Terui, Takanao Saiki, Satoru Nakazawa, Makoto Yoshikawa, Seiichiro Watanabe, Yuichi Tsuda

    NATURE   Vol. 579 ( 7800 ) page: 518 - 522   2020.3

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    Carbonaceous (C-type) asteroids(1) are relics of the early Solar System that have preserved primitive materials since their formation approximately 4.6 billion years ago. They are probably analogues of carbonaceous chondrites(2,3) and are essential for understanding planetary formation processes. However, their physical properties remain poorly known because carbonaceous chondrite meteoroids tend not to survive entry to Earth's atmosphere. Here we report on global one-rotation thermographic images of the C-type asteroid 162173 Ryugu, taken by the thermal infrared imager (TIR)(4) onboard the spacecraft Hayabusa2(5), indicating that the asteroid's boulders and their surroundings have similar temperatures, with a derived thermal inertia of about 300 J m(-2) s(-0.5) K-1 (300 tiu). Contrary to predictions that the surface consists of regolith and dense boulders, this low thermal inertia suggests that the boulders are more porous than typical carbonaceous chondrites(6) and that their surroundings are covered with porous fragments more than 10 centimetres in diameter. Close-up thermal images confirm the presence of such porous fragments and the flat diurnal temperature profiles suggest a strong surface roughness effect(7,8). We also observed in the close-up thermal images boulders that are colder during the day, with thermal inertia exceeding 600 tiu, corresponding to dense boulders similar to typical carbonaceous chondrites(6). These results constrain the formation history of Ryugu: the asteroid must be a rubble pile formed from impact fragments of a parent body with microporosity(9) of approximately 30 to 50 per cent that experienced a low degree of consolidation. The dense boulders might have originated from the consolidated innermost region or they may have an exogenic origin. This high-porosity asteroid may link cosmic fluffy dust to dense celestial bodies(10).Thermal imaging data obtained from the spacecraft Hayabusa2 reveal that the carbonaceous asteroid 162173 Ryugu is an object of unusually high porosity.

    DOI: 10.1038/s41586-020-2102-6

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  16. Hayabusa2 arrives at the carbonaceous asteroid 162173 Ryugu-A spinning top-shaped rubble pile. Reviewed International coauthorship International journal

    S Watanabe, M Hirabayashi, N Hirata, Na Hirata, R Noguchi, Y Shimaki, H Ikeda, E Tatsumi, M Yoshikawa, S Kikuchi, H Yabuta, T Nakamura, S Tachibana, Y Ishihara, T Morota, K Kitazato, N Sakatani, K Matsumoto, K Wada, H Senshu, C Honda, T Michikami, H Takeuchi, T Kouyama, R Honda, S Kameda, T Fuse, H Miyamoto, G Komatsu, S Sugita, T Okada, N Namiki, M Arakawa, M Ishiguro, M Abe, R Gaskell, E Palmer, O S Barnouin, P Michel, A S French, J W McMahon, D J Scheeres, P A Abell, Y Yamamoto, S Tanaka, K Shirai, M Matsuoka, M Yamada, Y Yokota, H Suzuki, K Yoshioka, Y Cho, S Tanaka, N Nishikawa, T Sugiyama, H Kikuchi, R Hemmi, T Yamaguchi, N Ogawa, G Ono, Y Mimasu, K Yoshikawa, T Takahashi, Y Takei, A Fujii, C Hirose, T Iwata, M Hayakawa, S Hosoda, O Mori, H Sawada, T Shimada, S Soldini, H Yano, R Tsukizaki, M Ozaki, Y Iijima, K Ogawa, M Fujimoto, T-M Ho, A Moussi, R Jaumann, J-P Bibring, C Krause, F Terui, T Saiki, S Nakazawa, Y Tsuda

    Science (New York, N.Y.)   Vol. 364 ( 6437 ) page: 268 - +   2019.4

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    The Hayabusa2 spacecraft arrived at the near-Earth carbonaceous asteroid 162173 Ryugu in 2018. We present Hayabusa2 observations of Ryugu's shape, mass, and geomorphology. Ryugu has an oblate "spinning top" shape, with a prominent circular equatorial ridge. Its bulk density, 1.19 ± 0.02 grams per cubic centimeter, indicates a high-porosity (>50%) interior. Large surface boulders suggest a rubble-pile structure. Surface slope analysis shows Ryugu's shape may have been produced from having once spun at twice the current rate. Coupled with the observed global material homogeneity, this suggests that Ryugu was reshaped by centrifugally induced deformation during a period of rapid rotation. From these remote-sensing investigations, we identified a suitable sample collection site on the equatorial ridge.

    DOI: 10.1126/science.aav8032

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  17. The surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy Reviewed International coauthorship

    K. Kitazato, R. E. Milliken, T. Iwata, M. Abe, M. Ohtake, S. Matsuura, T. Arai, Y. Nakauchi, T. Nakamura, M. Matsuoka, H. Senshu, N. Hirata, T. Hiroi, C. Pilorget, R. Brunetto, F. Poulet, L. Riu, J.-P. Bibring, D. Takir, D. L. Domingue, F. Vilas, M. A. Barucci, D. Perna, E. Palomba, A. Galiano, K. Tsumura, T. Osawa, M. Komatsu, A. Nakato, T. Arai, N. Takato, T. Matsunaga, Y. Takagi, K. Matsumoto, T. Kouyama, Y. Yokota, E. Tatsumi, N. Sakatani, Y. Yamamoto, T. Okada, S. Sugita, R. Honda, T. Morota, S. Kameda, H. Sawada, C. Honda, M. Yamada, H. Suzuki, K. Yoshioka, M. Hayakawa, K. Ogawa, Y. Cho, K. Shirai, Y. Shimaki, N. Hirata, A. Yamaguchi, N. Ogawa, F. Terui, T. Yamaguchi, Y. Takei, T. Saiki, S. Nakazawa, S. Tanaka, M. Yoshikawa, S. Watanabe, Y. Tsuda

    Science   Vol. 364 ( 6437 ) page: 272 - +   2019.4

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    The near-Earth asteroid 162173 Ryugu, the target of Hayabusa2 sample return mission, is thought to be a primitive carbonaceous object. We report reflectance spectra of Ryugu’s surface acquired with the Near Infrared Spectrometer (NIRS3) on Hayabusa2, to provide direct measurements of the surface composition and geological context for the returned samples. A weak, narrow absorption feature centered at 2.72 μm was detected across the entire observed surface, indicating that hydroxyl (OH)-bearing minerals are ubiquitous there. The intensity of the OH feature and low albedo are similar to thermally- and/or shock-metamorphosed carbonaceous chondrite meteorites. There are few variations in the OH-band position, consistent with Ryugu being a compositionally homogeneous rubble-pile object, generated from impact fragments of an undifferentiated aqueously altered parent body.

    DOI: 10.1126/science.aav7432

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  18. The geomorphology, color, and thermal properties of Ryugu: Implications for parent-body processes Reviewed International coauthorship

    S. Sugita, R. Honda, T. Morota, S. Kameda, H. Sawada, E. Tatsumi, M. Yamada, C. Honda, Y. Yokota, T. Kouyama, N. Sakatani, K. Ogawa, H. Suzuki, T. Okada, N. Namiki, S. Tanaka, Y. Iijima, K. Yoshioka, M. Hayakawa, Y. Cho, M. Matsuoka, N. Hirata, N. Hirata, H. Miyamoto, D. Domingue, M. Hirabayashi, T. Nakamura, T. Hiroi, T. Michikami, P. Michel, R.-L. Ballouz, O. S. Barnouin, C. M. Ernst, S. E. Schröder, H. Kikuchi, R. Hemmi, G. Komatsu, T. Fukuhara, M. Taguchi, T. Arai, H. Senshu, H. Demura, Y. Ogawa, Y. Shimaki, T. Sekiguchi, T. G. Müller, A. Hagermann, T. Mizuno, H. Noda, K. Matsumoto, R. Yamada, Y. Ishihara, H. Ikeda, H. Araki, K. Yamamoto, S. Abe, F. Yoshida, A. Higuchi, S. Sasaki, S. Oshigami, S. Tsuruta, K. Asari, S. Tazawa, M. Shizugami, J. Kimura, T. Otsubo, H. Yabuta, S. Hasegawa, M. Ishiguro, S. Tachibana, E. Palmer, R. Gaskell, L. Le Corre, R. Jaumann, K. Otto, N. Schmitz, P. A. Abell, M. A. Barucci, M. E. Zolensky, F. Vilas, F. Thuillet, C. Sugimoto, N. Takaki, Y. Suzuki, H. Kamiyoshihara, M. Okada, K. Nagata, M. Fujimoto, M. Yoshikawa, Y. Yamamoto, K. Shirai, R. Noguchi, N. Ogawa, F. Terui, S. Kikuchi, T. Yamaguchi, Y. Oki, Y. Takao, H. Takeuchi, G. Ono, Y. Mimasu, K. Yoshikawa, T. Takahashi, Y. Takei, A. Fujii, C. Hirose, S. Nakazawa, S. Hosoda, O. Mori, T. Shimada, S. Soldini, T. Iwata, M. Abe, H. Yano, R. Tsukizaki, M. Ozaki, K. Nishiyama, T. Saiki, S. Watanabe, Y. Tsuda

    Science   Vol. 364 ( 6437 ) page: 252 - +   2019.4

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    DOI: 10.1126/science.aaw0422

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  19. Space-weathered anorthosite as spectral D-type material on the Martian satellites Reviewed

    S. Yamamoto, S. Watanabe, T. Matsunaga

    Geophysical Research Letters   Vol. 45 ( 3 ) page: 1305-1312   2018.2

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    DOI: 10.1002/2017GL076612

  20. Hayabusa2 Mission Overview Reviewed

    S. Watanabe, Y. Tsuda, M. Yoshikawa, S. Tanaka, T. Saiki, S. Nakazawa

    Space Science Reviews   Vol. 208   page: 3-16   2017.7

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    DOI: 10.1007/s11214-017-0377-1

  21. Thermal waves in irradiated protoplanetary disks Reviewed International coauthorship

    Sei-ichiro Watanabe, D. N. C. Lin

    The Astrophysical Journal   Vol. 672 ( 2 ) page: 1183 - 1195   2008.1

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  22. Rare earth element identification and quantification in millimetre-sized Ryugu rock fragments from the Hayabusa2 space mission International coauthorship

    EARTH PLANETS AND SPACE   Vol. 74 ( 1 )   2022.9

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    DOI: 10.1186/s40623-022-01705-3

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  23. Incorporation of 16O-rich anhydrous silicates in the protolith of highly hydrated asteroid Ryugu International coauthorship

    Ming-Chang Liu, Kaitlyn A. McCain, Nozomi Matsuda, Akira Yamaguchi, Makoto Kimura, Naotaka Tomioka, Motoo Ito, Masayuki Uesugi, Naoya Imae, Naoki Shirai, Takuji Ohigashi, Richard C. Greenwood, Kentaro Uesugi, Aiko Nakato, Kasumi Yogata, Hayato Yuzawa, Yu Kodama, Kaori Hirahara, Ikuya Sakurai, Ikuo Okada, Yuzuru Karouji, Satoru Nakazawa, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Makoto Yoshikawa, Akiko Miyazaki, Masahiro Nishimura, Toru Yada, Masanao Abe, Tomohiro Usui, Sei-ichiro Watanabe, Yuichi Tsuda

    Nature Astronomy     2022.9

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    DOI: 10.1038/s41550-022-01762-4

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    Other Link: https://www.nature.com/articles/s41550-022-01762-4

  24. Presolar Stardust in Asteroid Ryugu International coauthorship

    Barosch Jens, Nittler Larry R., Wang Jianhua, Alexander Conel M. O'D, De Gregorio Bradley T., Engrand Cecile, Kebukawa Yoko, Nagashima Kazuhide, Stroud Rhonda M., Yabuta Hikaru, Abe Yoshinari, Aleon Jerome, Amari Sachiko, Amelin Yuri, Bajo Ken-ichi, Bejach Laure, Bizzarro Martin, Bonal Lydie, Bouvier Audrey, Carlson Richard W., Chaussidon Marc, Choi Byeon-Gak, Cody George D., Dartois Emmanuel, Dauphas Nicolas, Davis Andrew M., Dazzi Alexandre, Deniset-Besseau Ariane, Di Rocco Tommaso, Duprat Jean, Fujiya Wataru, Fukai Ryota, Gautam Ikshu, Haba Makiko K., Hashiguchi Minako, Hibiya Yuki, Hidaka Hiroshi, Homma Hisashi, Hoppe Peter, Huss Gary R., Ichida Kiyohiro, Iizuka Tsuyoshi, Ireland Trevor R., Ishikawa Akira, Ito Motoo, Itoh Shoichi, Kamide Kanami, Kawasaki Noriyuki, Kilcoyne A. L. David, Kita Noriko T., Kitajima Kouki, Kleine Thorsten, Komatani Shintaro, Komatsu Mutsumi, Krot Alexander N., Liu Ming-Chang, Martins Zita, Masuda Yuki, Mathurin Jeremie, McKeegan Kevin D., Montagnac Gilles, Morita Mayu, Mostefaoui Smail, Motomura Kazuko, Moynier Frederic, Nakai Izumi, Nguyen Ann N., Ohigashi Takuji, Okumura Taiga, Onose Morihiko, Pack Andreas, Park Changkun, Piani Laurette, Qin Liping, Quirico Eric, Remusat Laurent, Russell Sara S., Sakamoto Naoya, Sandford Scott A., Schonbachler Maria, Shigenaka Miho, Suga Hiroki, Tafla Lauren, Takahashi Yoshio, Takeichi Yasuo, Tamenori Yusuke, Tang Haolan, Terada Kentaro, Terada Yasuko, Usui Tomohiro, Verdier-Paoletti Maximilien, Wada Sohei, Wadhwa Meenakshi, Wakabayashi Daisuke, Walker Richard J., Yamashita Katsuyuki, Yamashita Shohei, Yin Qing-Zhu, Yokoyama Tetsuya, Yoneda Shigekazu, Young Edward D., Yui Hiroharu, Zhang Ai-Cheng, Abe Masanao, Miyazaki Akiko, Nakato Aiko, Nakazawa Satoru, Nishimura Masahiro, Okada Tatsuaki, Saiki Takanao, Tanaka Satoshi, Terui Fuyuto, Tsuda Yuichi, Watanabe Sei-ichiro, Yada Toru, Yogata Kasumi, Yoshikawa Makoto, Nakamura Tomoki, Naraoka Hiroshi, Noguchi Takaaki, Okazaki Ryuji, Sakamoto Kanako, Tachibana Shogo, Yurimoto Hisayoshi

    ASTROPHYSICAL JOURNAL LETTERS   Vol. 935 ( 1 )   2022.8

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    DOI: 10.3847/2041-8213/ac83bd

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  25. History-dependent deformation of a rotated granular pile governed by granular friction Reviewed

    Irie Terunori, Yamaguchi Ryusei, Watanabe Sei-ichiro, Katsuragi Hiroaki

    ADVANCED POWDER TECHNOLOGY   Vol. 33 ( 8 )   2022.8

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    DOI: 10.1016/j.apt.2022.103629

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  26. Three-axial shape distributions of pebbles, cobbles and boulders smaller than a few meters on asteroid Ryugu Reviewed

    Michikami Tatsuhiro, Hagermann Axel, Morota Tomokatsu, Yokota Yasuhiro, Urakawa Seitaro, Okamura Hiroyuki, Tanabe Naoya, Yumoto Koki, Ebihara Tatsuki, Cho Yuichiro, Ernst Carolyn M., Hayakawa Masahiko, Hirabayashi Masatoshi, Hirata Naru, Honda Chikatoshi, Honda Rie, Kameda Shingo, Kanamaru Masanori, Kikuchi Hiroshi, Kikuchi Shota, Kouyama Toru, Matsuoka Moe, Miyamoto Hideaki, Noguchi Takaaki, Noguchi Rina, Ogawa Kazunori, Okada Tatsuaki, Sakatani Naoya, Sasaki Sho, Sawada Hirotaka, Sugimoto Chiho, Suzuki Hidehiko, Tanaka Satoshi, Tatsumi Eri, Tsuchiyama Akira, Tsuda Yuichi, Watanabe Sei-ichiro, Yamada Manabu, Yoshikawa Makoto, Yoshioka Kazuo, Sugita Seiji

    ICARUS   Vol. 381   2022.7

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    DOI: 10.1016/j.icarus.2022.115007

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  27. NIRS3 spectral analysis of the artificial Omusubi-Kororin crater on Ryugu Reviewed International coauthorship

    Galiano A., Palomba E., Dirri F., Longobardo A., Kitazato K., Iwata T., Matsuoka M., Hiroi T., Takir D., Nakamura T., Abe M., Ohtake M., Matsuura S., Watanabe S., Yoshikawa M., Saiki T., Tanaka S., Okada T., Yamamoto Y., Takei Y., Shirai K., Hirata N., Matsumoto K., Tsuda Y.

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 514 ( 4 ) page: 6173 - 6182   2022.7

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    DOI: 10.1093/mnras/stac1547

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  28. Martian moons exploration MMX: sample return mission to Phobos elucidating formation processes of habitable planets Invited Reviewed International coauthorship

    Kiyoshi Kuramoto, Yasuhiro Kawakatsu, Masaki Fujimoto, Akito Araya, Maria Antonietta Barucci, Hidenori Genda, Naru Hirata, Hitoshi Ikeda, Takeshi Imamura, Jörn Helbert, Shingo Kameda, Masanori Kobayashi, Hiroki Kusano, David J. Lawrence, Koji Matsumoto, Patrick Michel, Hideaki Miyamoto, Tomokatsu Morota, Hiromu Nakagawa, Tomoki Nakamura, Kazunori Ogawa, Hisashi Otake, Masanobu Ozaki, Sara Russell, Sho Sasaki, Hirotaka Sawada, Hiroki Senshu, Shogo Tachibana, Naoki Terada, Stephan Ulamec, Tomohiro Usui, Koji Wada, Sei-ichiro Watanabe, Shoichiro Yokota

    Earth, Planets and Space   Vol. 74 ( 1 )   2022.1

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    Martian moons exploration, MMX, is the new sample return mission planned by the Japan Aerospace Exploration Agency (JAXA) targeting the two Martian moons with the scheduled launch in 2024 and return to the Earth in 2029. The major scientific objectives of this mission are to determine the origin of Phobos and Deimos, to elucidate the early Solar System evolution in terms of volatile delivery across the snow line to the terrestrial planets having habitable surface environments, and to explore the evolutionary processes of both moons and Mars surface environment. To achieve these objectives, during a stay in circum-Martian space over about 3 years MMX will collect samples from Phobos along with close-up observations of this inner moon and carry out multiple flybys of Deimos to make comparative observations of this outer moon. Simultaneously, successive observations of the Martian atmosphere will also be made by utilizing the advantage of quasi-equatorial spacecraft orbits along the moons' orbits.

    DOI: 10.1186/s40623-021-01545-7

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  29. Mission objectives, planning, and achievements of Hayabusa2 Reviewed

    Yuichi Tsuda, Satoru Nakazawa, Makoto Yoshikawa, Takanao Saiki, Fuyuto Terui, Masahiko Arakawa, Masanao Abe, Kohei Kitazato, Seiji Sugita, Shogo Tachibana, Noriyuki Namiki, Satoshi Tanaka, Tatsuaki Okada, Hitoshi Ikeda, Sei-ichiro Watanabe

    Hayabusa2 Asteroid Sample Return Mission     page: 5 - 23   2022

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    DOI: 10.1016/b978-0-323-99731-7.00002-7

  30. Extended mission of Hayabusa2 International coauthorship

    Yuya Mimasu, Shota Kikuchi, Yuto Takei, Takanao Saiki, Sei-ichiro Watanabe, Satoshi Tanaka, Masatoshi Hirabayashi, Naoya Sakatani, Toru Kouyama, Makoto Yoshikawa, Satoru Nakazawa, Yuichi Tsuda

    Hayabusa2 Asteroid Sample Return Mission     page: 557 - 571   2022

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    DOI: 10.1016/b978-0-323-99731-7.00027-1

  31. Landing site selection for the Hayabusa2 mission: Pre-arrival training and post-arrival analyses Reviewed

    Shota Kikuchi, Tomohiro Yamaguchi, Sei-ichiro Watanabe, Hikaru Yabuta, Koji Wada, Takanao Saiki, Yuto Takei, Satoshi Tanaka, Yuichi Tsuda

    Hayabusa2 Asteroid Sample Return Mission     page: 189 - 208   2022

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    DOI: 10.1016/b978-0-323-99731-7.00010-6

  32. MASCOT—A Mobile Lander On-board the Hayabusa2 Spacecraft—Operations on Ryugu Reviewed International coauthorship

    C. Krause, U. Auster, J. P. Bibring, J. Biele, C. Cenac-Morthe, F. Cordero, B. Cozzoni, C. Dudal, D. Embacher, C. Fantinati, H. H. Fischer, K. H. Glassmeier, D. Granena, M. Grott, J. T. Grundmann, V. Hamm, D. Hercik, T. M. Ho, R. Jaumann, K. Kayal, J. Knollenberg, O. Küchemann, C. Lange, L. Lorda, M. Maibaum, D. May, Y. Mimasu, A. Moussi, T. Okada, J. Reill, T. Saiki, K. Sasaki, M. Schlotterer, N. Schmitz, N. Toth, Y. Tsuda, S. Ulamec, T. Yoshimitsu, S. Watanabe, F. Wolff

    Springer Aerospace Technology     page: 559 - 575   2022

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    MASCOT (‘Mobile Asteroid Surface Scout’) is a 10 kg mobile surface science package part of JAXA’s Hayabusa2 sample return mission. The mission was launched in December 2014 from Tanegashima Space Center, Japan. The Hayabusa2 spacecraft reached the target asteroid in summer 2018. After a mapping phase of the asteroid and a landing site selection process the MASCOT lander was deployed to the surface on the 3rd of October 2018. MASCOT operated successfully for about 17 h on the surface of Ryugu. It performed three relocation manoeuvres and one “Mini-Move” and returned 128 MBytes of data. MASCOT has been developed by the German Aerospace Center (DLR) in cooperation with the Centre National d’Etudes Spatiales (CNES). The main objectives were to perform in-situ investigations of the asteroid surface and to support the sampling site selection for the mother spacecraft. These objectives could be reached successfully. On 6th December 2020 Hayabusa2 successfully returned asteroid samples to the Earth.

    DOI: 10.1007/978-3-030-94628-9_25

    Scopus

  33. Measurement of surface deformation and cohesion of a granular pile under the effect of centrifugal force Reviewed

    Irie Terunori, Yamaguchi Ryusei, Watanabe Sei-ichiro, Katsuragi Hiroaki

    MEASUREMENT SCIENCE AND TECHNOLOGY   Vol. 32 ( 12 )   2021.12

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    DOI: 10.1088/1361-6501/ac1b25

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  34. Spectrally blue hydrated parent body of asteroid (162173) Ryugu Reviewed International coauthorship

    Eri Tatsumi, Naoya Sakatani, Lucie Riu, Moe Matsuoka, Rie Honda, Tomokatsu Morota, Shingo Kameda, Tomoki Nakamura, Michael Zolensky, Rosario Brunetto, Takahiro Hiroi, Sho Sasaki, Sei’ichiro Watanabe, Satoshi Tanaka, Jun Takita, Cédric Pilorget, Julia de León, Marcel Popescu, Juan Luis Rizos, Javier Licandro, Ernesto Palomba, Deborah Domingue, Faith Vilas, Humberto Campins, Yuichiro Cho, Kazuo Yoshioka, Hirotaka Sawada, Yasuhiro Yokota, Masahiko Hayakawa, Manabu Yamada, Toru Kouyama, Hidehiko Suzuki, Chikatoshi Honda, Kazunori Ogawa, Kohei Kitazato, Naru Hirata, Naoyuki Hirata, Yuichi Tsuda, Makoto Yoshikawa, Takanao Saiki, Fuyuto Terui, Satoru Nakazawa, Yuto Takei, Hiroshi Takeuchi, Yukio Yamamoto, Tatsuaki Okada, Yuri Shimaki, Kei Shirai, Seiji Sugita

    Nature Communications   Vol. 12 ( 1 )   2021.10

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    <title>Abstract</title>Ryugu is a carbonaceous rubble-pile asteroid visited by the Hayabusa2 spacecraft. Small rubble pile asteroids record the thermal evolution of their much larger parent bodies. However, recent space weathering and/or solar heating create ambiguities between the uppermost layer observable by remote-sensing and the pristine material from the parent body. Hayabusa2 remote-sensing observations find that on the asteroid (162173) Ryugu both north and south pole regions preserve the material least processed by space weathering, which is spectrally blue carbonaceous chondritic material with a 0–3% deep 0.7-µm band absorption, indicative of Fe-bearing phyllosilicates. Here we report that spectrally blue Ryugu’s parent body experienced intensive aqueous alteration and subsequent thermal metamorphism at 570–670 K (300–400 °C), suggesting that Ryugu’s parent body was heated by radioactive decay of short-lived radionuclides possibly because of its early formation 2–2.5 Ma. The samples being brought to Earth by Hayabusa2 will give us our first insights into this epoch in solar system history.

    DOI: 10.1038/s41467-021-26071-8

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    Other Link: https://www.nature.com/articles/s41467-021-26071-8

  35. Magma source transition of lunar mare volcanism at 2.3 Ga Reviewed

    S. Kato, T. Morota, Y. Yamaguchi, S. Watanabe, H. Otake, M. Ohtake

    Meteoritics & Planetary Science     2017.6

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    DOI: 10.1111/maps.12896

  36. Dust ring formation due to sublimation of dust grains: An analytical model Reviewed

    H. Kobayashi, S. Watanabe, H. Kimura, T. Yamamoto

    Icarus   Vol. 201 ( 1 ) page: 395-405   2009.5

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  37. Dust ring formation due to ice sublimation of radially drifting dust particles under the Poynting-Robertson effect in debris disks Reviewed

    Kobayashi, H., Watanabe S., Kimura, H., and Yamamoto T.

    Icarus   Vol. 195 ( 2 ) page: 871-881   2008.6

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  38. Analytic Model of Upper Tropospheric Clouds in Tropical Hadley Cell Reviewed

    Kyoko K. Tanaka, Tetsuo Yamamoto, Sei-ichiro Watanabe, and Kensuke Nakajima

    Earth Planets Space   Vol. 60 ( 3 ) page: 219-228   2008.3

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    We develop a two-dimensional analytic model that describes the behavior of upper tropospheric clouds in the tropical Hadley cell. The behavior of model is characterized by two dimensionless parameters: one is proportional to the temperature lapse rate, and the other is relevant to the initial altitude of the cloud particles. We derive analytic expressions for the motion and evaporation of the cloud particles and calculate various cloud properties such as the cloudiness and the column water content. We find the outflow from the convective regions spreads out and generates a cirrus layer whose converge has a maximum at the tropopause: the cloudiness is as large as 0.5 to 1 in the vicinity of the tropopause for small cloud particles of their radii less than 5 micron.

  39. Co-accretion of the Earth-Moon system after the giant impact Reviewed

    Icarus   Vol. 168   page: 60 - 79   2004

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  40. Gas accretion flows onto giant protoplanets: High-resolution two-dimensional simulations Reviewed

    The Astrophysical Journal   Vol. 580   page: 506 - 518   2002

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  41. Hugoniot equation of state of basalt Reviewed

    Planetary Space Science   Vol. 45 ( 11 ) page: 1489   1997

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  42. Collision and Tidal Interaction between Planetesimals. Reviewed

    Watanabe, S., Miyama, S. M.

    The Astrophysical Journal   Vol. 391   page: 318-335   1992.5

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  43. Cooling and Quasi-Static Contraction of the Primitive Solar Nebula after Gas Accretion Reviewed

    Watanabe, S., Nakagawa, Y., Nakazawa, K.

    The Astrophysical Journal   Vol. 358   page: 282 - 292   1990.7

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  44. Cooling of the Solar Nebula Reviewed

    Watanabe S. Nakagawa, Y.

    Progress of Theoretical Physics Supplement   Vol. 96   page: 130-140   1988.12

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  45. THE RARITY OF SPACE WEATHERED GRAINS FROM RYUGU: REGOLITH ABRASION? Reviewed International coauthorship

    Daly L., Lee M. R., Smith W., McFadzean S., Martin P-E., Bagot P. A. J., Fougerouse D., Saxey D. W., Reddy S., Rickard W. D. A., Noguchi T., Yurimoto H., Nakamura T., Yabuta H., Naraoka H., Okazaki R., Sakamoto K., Tachibana S., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  46. MODAL MINERALOGY OF ASTEROID 162173 RYUGU BY X-RAY DIFFRACTION. Reviewed International coauthorship

    King A. J., Russell S. S., Nakamura T., Yurimoto H., Noguchi T., Okazaki R., Yabuta H., Naraoka H., Sakamoto K., Tachibana S., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  47. NOBLE GAS ISOTOPIC ANALYZES OF THE ASTEROID RYUGU SAMPLES: INITIAL RESULTS OF THE MULTI-STEP PYROLYSIS. Reviewed International coauthorship

    Meshik A., Pravdivtseva O., Okazaki R., Yurimoto H., Nakamura T., Noguchi T., Naraoka H., Yabuta H., Sakamoto K., Tachibana S., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  48. ONE YEAR ON! A SUMMARY OF THE ANALYTICAL WORK ON RYUGU PARTICLES CONDUCTED BY PHASE2 KOCHI CURATION. Reviewed International coauthorship

    Ito M., Tomioka N., Uesugi M., Yamaguchi A., Imae N., Shirai N., Ohigashi T., Kimura M., Liu M-C, Greenwood R. C., Uesugi K., Nakato A., Yogata K., Yuzawa H., Kodama Y., Tsuchiyama A., Yasutake M., Findlay R., Franchi I. A., Malley J. A., McCain K. A., Matsuda N., McKeegan K. D., Hirahara K., Takeuchi A., Sekimoto S., Sakurai I., Okada I., Karouji Y., Yada T., Abe M., Usui T., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  49. RARE EARTH ELEMENT ANALYSIS BY SXRF OF TWO RYUGU ROCK FRAGMENTS COLLECTED DURING THE HAYABUSA2 SPACE MISSION Reviewed International coauthorship

    Tkalcec B. J., Tack P., De Pauw E., Lindner M., Di Michiel M., Bazi B., Vekemans B., Uesugi M., Nakamura T., Matsumoto M., Fujioka Y., Nakashima D., Yurimoto H., Noguchi T., Okazaki R., Yabuta H., Naraoka H., Sakamoto K., Tachibana S., Watanabe S., Tsuda Y., Vincze L., Brenker F. E.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  50. SHOCK-INDUCED DEFORMATION RECORDED IN THE REGOLITH PARTICLES FROM C-TYPE ASTEROID RYUGU. Reviewed International coauthorship

    Kikuiri M., Nakamura T., Langenhorst F., Pollok K., Mikouchi T., Yoshida H., Nakashima D., Zolensky M. E., Uesugi M., Yurimoto H., Noguchi T., Okazaki R., Yabuta H., Naraoka H., Sakamoto K., Tachibana S., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  51. SPECTRAL ANALYSIS OF (162173) RYUGU RETURNED SAMPLE UNDER SIMULATED SPACE VACUUM CONDITIONS Reviewed International coauthorship

    Takir D., Hibbitts C. H., Stockstill-Cahill K. R., Amano K., Matsuoka M., Nakamura T., Yurimoto H., Noguchi T., Okazaki R., Yabuta H., Naraoka H., Sakamoto K., Tachibana S., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  52. UPDATE ON MEASUREMENT OF THE COMPOSITION OF RYUGU FLUID INCLUSIONS Reviewed International coauthorship

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  53. VISIBLE-IR SPECTROSCOPIC DIVERSITY OF RYUGU COARSE GRAINS AND COMPARISON TO SPECTRAL PROPERTIES OF CARBONACEOUS CHONDRITES Reviewed International coauthorship

    Amano K., Matsuoka M., Nakamura T., Kagawa E., Fujioka Y., Potin S. M., Hiroi T., Tatsumi E., Mil-Liken R. E., Brunetto R., Beck P., Takahashi Y., Kawai T., Yamashita S., Uesugi M., Morita T., Kikuiri M., Yurimoto H., Noguchi T., Okazaki R., Yabuta H., Naraoka H., Sakamoto K., Tachibana S., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  54. COMPARISON OF MINERALOGICAL COMPOSITION OF ASTEROID RYUGU SAMPLES RETURNED BY THE HAYABUSA2 MISSION AND ANTARCTIC MICROMETEORITES (AMMs). Reviewed International coauthorship

    Bejach L., Engrand C., Duprat J., Dartois E., Mathurin J., Dazzi A., Deniset-Besseau A., Rividi N., Sandt C., Borondics F., Troadec D., Nakamura T., Morita T., Kikuiri M., Amano K., Kagawa E., Yabuta H., Noguchi T., Yurimoto H., Okazaki R., Naraoka H., Sakamoto K., Tachibana S., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  55. OLIVINE MINERALOGY OF ASTEROID RYUGU SAMPLES AND CI CHONDRITES: FURTHER EVIDENCE FOR THEIR COMMON ORIGIN. Reviewed

    Mikouchi T., Yoshida H., Nakamura T., Zolensky M. E., Nakashima D., Hagiya K., Kikuiri M., Morita T., Amano K., Kagawa E., Yurimoto H., Noguchi T., Okazaki R., Yabuta H., Naraoka H., Sakamoto K., Tachibana S., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  56. INVESTIGATING THE NITROGEN-NOBLE GAS RELATIONSHIP OF ASTEROID RYUGU AND THE LINK TO OTHER CARBONACEOUS CHONDRITES Reviewed International coauthorship

    Broadley M. W., Byrne D. J., Furi E., Marty B., Okazaki R., Yurimoto H., Nakamura T., Noguchi T., Naraoka H., Yabuta H., Sakamoto K., Tachibana S., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  57. 3D MORPHOLOGIES OF MAGNETITE, SULFIDES, CARBONATES AND PHOSPHATES IN RYUGU SAMPLES AND THEIR CRYSTALLIZATION SEQUENCE DURING AQUEOUS ALTERATION. Reviewed

    Tsuchiyama A., Matsumoto M., Matsuno J., Nakamura T., Noguchi T., Yasutake M., Uesugi K., Takeuchi A., Miyake A., Okumura S., Enju S., Mitsukawa I., Fujioka Y., Sun M., Takigawa A., Enokido Y., Kawamoto T., Morita T., Kikuiri M., Amano K., Kagawa E., Matsumoto T., Nakano N., Rubino S., Nakano T., Yurimoto H., Okazaki R., Yabuta H., Naraoka H., Sakamoto K., Tachibana S., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  58. ACQUEOUS ALTERATION PROBED BY MUTLI-ASSEMBLY AND 3D HETEROGENEITY IN SMALL RYUGU FRAGMENTS Reviewed International coauthorship

    Dionnet Z., Aleon-Toppani A., Brunetto R., Rubino S., Nakamura T., Baklouti D., Djouadi Z., Lantz C., Mivumbi O., Borondics F., Heripre E., Troadec D., Tsuchiyama A., Matsuno J., Matsumoto M., Morita T., Kikuiri M., Amano K., Kagawa E., Yurimoto H., Noguchi T., Okazaki R., Yabuta H., Naraoka H., Sakamoto K., Tachibana S., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  59. AN UPDATED OVERVIEW OF MACROMOLECULAR ORGANIC MATTER IN THE C-TYPE ASTEROID RYUGU SAMPLES. Reviewed International coauthorship

    Yabuta H., Cody G. D., Engrand C., Kebukawa Y., De Gregorio B., Bonal L., Remusat L., Stroud R., Quirico E., Nittler L. R., Hashiguchi M., Komatsu M., Dartois E., Mathurin J., Duprat J., Okumura T., Takahashi Y., Takeichi Y., Kilcoyne D., Yamashita S., Dazzi A., Deniset-Besseau A., Sandford S., Mar-Tins Z., Tamenori Y., Ohigashi T., Suga H., Wakabayashi D., Verdier-Paoletti M., Mostefaoui S., Monta-Gnac G., Barosch J., Kamide K., Shigenaka M., Bejach L., Vitale S., Aoki D., Fukushima K., Sugita S., Yumoto K., Sugimoto N., Noguchi T., Yurimoto H., Nakamura T., Okazaki R., Naraoka H., Sakamoto K., Tachibana S., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  60. ANALYSIS OF "STONE" SAMPLES FROM C-TYPE ASTEROID RYUGU. Reviewed International coauthorship

    Nakamura T., Matsumoto M., Amano K., Enokido Y., Zolensky M., Mikouchi T., Genda H., Tanaka S., Zolotov Y., Kurosawa K., Wakita S., Hyodo R., Nagano H., Nakashima D., Takahashi Y., Fujioka Y., Kikuiri M., Kagawa E., Matsuoka M., Brearley A. J., Tsuchiyama A., Uesugi M., Matsuno J., Kimura Y., Sato M., Milliken R. E., Tatsumi E., Sugita S., Hiroi T., Kitazato K., Brownlee D., Joswiak D. J., Takahashi M., Ninomiya K., Takahashi T., Osawa T., Terada K., Brenker F. E., Tkalcec B. J., Vincze L., Brunetto R., Aleon-Toppani A., Chan Q., Roskosz M., Viennet J. -C., Beck P., Alp E., Michikami I., Nagaashi Y., Tsuji T., Ino Y., Martinez J., Han J., Dolocan A., Bodnar R. J., Tanaka M., Yoshida H., Sugiyama K., King A. J., Fukushi K., Suga H., Yamashita S., Kawai T., Inoue K., Nakato A., Noguchi T., Vilas F., Hendrix A. R., Jaramillo C., Domingue D. L., Dominguez G., Gainsforth Z., Engrand C., Duprat J., Russell S. S., Bonato E., Ma C., Kawamoto T., Yurimoto H., Okazaki R., Naraoka H., Sakamoto K., Tachibana S., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  61. INITIAL ANALYSIS ACTIVITY OF HAYABUSA2-RETURNED SAMPLES FROM C-TYPE NEAR-EARTH ASTEROID (162173) RYUGU. Reviewed

    Tachibana S., Yurimoto H., Nakamura T., Noguchi T., Okazaki R., Yabuta H., Naraoka H., Sakamoto K., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 57   2022.8

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  62. Hayabusa2 Pinpoint Touchdown near the Artificial Crater on Ryugu: Trajectory Design and Guidance Performance Reviewed

    Shota Kikuchi, Takanao Saiki, Yuto Takei, Fuyuto Terui, Naoko Ogawa, Yuya Mimasu, Go Ono, Kent Yoshikawa, Hirotaka Sawada, Hiroshi Takeuchi, Hitoshi Ikeda, Atsushi Fujii, eiji Sugita, Tomokatsu Morota, Manabu Yamada, Rie Honda, Yasuhiro Yokota, Naoya Sakatani, Shingo Kameda, Toru Kouyama, Naru Hirata, Naoyuki Hirata, Kei Shirai, Kohei Kitazato, Satoru Nakazawa, Makoto Yoshikawa, Satoshi Tanaka, Koji Wada, Sei-ichiro Watanabe, Yuichi Tsuda

    Advances in Space Research   Vol. 68 ( 8 ) page: 3093 - 3140   2021.10

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    DOI: 10.1016/j.asr.2021.07.031

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  63. SPH simulations for shape deformation of rubble-pile asteroids through spinup: The challenge for making top-shaped asteroids Ryugu and Bennu Reviewed

    Keisuke Sugiura, Hiroshi Kobayashi, Sei-ichiro Watanabe, Hidenori Genda, Ryuki Hyodo, Shu-ichiro Inutsuka

    ICARUS   Vol. 365   page: 114505   2021.9

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    Asteroid 162173 Ryugu and asteroid 101955 Bennu, which were recently visited by spacecraft Hayabusa2 and OSIRIS-REx, respectively, are spinning top-shaped rubble piles. Other axisymmetric top-shaped near-Earth asteroids have been observed with ground-based radar, most of which rotate near breakup rotation periods of similar to 3 h. This suggests that rotation-induced deformation of asteroids through rotational spinup produces top shapes. Although some previous simulations using the Discrete Element Method showed that spinup of rubble piles may produce oblate top shapes, it is still unclear what kinds of conditions such as friction angles of constituent materials and spinup timescales are required for top-shape formation. Here we show, through Smoothed Particle Hydrodynamics simulations of granular bodies spinning-up at different rates, that the rotation-induced deformation of spherical rubble piles before breakup can be classified into three modes according to the friction angle phi(d) : quasi-static and internal deformation for phi(d) <= 40 degrees, dynamical and internal deformation for 50 degrees <= phi(d) <= 60 degrees , and a set of surface landslides for phi(d) >= 70 degrees. Note that these apparent large values of friction angle can be acceptable if we consider the effect of cohesion among blocks of a rubble pile under weak gravity. Bodies with phi(d) <= 60 degrees evolve into oblate spheroids through internal deformation, but never form pronounced equators defining a top shape. In contrast, bodies with phi(d) >= 70 degrees deform into axisymmetric top shapes through an axisymmetric set of surface landslides if spinup timescales are less than or similar to a few days. In addition, through slow spinups with timescales greater than or similar to 1 month, bodies with phi(d) >= 70 degrees deform into non-axisymmetric shapes via localized sets of landslides. We suggest that rapid spinup mechanisms are preferable for the formation of axisymmetric top shapes.

    DOI: 10.1016/j.icarus.2021.114505

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  64. Rotational states and shapes of Ryugu and Bennu: Implications for interior structure and strength Reviewed

    PLANETARY AND SPACE SCIENCE   Vol. 204   2021.9

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    DOI: 10.1016/j.pss.2021.105268

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  65. Hayabusa2 extended mission: New voyage to rendezvous with a small asteroid rotating with a short period Reviewed International coauthorship

    M. Hirabayashi, Y. Mimasu, N. Sakatani, S. Watanabe, Y. Tsuda, T. Saiki, S. Kikuchi, T. Kouyama, M. Yoshikawa, S. Tanaka, S. Nakazawa, Y. Takei, F. Terui, H. Takeuchi, A. Fujii, T. Iwata, K. Tsumura, S. Matsuura, Y. Shimaki, S. Urakawa, Y. Ishibashi, S. Hasegawa, M. Ishiguro, D. Kuroda, S. Okumura, S. Sugita, T. Okada, S. Kameda, S. Kamata, A. Higuchi, H. Senshu, H. Noda, K. Matsumoto, R. Suetsugu, T. Hirai, K. Kitazato, D. Farnocchia, S.P. Naidu, D.J. Tholen, C.W. Hergenrother, R.J. Whiteley, N.A. Moskovitz, P.A. Abell

    Advances in Space Research   Vol. 68 ( 3 ) page: 1533 - 1555   2021.8

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    DOI: 10.1016/j.asr.2021.03.030

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  66. FIRST NIR HYPER-SPECTRAL IMAGING OF HAYABUSA2 RETURNED SAMPLES BY THE MICROMEGA MICROSCOPE WITHIN THE ISAS CURATION FACILITY Reviewed International coauthorship

    Bibring J. P., Pilorget C., Okada T., Hamm V., Brunetto R., Yada T., Loizeau D., Riu L., Usui T., Moussi-Soffys A., Hatakeda K., Nakato A., Yogata K., Abe M., Aleon-Toppani A., Carter J., Chaigneau M., Crane B., Gondet B., Kumagai K., Langevin Y., Lantz C., Le Pivert-Jolivet T., Lequertier G., Lourit L., Miyazaki A., Nishimura M., Poulet F., Arakawa M., Hirata N., Kitazato K., Nakazawa S., Namiki N., Saiki T., Sugita S., Tachibana S., Tanaka S., Yoshikawa M., Tsuda Y., Watanabe S.

    METEORITICS & PLANETARY SCIENCE   Vol. 56   2021.8

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  67. INITIAL DESCRIPTIONS OF ASTEROID RYUGU SAMPLES RETURNED BY HAYABUSA2. Reviewed International coauthorship

    Yada T., Abe M., Nakato A., Yogata K., Miyazaki A., Kumagai K., Hatakeda K., Okada T., Nishimura M., Furuya S., Yoshitake M., Iwamae A., Soejima H., Hitomi Y., Riu L., Lourit L., Pilorget C., Hamm V., Brunetto R., Bibring J. -P., Cho Y., Yumoto K., Yabe Y., Sugita S., Tachibana S., Sawada H., Sakamoto K., Hayashi T., Yamamoto D., Fukai R., Sugahara H., Yurimoto H., Usui T., Watanabe S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 56   2021.8

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  68. Ryugu: A brand-new planetary sample returned from a C-type asteroid

    Toru Yada, Masanao Abe, Tatsuaki Okada, Aiko Nakato, Kasumi Yogata, Akiko Miyazaki, Kentaro Hatakeda, Kazuya Kumagai, Masahiro Nishimura, Yuya Hitomi, Hiromichi Soejima, Miwa Yoshitake, Ayako Iwamae, Shizuho Furuya, Masayuki Uesugi, Yuzuru Karouji, Tomohiro Usui, Tasuku Hayashi, Daiki Yamamoto, Ryota Fukai, Seiji Sugita, Yuichiro Cho, Koki Yumoto, Yuna Yabe, Jean-Pierre Bibring, Cedric Pilorget, Vincent Hamm, Rosario Brunetto, Lucie Riu, Lionel Lourit, Damien Loizeau, Guillaume Lequertier, Aurelie Moussi-Soffys, Shogo Tachibana, Hirotaka Sawada, Ryuji Okazaki, Yoshinori Takano, Kanako Sakamoto, Yayoi Miura, Hajime Yano, Trevor Ireland, Tetsuya Yamada, Masaki Fujimoto, Kohei Kitazato, Noriyuki Namiki, Masahiko Arakawa, Naru Hirata, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Hikaru Yabuta, Hiroshi Naraoka, Motoo Ito, Eizo Nakamura, Kentaro Uesugi, Katsura Kobayashi, Tatsuhiro Michikami, Hiroshi Kikuchi, Naoyuki Hirata, Yoshiaki Ishihara, Koji Matsumoto, Hirotomo Noda, Rina Noguchi, Yuri Shimaki, Kazunori Ogawa, Kei Shirai, Koji Wada, Hiroki Senshu, Yukio Yamamoto, Tomokatsu Morota, Rie Honda, Chikatoshi Honda, Yasuhiro Yokota, Moe Matsuoka, Naoya Sakatani, Eri Tatsumi, Akira Miura, Manabu Yamada, Atsushi Fujii, Chikako Hirose, Satoshi Hosoda, Hitoshi Ikeda, Takahiro Iwata, Shota Kikuchi, Yuya Mimasu, Osamu Mori, Naoko Ogawa, Go Ono, Takanobu Shimada, Stefania Soldini, Tadateru Takahashi, Yuto Takei, Hiroshi Takeuchi, Ryudo Tsukizaki, Kent Yoshikawa, Fuyuto Terui, Satoru Nakazawa, Satoshi Tanaka, Takanao Saiki, Makoto Yoshikawa, Sei-ichiro Watanabe, Yuichi Tsuda

        2021.6

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    <title>Abstract</title>
    C-type asteroids are considered to be primitive small Solar-System bodies enriched in water and organics, providing clues for understanding the origin and evolution of the Solar System and the building blocks of life. C-type asteroid 162173 Ryugu has been characterized by remote sensing and on-asteroid measurements with Hayabusa2, but further studies are expected by direct analyses of returned samples. Here we describe the bulk sample mainly consisting of rugged and smooth particles of millimeter to submillimeter size, preserving physical and chemical properties as they were on the asteroid. The particle size distribution is found steeper than that of surface boulders11. Estimated grain densities of the samples have a peak around 1350 kg m-3, which is lower than that of meteorites suggests a high micro-porosity down to millimeter-scale, as estimated at centimeter-scale by thermal measurements. The extremely dark optical to near-infrared reflectance and the spectral profile with weak absorptions at 2.7 and 3.4 microns implying carbonaceous composition with indigenous aqueous alteration, respectively, match the global average of Ryugu, confirming the sample’s representativeness. Together with the absence of chondrule and Ca-Al-rich inclusion of larger than sub-mm, these features indicate Ryugu is most similar to CI chondrites but with darker, more porous and fragile characteristics.

    DOI: 10.21203/rs.3.rs-608561/v1

    Other Link: https://www.researchsquare.com/article/rs-608561/v1.html

  69. Ballistic deployment of the Hayabusa2 artificial landmarks in the microgravity environment of Ryugu Reviewed International coauthorship

    Shota Kikuchi, Naoko Ogawa, Osamu Mori, Takanao Saiki, Yuto Takei, Fuyuto Terui, Go Ono, Yuya Mimasu, Kent Yoshikawa, Stefaan Van Wal, Hiroshi Takeuchi, Hitoshi Ikeda, Atsushi Fujii, Yuki Takao, Tetsuya Kusumoto, Naru Hirata, Naoyuki Hirata, Kei Shirai, Toru Kouyama, Shingo Kameda, Manabu Yamada, Satoru Nakazawa, Makoto Yoshikawa, Satoshi Tanaka, Seiji Sugita, Sei-ichiro Watanabe, Yuichi Tsuda

    Icarus   Vol. 358   page: 114220 - 114220   2021.4

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    DOI: 10.1016/j.icarus.2020.114220

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  70. Alignment determination of the Hayabusa2 laser altimeter (LIDAR)

    Noda Hirotomo, Senshu Hiroki, Matsumoto Koji, Namiki Noriyuki, Mizuno Takahide, Sugita Seiji, Abe Shinsuke, Araki Hiroshi, Asari Kazuyoshi, Cho Yuichiro, Fujii Atsushi, Hayakawa Masahiko, Higuchi Arika, Hirata Naoyuki, Hirata Naru, Honda Chikatoshi, Honda Rie, Ishihara Yoshiaki, Kameda Shingo, Kikuchi Shota, Kouyama Toru, Matsuoka Moe, Mimasu Yuya, Morota Tomokatsu, Nakazawa Satoru, Ogawa Kazunori, Ogawa Naoko, Ono Go, Oshigami Shoko, Saiki Takanao, Sakatani Naoya, Sasaki Sho, Sawada Hirotaka, Shizugami Makoto, Suzuki Hidehiko, Takahashi Tadateru, Takei Yuto, Tanaka Satoshi, Tatsumi Eri, Terui Fuyuto, Tsuda Yuichi, Tsuruta Seiitsu, Watanabe Sei-ichiro, Yamada Manabu, Yamada Ryuhei, Yamaguchi Tomohiro, Yamamoto Keiko, Yokota Yasuhiro, Yoshida Fumi, Yoshikawa Kent, Yoshikawa Makoto, Yoshioka Kazuo

    EARTH PLANETS AND SPACE   Vol. 73 ( 1 )   2021.1

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  71. Crater depth-to-diameter ratios on asteroid 162173 Ryugu Reviewed

    Rina Noguchi, Naoyuki Hirata, Naru Hirata, Yuri Shimaki, Naoki Nishikawa, Sayuri Tanaka, Takaaki Sugiyama, Tomokatsu Morota, Seiji Sugita, Yuichiro Cho, Rie Honda, Shingo Kameda, Eri Tatsumi, Kazuo Yoshioka, Hirotaka Sawada, Yasuhiro Yokota, Naoya Sakatani, Masahiko Hayakawa, Moe Matsuoka, Manabu Yamada, Toru Kouyama, Hidehiko Suzuki, Chikatoshi Honda, Kazunori Ogawa, Masanori Kanamaru, Sei-ichiro Watanabe

    Icarus   Vol. 354 ( 15 ) page: 114016 - 114016   2021.1

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    DOI: 10.1016/j.icarus.2020.114016

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  72. Rotational effect as the possible cause of the east-west asymmetric crater rims on Ryugu observed by LIDAR data Reviewed

    Naoyuki Hirata, Noriyuki Namiki, Fumi Yoshida, Koji Matsumoto, Hirotomo Noda, Hiroki Senshu, Takahide Mizuno, Fuyuto Terui, Yoshiaki Ishihara, Ryuhei Yamada, Keiko Yamamoto, Sinsuke Abe, Rina Noguchi, Naru Hirata, Yuichi Tsuda, Sei-ichiro Watanabe

    Icarus   Vol. 354   page: 114073 - 114073   2021.1

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    DOI: 10.1016/j.icarus.2020.114073

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  73. Collisional history of Ryugu’s parent body from bright surface boulders Reviewed International coauthorship

    E. Tatsumi, C. Sugimoto, L. Riu, S. Sugita, T. Nakamura, T. Hiroi, T. Morota, M. Popescu, T. Michikami, K. Kitazato, M. Matsuoka, S. Kameda, R. Honda, M. Yamada, N. Sakatani, T. Kouyama, Y. Yokota, C. Honda, H. Suzuki, Y. Cho, K. Ogawa, M. Hayakawa, H. Sawada, K. Yoshioka, C. Pilorget, M. Ishida, D. Domingue, N. Hirata, S. Sasaki, J. de León, M. A. Barucci, P. Michel, M. Suemitsu, T. Saiki, S. Tanaka, F. Terui, S. Nakazawa, S. Kikuchi, T. Yamaguchi, N. Ogawa, G. Ono, Y. Mimasu, K. Yoshikawa, T. Takahashi, Y. Takei, A. Fujii, Y. Yamamoto, T. Okada, C. Hirose, S. Hosoda, O. Mori, T. Shimada, S. Soldini, R. Tsukizaki, T. Mizuno, T. Iwata, H. Yano, M. Ozaki, M. Abe, M. Ohtake, N. Namiki, S. Tachibana, M. Arakawa, H. Ikeda, M. Ishiguro, K. Wada, H. Yabuta, H. Takeuchi, Y. Shimaki, K. Shirai, N. Hirata, Y. Iijima, Y. Tsuda, S. Watanabe, M. Yoshikawa

    Nature Astronomy   Vol. 5 ( 1 ) page: 39 - 45   2021.1

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    DOI: 10.1038/s41550-020-1179-z

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    Other Link: http://www.nature.com/articles/s41550-020-1179-z

  74. Thermophysical Properties of C-Type Asteroid 162173 Ryugu Revealed by the Thermal Infrared Imager TIR on Hayabusa2

    Tatsuaki OKADA, Tetsuya FUKUHARA, Satoshi TANAKA, Makoto TAGUCHI, Takehiko ARAI, Hiroki SENSHU, Naoya SAKATANI, Yuri SHIMAKI, Hirohide DEMURA, Yoshiko OGAWA, Kohei KITAZATO, Kentaro SUKO, Tomohiko SEKIGUCHI, Toru KOUYAMA, Jun TAKITA, Tsuneo MATSUNAGA, Takeshi IMAMURA, Takehiko WADA, Sunao HASEGAWA, Jorn HELBERT, Thomas G. MUELLER, Axel HAGERMANN, Jens BIELE, Matthias GROTT, Maximilian HAMM, Marco DELBO, Naru HIRATA, Naoyuki HIRATA, Yukio YAMAMOTO, Fuyuto TERUI, Takanao SAIKI, Satoru NAKAZAWA, Makoto YOSHIKAWA, Seiichiro WATANABE, Yuichi TSUDA

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN   Vol. 19 ( 5 ) page: 654 - 659   2021

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society for Aeronautical and Space Sciences  

    DOI: 10.2322/tastj.19.654

  75. Spin-driven evolution of asteroids' top-shapes at fast and slow spins seen from (101955) Bennu and (162173) Ryugu Reviewed International coauthorship

    Hirabayashi Masatoshi, Nakano Ryota, Tatsumi Eri, Walsh Kevin J, Barnouin Olivier S, Michel Patrick, Hartzell Christine M, Britt Daniel T, Sugita Seiji, Watanabe Sei-ichiro, Bottke William F, Scheeres Daniel J, Ballouz Ronald-Louis, Cho Yuichiro, Morota Tomokatsu, Howell Ellen S, Lauretta Dante S

    ICARUS   Vol. 352   2020.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.icarus.2020.113946

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  76. Motion reconstruction of the small carry-on impactor aboard Hayabusa2

    Takanao Saiki, Yuya Mimasu, Yuto Takei, Manabu Yamada, Hirotaka Sawada, Kazunori Ogawa, Naoko Ogawa, Hiroshi Takeuchi, Akira Miura, Yuri Shimaki, Koji Wada, Rie Honda, Yasuhiro Yokota, Kei Shirai, Naruhisa Sano, Hirohito Ohtsuka, Go Ono, Kent Yoshikawa, Shota Kikuchi, Chikako Hirose, Yukio Yamamoto, Takahiro Iwata, Masahiko Arakawa, Seiji Sugita, Satoshi Tanaka, Fuyuto Terui, Makoto Yoshikawa, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

    Astrodynamics   Vol. 4 ( 4 ) page: 289 - 308   2020.12

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    DOI: 10.1007/s42064-020-0077-6

    Other Link: http://link.springer.com/article/10.1007/s42064-020-0077-6/fulltext.html

  77. Characterization of the Ryugu surface by means of the variability of the near-infrared spectral slope in NIRS3 data Reviewed International coauthorship

    Galiano A, Palomba E, D'Amore M, Zinzi A, Dirri F, Longobardo A, Kitazato K, Iwata T, Matsuoka M, Hiroi T, Takir D, Nakamura T, Abe M, Ohtake M, Matsuura S, Watanabe S, Yoshikawa M, Saiki T, Tanaka S, Okada T, Yamamoto Y, Takei Y, Shirai K, Hirata N, Matsumoto K, Tsuda Y

    ICARUS   Vol. 351   page: 113959 - 113959   2020.11

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    DOI: 10.1016/j.icarus.2020.113959

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  78. Hayabusa2 Landing Site Selection: Surface Topography of Ryugu and Touchdown Safety Reviewed International coauthorship

    Shota Kikuchi, Sei-ichiro Watanabe, Takanao Saiki, Hikaru Yabuta, Seiji Sugita, Tomokatsu Morota, Naru Hirata, Naoyuki Hirata, Tatsuhiro Michikami, Chikatoshi Honda, Yashuhiro Yokota, Rie Honda, Naoya Sakatani, Tatsuaki Okada, Yuri Shimaki, Koji Matsumoto, Rina Noguchi, Yuto Takei, Fuyuto Terui, Naoko Ogawa, Kent Yoshikawa, Go Ono, Yuya Mimasu, Hirotaka Sawada, Hitoshi Ikeda, Chikako Hirose, Tadateru Takahashi, Atsushi Fujii, Tomohiro Yamaguchi, Yoshiaki Ishihara, Tomoki Nakamura, Kohei Kitazato, Koji Wada, Shogo Tachibana, Eri Tatsumi, Moe Matsuoka, Hiroki Senshu, Shingo Kameda, Toru Kouyama, Manabu Yamada, Kei Shirai, Yuichiro Cho, Kazunori Ogawa, Yukio Yamamoto, Akira Miura, Takahiro Iwata, Noriyuki Namiki, Masahiko Hayakawa, Masanao Abe, Satoshi Tanaka, Makoto Yoshikawa, Satoru Nakazawa, Yuichi Tsuda

    Space Science Reviews   Vol. 216 ( 7 ) page: 116   2020.10

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    DOI: 10.1007/s11214-020-00737-z

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    Other Link: http://link.springer.com/article/10.1007/s11214-020-00737-z/fulltext.html

  79. Mission Status of Hayabusa2, Science Highlights, and Outlook for Sample Analyses

    Seiji Sugita, Rie Honda, Tomokatsu Morota, Shingo Kameda, Eri Tatsumi, Shogo Tachibana, Kohei Kitazato, Tatsuaki Okada, Noriyuki Namiki, Masahiko Arakawa, Patrick Michel, Deborah Domingue, Satoshi Tanaka, Makoto Yoshikawa, Sei-ichiro Watanabe, Yuichi Tsuda

        2020.10

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    Publisher:Copernicus GmbH  

    &amp;lt;p&amp;gt;JAXA&amp;amp;#8217;s Hayabusa2 is a sample-return mission was launched on Dec. 3, 2014 for bringing back first samples from a C-complex asteroid [1,2]. It arrived at asteroid Ryugu on June 27, 2018 and left for Earth on Nov. 13, 2019 after conducting global remote-sensing observations, two touchdown sampling operations, rover deployments, and an artificial impact experiment. We review our science results and update the mission status of Hayabusa2 in this presentation.&amp;amp;#160;&amp;lt;/p&amp;gt;
    &amp;lt;p&amp;gt;The global observations revealed that Ryugu has a top-shaped body with very low density (1.19&amp;amp;#177;0.02 g/cc) [3], spatially uniform Cb-type spectra without strong Fe-rich serpentine absorption at 0.7-um [4], and a weak but significant OH absorption at 2.7 um [5]. Based on these observations, we proposed that Ryugu materials may have experienced aqueous alteration and subsequent thermal metamorphism due to radiogenic heating [4]. However, other scenarios, such as impact-induced thermal metamorphism and extremely primitive carbonaceous materials before extensive alteration, were also considered because there were many new properties of Ryugu whose origins are unclear. Also, numerical calculations show that impact heating can raise the temperatures high enough to dehydrate serpentine at typical collision speed in the asteroid main belt [6]. &amp;amp;#160;&amp;lt;/p&amp;gt;
    &amp;lt;p&amp;gt;Further analysis using high-resolution data obtained at low-altitude descents for both rehearsal and actual touchdown operations as well as the artificial impact experiment by small carryon impactor (SCI) and landers observations the Ryugu surface on allowed us to find out what caused the properties of Ryugu. For example, subtle but distinct latitudinal variation of spectral slope in optical wavelengths found in the initial observations [4] turned out be caused by solar heating or space weathering during orbital excursion toward the Sun and subsequent erosion of the equatorial ridge owing to slowdown in Ryugu&amp;amp;#8217;s spin rate [7]. The SCI impact created a very large (~17 m in crest diameter) crater consistent with gravity-controlled scaling showing that Ryugu surface has very low intra-boulder cohesion and the Ryugu surface is very young and well mixed [8].&amp;lt;/p&amp;gt;
    &amp;lt;p&amp;gt;Furthermore, the MASCOT lander also showed that typical boulders on Ryugu is not covered with a layer of fine regolith [9] and yet possess very low thermal inertia (282+93/-35 MKS) consistent with highly porous structure [10]. This value is consistent with the global values or Ryugu [4, 11], suggesting that the vast majority of boulders on Ryugu are very porous. However, thermal infrared imager (TIR) also found that Ryugu has a number of &amp;amp;#8220;dense boulders&amp;amp;#8221; with high thermal inertia (&amp;gt;600 MKS) consistent with typical carbonaceous chondrites, showing that Ryugu&amp;amp;#8217;s parent body must have had a large enough gravity and pressure to compress the constituent materials [11]. This observation supports that Ryugu originated from a large parent body, such as proto-Polana and proto-Eulalia, which are estimated to be ~100 km in diameter.&amp;lt;/p&amp;gt;
    &amp;lt;p&amp;gt;Some of the dense boulders were also covered by multi-band images of optical navigation camera (ONC-T) and turned out to have C-type spectra with albedos much higher than the Ryugu average [12]. These spectra and albedos are similar to carbonaceous chondrites heated at low temperatures. Although the total mass of these high-albedo boulders on Ryugu is estimated to be very small (&amp;lt; 1%), the spectral and albedo varieties are much greater than the bulk Ryugu surface and approximately follow the dehydration track of carbonaceous chondrites [12]. These spectral match supports that Ryugu materials experienced aqueous alteration and subsequent thermal metamorphism. The dominance of a high-temperature component and scarcity of lower temperature components are consistent with radiogenic heating in a relatively large parent body because large bodies would have only thin low-temperature thermal skin and large volume of high-temperature interior.&amp;amp;#160;&amp;lt;/p&amp;gt;
    &amp;lt;p&amp;gt;If radiogenic heating is really responsible for Ryugu&amp;amp;#8217;s moderate dehydration, this may place a very important constraint on the timing of the formation of Ryugu&amp;amp;#8217;s parent body. Because the radiogenic heat source for most meteorite parent bodies are likely extinct species, such as 26Al, the peak temperature is chiefly controlled by the timing of accretion [13]. Thus, high metamorphism temperatures (several hundred degrees in Celsius) of Ryugu&amp;amp;#8217;s bulk materials inferred from spectral comparison with laboratory heated CM and CI meteorites [4, 12] require Ryugu&amp;amp;#8217;s parent body formed early in the Solar System. Because Ryugu&amp;amp;#8217;s parent body contained substantial amount of water at the time of formation, it must have been formed outside the snowline. Thus, the birth place of Ryugu&amp;amp;#8217;s parent body would be a high-accretion-rate location outside the snowline.&amp;lt;/p&amp;gt;
    &amp;lt;p&amp;gt;Recent high-precision measurements of stable isotopes of meteorites have found that there is a major dichotomy between carbonaceous chondrites (CCs) and some iron meteorites, which formed outside Jupiter&amp;amp;#8217;s orbit, and non-carbonaceous meteorites (NCs), which formed inside Jupiter&amp;amp;#8217;s orbit [e.g., 14]. If Ryugu belongs to CCs, then Ryugu materials could be form near Jupiter, where accretion could occur early. Thus, measurements of stable isotopes of elements, such as Cr, Ti and Mo, of Ryugu samples to be returned to Earth by the end of 2020 would be highly valuable for constraining the original locations of Polana or Eulalia, among the largest C-complex asteroids in the inner main belt.&amp;amp;#160;&amp;lt;/p&amp;gt;
    &amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Acknowledgements:&amp;lt;/strong&amp;gt; This study was supported by JSPS Core-to-Core program &amp;amp;#8220;International Network of Planetary Sciences&amp;amp;#8221;, CNES, and Univ. Co?te d&amp;amp;#8217;Azur.&amp;amp;#160;&amp;lt;/p&amp;gt;
    &amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;References:&amp;lt;/strong&amp;gt;&amp;amp;#160; [1] Watanabe et al., SSR, 208, 3-16, 2017. [2] Tsuda et at., Acta Astronaut. 91, 356-363, 2013. [3] Watanabe et al., Science, 364, 268-272, 2019. [4] Sugita et al., Science, 364, eaaw0422, 2019. [5] Kitazato et al., Science, 364, 272-275, 2019. [6] Michel et al., Nature Comm., 11, 5184, 2020. [7] Morota et al., Science, 368, 654-659, 2020. [8] Akarawa et al. Science, 368, 67-671, 2020. [9] Jaumann et al. Science, 365, 817-820, 2019.&amp;amp;#160; [10] Grott et al., Nature Astron. 3, 971-976, 2019.&amp;amp;#160; [11] Okada et al., Nature, 579, 518-522, 2020. [12] Sugimoto et al. 51st LPSC, #1770, 2020.&amp;amp;#160; [13] Grimm and McSween, Science, 259, 653-655, 1993.&amp;amp;#160; [14] Kruijer et al., PNAS, 114, 6712-6716, 2017.&amp;amp;#160;&amp;lt;/p&amp;gt;

    DOI: 10.5194/epsc2020-995

  80. Hayabusa2's kinetic impact experiment: Operational planning and results Reviewed

    Saiki Takanao, Takei Yuto, Mimasu Yuya, Sawada Hirotaka, Ogawa Naoko, Ono Go, Yoshikawa Kent, Terui Fuyuto, Arakawa Masahiko, Sugita Seiji, Watanabe Sei-ichiro, Yoshikawa Makoto, Nakazawa Satoru, Tsuda Yuichi

    ACTA ASTRONAUTICA   Vol. 175   page: 362 - 374   2020.10

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    Hayabusa2 is a Japanese interplanetary probe launched on December 3, 2014, which arrived at asteroid Ryugu on June 27, 2018. During its stay around Ryugu, it completed several challenging operations, including deploying two rovers and a lander, conducing two sample collections, and performing a kinetic impact experiment. The kinetic impact experiment was one of the biggest challenges of the Hayabusa2 mission. Investigating the physical and chemical properties of asteroid internal materials and structures is an important scientific objective for small body exploration. We developed a small kinetic impactor called the SCI (Small Carry-on Impactor) to achieve this objective. The SCI is a compact kinetic impactor designed to remove a small region of Ryugu's uppermost surface regolith layer and create an artificial crater. The spacecraft deployed the SCI on April 5, 2019, successfully creating an artificial crater with a diameter of 15 m. This paper describes the operational planning of the kinetic impact experiment and summarizes the operation results.

    DOI: 10.1016/j.actaastro.2020.05.064

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  81. Thermophysical properties of the surface of asteroid 162173 Ryugu: Infrared observations and thermal inertia mapping Reviewed

    Yuri Shimaki, Hiroki Senshu, Naoya Sakatani, Tatsuaki Okada, Tetsuya Fukuhara, Satoshi Tanaka, Makoto Taguchi, Takehiko Arai, Hirohide Demura, Yoshiko Ogawa, Kentaro Suko, Tomohiko Sekiguchi, Toru Kouyama, Sunao Hasegawa, Jun Takita, Tsuneo Matsunaga, Takeshi Imamura, Takehiko Wada, Kohei Kitazato, Naru Hirata, Naoyuki Hirata, Rina Noguchi, Seiji Sugita, Shota Kikuchi, Tomohiro Yamaguchi, Naoko Ogawa, Go Ono, Yuya Mimasu, Kent Yoshikawa, Tadateru Takahashi, Yuto Takei, Atsushi Fujii, Hiroshi Takeuchi, Yukio Yamamoto, Manabu Yamada, Kei Shirai, Yu-ichi Iijima, Kazunori Ogawa, Satoru Nakazawa, Fuyuto Terui, Takanao Saiki, Makoto Yoshikawa, Yuichi Tsuda, Sei-ichiro Watanabe

    ICARUS   Vol. 348   2020.9

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    TIR, the thermal infrared imager on Hayabusa2, acquired high-resolution thermal images of the asteroid 162173 Ryugu for one asteroid rotation period on August 1, 2018 to investigate the thermophysical properties of the asteroid. The surface temperatures of Ryugu suggest that the surface has a low thermal inertia, indicating the presence of porous materials. Thermophysical models that neglect or oversimplify surface roughness cannot reproduce the flat diurnal temperature profiles observed during daytime. We performed numerical simulations of a thermophysical model, including the effects of roughness on the diurnal brightness temperature, the predictions of which successfully reproduced the observed diurnal variation of temperature. The global thermal inertia was obtained with a standard deviation of 225 +/- 45 J m(-2) S-0.5 K-1 which is relatively low but still within the range of the value estimated in our previous study (Okada et al., Nature 579, 518-522, 2020), confirming that the boulders on Ryugu are more porous in nature than typical carbonaceous chondrites. The global surface roughness (the ratio of the variance of the height relative to a local horizontal surface length) was determined as 0.41 +/- 0.08, corresponding to a RMS surface slope of 47 +/- 5 degrees. We identified a slightly lower roughness distributed along the equatorial ridge, implying a mass movement of boulders from the equatorial ridge to the mid-latitudes.

    DOI: 10.1016/j.icarus.2020.113835

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  82. Dynamic precise orbit determination of Hayabusa2 using laser altimeter (LIDAR) and image tracking data sets Reviewed

    Yamamoto Keiko, Otsubo Toshimichi, Matsumoto Koji, Noda Hirotomo, Namiki Noriyuki, Takeuchi Hiroshi, Ikeda Hitoshi, Yoshikawa Makoto, Yamamoto Yukio, Senshu Hiroki, Mizuno Takahide, Hirata Naru, Yamada Ryuhei, Ishihara Yoshiaki, Araki Hiroshi, Abe Shinsuke, Yoshida Fumi, Higuchi Arika, Sasaki Sho, Oshigami Shoko, Tsuruta Seiitsu, Asari Kazuyoshi, Shizugami Makoto, Ogawa Naoko, Ono Go, Mimasu Yuya, Yoshikawa Kent, Takahashi Tadateru, Takei Yuto, Fujii Atsushi, Yamaguchi Tomohiro, Kikuchi Shota

    EARTH PLANETS AND SPACE   Vol. 72 ( 1 )   2020.6

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    The precise orbit of the Hayabusa2 spacecraft with respect to asteroid Ryugu is dynamically determined using the data sets collected by the spacecraft's onboard laser altimeter (LIght Detection And Ranging, LIDAR) and automated image tracking (AIT). The LIDAR range data and the AIT angular data play complementary roles because LIDAR is sensitive to the line-of-sight direction from Hayabusa2 to Ryugu, while the AIT is sensitive to the directions perpendicular to it. Using LIDAR and AIT, all six components of the initial state vector can be derived stably, which is difficult to achieve using only LIDAR or AIT. The coefficient of solar radiation pressure (SRP) of the Hayabusa2 spacecraft and standard gravitational parameter (GM) of Ryugu can also be estimated in the orbit determination process, by combining multiple orbit arcs at various altitudes. In the process of orbit determination, the Ryugu-fixed coordinate of the center of the LIDAR spot is determined by fitting the range data geometrically to the topography of Ryugu using the Markov Chain Monte Carlo method. Such an approach is effective for realizing the rapid convergence of the solution. The root mean squares of the residuals of the observed minus computed values of the range and brightness-centroid direction of the image are 1.36 m and 0.0270 degrees, respectively. The estimated values of the GM of Ryugu and a correction factor to our initial SRP model are 29.8 +/- 0.3 m(3)/s(2) and 1.13 +/- 0.16, respectively.

    DOI: 10.1186/s40623-020-01213-2

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  83. Hayabusa2 mission status: Landing, roving and cratering on asteroid Ryugu Reviewed

    Tsuda Yuichi, Saiki Takanao, Terui Fuyuto, Nakazawa Satoru, Yoshikawa Makoto, Watanabe Sei-ichiro

    ACTA ASTRONAUTICA   Vol. 171   page: 42 - 54   2020.6

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    DOI: 10.1016/j.actaastro.2020.02.035

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  84. Collisional formation of top-shaped asteroids and implications for the origins of Ryugu and Bennu Reviewed International coauthorship

    Michel P, Ballouz R-L, Barnouin O. S, Jutzi M, Walsh K. J, May B. H, Manzoni C, Richardson D. C, Schwartz S. R, Sugita S, Watanabe S, Miyamoto H, Hirabayashi M, Bottke W. F, Connolly H. C, Yoshikawa M, Lauretta D. S

    NATURE COMMUNICATIONS   Vol. 11 ( 1 )   2020.5

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    Asteroid shapes and hydration levels can serve as tracers of their history and origin. For instance, the asteroids (162173) Ryugu and (101955) Bennu have an oblate spheroidal shape with a pronounced equator, but contain different surface hydration levels. Here we show, through numerical simulations of large asteroid disruptions, that oblate spheroids, some of which have a pronounced equator defining a spinning top shape, can form directly through gravitational reaccumulation. We further show that rubble piles formed in a single disruption can have similar porosities but variable degrees of hydration. The direct formation of top shapes from single disruption alone can explain the relatively old crater-retention ages of the equatorial features of Ryugu and Bennu. Two separate parent-body disruptions are not necessarily required to explain their different hydration levels.

    DOI: 10.1038/s41467-020-16433-z

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  85. Improving Hayabusa2 trajectory by combining LIDAR data and a shape model Reviewed

    Matsumoto Koji, Noda Hirotomo, Ishihara Yoshiaki, Senshu Hiroki, Yamamoto Keiko, Hirata Naru, Hirata Naoyuki, Namiki Noriyuki, Otsubo Toshimichi, Higuchi Arika, Watanabe Sei-ichiro, Ikeda Hitoshi, Mizuno Takahide, Yamada Ryuhei, Araki Hiroshi, Abe Shinsuke, Yoshida Fumi, Sasaki Sho, Oshigami Shoko, Tsuruta Seiitsu, Asari Kazuyoshi, Shizugami Makoto, Yamamoto Yukio, Ogawa Naoko, Kikuchi Shota, Saiki Takanao, Tsuda Yuichi, Yoshikawa Makoto, Tanaka Satoshi, Terui Fuyuto, Nakazawa Satoru, Yamaguchi Tomohiro, Takei Yuto, Takeuchi Hiroshi, Okada Tatsuaki, Yamada Manabu, Shimaki Yuri, Shirai Kei, Ogawa Kazunori, Iijima Yu-ichi

    ICARUS   Vol. 338   2020.3

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    DOI: 10.1016/j.icarus.2019.113574

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  86. The spatial distribution of impact craters on Ryugu Reviewed

    Hirata Naoyuki, Morota Tomokatsu, Cho Yuichiro, Kanamaru Masanori, Watanabe Sei-ichiro, Sugita Seiji, Hirata Naru, Yamamoto Yukio, Noguchi Rina, Shimaki Yuri, Tatsumi Eri, Yoshioka Kazuo, Sawada Hirotaka, Yokota Yasuhiro, Sakatani Naoya, Hayakawa Masahiko, Matsuoka Moe, Honda Rie, Kameda Shingo, Yamada Manabu, Kouyama Toru, Suzuki Hidehiko, Honda Chikatoshi, Ogawa Kazunori, Tsuda Yuichi, Yoshikawa Makoto, Saiki Takanao, Tanaka Satoshi, Terui Fuyuto, Nakazawa Satoru, Kikuchi Shota, Yamaguchi Tomohiro, Ogawa Naoko, Ono Go, Mimasu Yuya, Yoshikawa Kent, Takahashi Tadateru, Takei Yuto, Fujii Atsushi, Takeuchi Hiroshi, Okada Tatsuaki, Shirai Kei, Iijima Yu-ichi

    ICARUS   Vol. 338   2020.3

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    DOI: 10.1016/j.icarus.2019.113527

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  87. Design and Reconstruction of the Hayabusa2 Precision Landing on Ryugu Reviewed International coauthorship

    Shota Kikuchi, Fuyuto Terui, Naoko Ogawa, Takanao Saiki, Go Ono, Kent Yoshikawa, Yuto Takei, Yuya Mimasu, Hitoshi Ikeda, Hirotaka Sawada, Stefaan Van Wal, Seiji Sugita, Sei-ichiro Watanabe, Yuichi Tsuda

    Journal of Spacecraft and Rockets   Vol. 57 ( 5 ) page: 1033 - 1060   2020

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    DOI: 10.2514/1.A34683

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  88. Initial Achievements of Hayabusa2 in Asteroid Proximity Phase Reviewed

    Yuichi TSUDA, Takanao SAIKI, Fuyuto TERUI, Satoru NAKAZAWA, Makoto YOSHIKAWA, Seiichiro WATANABE

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES   Vol. 63 ( 4 ) page: 115 - 123   2020

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    DOI: 10.2322/tjsass.63.115

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  89. Improving Hayabusa2 trajectory by combining LIDAR data and a shape model Reviewed

    Koji Matsumoto, Hirotomo Noda, Yoshiaki Ishihara, Hiroki Senshu, Keiko Yamamoto, Naru Hirata, Naoyuki Hirata, Noriyuki Namiki, Toshimichi Otsubo, Arika Higuchi, Sei-ichiro Watanabe, Hitoshi Ikeda, Takahide Mizuno, Ryuhei Yamada, Hiroshi Araki, Shinsuke Abe, Fumi Yoshida, Sho Sasaki, Shoko Oshigami, Seiitsu Tsuruta, Kazuyoshi Asari, Makoto Shizugami, Yukio Yamamoto, Naoko Ogawa, Shota Kikuchi, Takanao Saiki, Yuichi Tsuda, Makoto Yoshikawa, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Tomohiro Yamaguchi, Yuto Takei, Hiroshi Takeuchi, Tatsuaki Okada, Manabu Yamada, Yuri Shimaki, Kei Shirai, Kazunori Ogawa

    Icarus   Vol. Accepted   2019.11

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  90. Boulder size and shape distributions on asteroid Ryugu Reviewed International coauthorship

    Tatsuhiro Michikami, Chikatoshi Honda, Hideaki Miyamoto, Masatoshi Hirabayashi, Axel Hagermann, Terunori Irie, Keita Nomura, Carolyn M. Ernst, Masaki Kawamura, Kiichi Sugimoto, Eri Tatsumi, Tomokatsu Morota, Naru Hirata, Takaaki Noguchi, Yuichiro Cho, Shingo Kameda, Toru Kouyama, Yasuhiro Yokota, Rina Noguchi, Masahiko Hayakawa, Naoyuki Hirata, Rie Honda, Moe Matsuoka, Naoya Sakatani, Hidehiko Suzuki, Manabu Yamada, Kazuo Yoshioka, Hirotaka Sawada, Ryodo Hemmi, Hiroshi Kikuchi, Kazunori Ogawa, Sei-ichiro Watanabe, Satoshi Tanaka, Makoto Yoshikawa, Yuichi Tsuda, Seiji Sugita

    Icarus   Vol. 331   page: 179 - 191   2019.10

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    © 2019 The Authors In 2018, the Japanese spacecraft Hayabusa2, arrived at the small asteroid Ryugu. The surface of this C-type asteroid is covered with numerous boulders whose size and shape distributions are investigated in this study. Using a few hundred Optical Navigation Camera (ONC) images with a pixel scale of approximately 0.65 m, we focus on boulders greater than 5 m in diameter. Smaller boulders are also considered using five arbitrarily chosen ONC close-up images with pixel scales ranging from 0.7 to 6 cm. Across the entire surface area (~2.7 km2) of Ryugu, nearly 4400 boulders larger than 5 m were identified. Boulders appear to be uniformly distributed across the entire surface, with some slight differences in latitude and longitude. At ~50 km−2, the number density of boulders larger than 20 m is twice as large as on asteroid Itokawa (or Bennu). The apparent shapes of Ryugu's boulders resemble laboratory impact fragments, with larger boulders being more elongated. The ratio of the total volume of boulders larger than 5 m to the total excavated volume of craters larger than 20 m on Ryugu can be estimated to be ~94%, which is comparatively high. These observations strongly support the hypothesis that most boulders found on Ryugu resulted from the catastrophic disruption of Ryugu's larger parent body, as described in previous papers (Watanabe et al., 2019; Sugita et al., 2019). The cumulative size distribution of boulders larger than 5 m has a power-index of −2.65 ± 0.05, which is comparatively shallow compared with other asteroids visited by spacecraft. For boulders smaller than 4 m, the power-index is even shallower and ranges from −1.65 ± 0.05 to −2.01 ± 0.06. This particularly shallow power-index implies that some boulders are buried in Ryugu's regolith. Based on our observations, we suggest that boulders near the equator might have been buried by the migration of finer material and, as a result, the number density of boulders larger than 5 m in the equatorial region is lower than at higher latitudes.

    DOI: 10.1016/j.icarus.2019.05.019

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  91. Images from the surface of asteroid Ryugu show rocks similar to carbonaceous chondrite meteorites Reviewed International coauthorship

    R. Jaumann, N. Schmitz, T. M. Ho, S. E. Schröder, K. A. Otto, K. Stephan, S. Elgner, K. Krohn, F. Preusker, F. Scholten, J. Biele, S. Ulamec, C. Krause, S. Sugita, K. D. Matz, T. Roatsch, R. Parekh, S. Mottola, M. Grott, P. Michel, F. Trauthan, A. Koncz, H. Michaelis, C. Lange, J. T. Grundmann, M. Maibaum, K. Sasaki, F. Wolff, J. Reill, A. Moussi-Soffys, L. Lorda, W. Neumann, J. B. Vincent, R. Wagner, J. P. Bibring, S. Kameda, H. Yano, S. Watanabe, M. Yoshikawa, Y. Tsuda, T. Okada, T. Yoshimitsu, Y. Mimasu, T. Saiki, H. Yabuta, H. Rauer, R. Honda, T. Morota, Y. Yokota, T. Kouyama

    Science   Vol. 365 ( 6455 ) page: 817 - +   2019.8

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    © 2017 The Authors. The near-Earth asteroid (162173) Ryugu is a 900-m-diameter dark object expected to contain primordial material from the solar nebula. The Mobile Asteroid Surface Scout (MASCOT) landed on Ryugu’s surface on 3 October 2018. We present images from the MASCOT camera (MASCam) taken during the descent and while on the surface. The surface is covered by decimeter- to meter-sized rocks, with no deposits of fine-grained material. Rocks appear either bright, with smooth faces and sharp edges, or dark, with a cauliflower-like, crumbly surface. Close-up images of a rock of the latter type reveal a dark matrix with small, bright, spectrally different inclusions, implying that it did not experience extensive aqueous alteration. The inclusions appear similar to those in carbonaceous chondrite meteorites.

    DOI: 10.1126/science.aaw8627

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  92. Multivariable statistical analysis of spectrophotometry and spectra of (162173) Ryugu as observed by JAXA Hayabusa2 mission Reviewed International coauthorship

    Barucci M. A, Hasselmann P. H, Fulchignoni M, Honda R, Yokota Y, Sugita S, Kitazato K, Deshapriya J. D. P, Perna D, Tatsumi E, Domingue D, Morota T, Kameda S, Iwata T, Abe M, Ohtake M, Matsuura S, Matsuoka M, Hiroi T, Nakamura T, Kouyama T, Suzuki H, Yamada M, Sakatani N, Honda C, Ogawa K, Hayakawa M, Yoshioka K, Cho Y, Sawada H, Takir D, Vilas F, Hirata N, Hirata N, Tanaka S, Yamamoto Y, Yoshikawa M, Watanabe S, Tsuda Y

    ASTRONOMY & ASTROPHYSICS   Vol. 629   page: A13 - A13   2019.8

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    <italic>Context.</italic> Starting from late June 2018, the JAXA asteroid sample return mission Hayabusa2 acquired a large quantity of resolved images and spectra of the surface of the asteroid (162173) Ryugu.


    <italic>Aims.</italic> By studying the visible and near-infrared spectral behavior across the surface of Ryugu using a statistical analysis, we aim to distinguish spectral homogeneous groups and to detect the small heterogeneities. This allows us to better constrain the surface composition variations.


    <italic>Methods.</italic> In order to isolate and interpret the difference in the asteroid surface spectral behavior, we applied the <italic>G</italic>-mode multivariate statistical analysis to a set of pixels containing information of (i) the visible ONC-T spectrophotometry, and (ii) the near-infrared NIRS3 spectra thereby obtaining automatic statistical clustering at different confidence levels.


    <italic>Results.</italic> The analysis of both ONC-T and NIRS3 data allows us to highlight small spectral variations on the Ryugu surface. At a 3<italic>σ</italic> confidence level, only two groups are evident, while going down to 2<italic>σ</italic> more groups are obtained with differences in spectral slope and band depth.


    <italic>Conclusions.</italic> The identified groups have been associated with main morphological surface features. The spectral slope variations that characterize the small groups obtained by ONC-T data analysis, are interpreted as a consequence of space weathering with the presence of more or less fresh material and/or the different grain sizes of the regolith. The variations found analyzing the NIRS3 data are attributed to slightly different contents of hydrated material and different regolith sizes. The distribution on the Ryugu surface of the groups obtained by the analysis of the two instruments indicates a clear spectral dichotomy both between the east and west, and the north and south hemispheres. Small sized regolith grains associated to the redder spectra seem concentrated in the southwestern part of the body.

    DOI: 10.1051/0004-6361/201935851

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  93. HAYABUSA2: CURRENT SUMMARY. Reviewed International coauthorship

    Nakamura T., Watanabe S., Hirabayashi M., Hirata N., Hirata N., Noguchi R., Shimaki Y., Ikeda H., Tatsumi E., Yoshikawa M., Kikuchi S., Yabuta H., Tachibana S., Ishihara Y., Morota T., Kitazato K., Sakatani N., Matsumoto K., Wada K., Senshu H., Honda C., Michikami T., Takeuchi H., Kouyama T., Honda R., Kameda S., Fuse T., Miyamoto H., Komatsu G., Sugita S., Okada T., Namiki N., Arakawa M., Ishiguro M., Abe M., Gaskell R., Palmer E., Barnouin O. S., Michel P., French A. S., McMahon J. W., Scheeres D. J., Abell P. A., Yamamoto Y., Tanaka S., Shirai K., Matsuoka M., Yamada M., Yokota Y., Suzuki H., Yoshioka K., Cho Y., Tanaka S., Nishikawa N., Sugiyama T., Kikuchi H., Hemmi R., Yamaguchi T., Ogawa N., Ono G., Mimasu Y., Yoshikawa K., Takahashi T., Takei Y., Fujii A., Hirose C., Iwata T., Hayakawa M., Hosoda S., Mori O., Sawada H., Shimada T., Soldini S., Yano H., Tsukizaki R., Ozaki M., Iijima Y., Ogawa K., Fujimoto M., Ho T. -M., Moussi A., Jaumann R., Bibring J. -P., Krause C., Terui F., Saiki T., Nakazawa S., Tsuda Y.

    METEORITICS & PLANETARY SCIENCE   Vol. 54   page: .   2019.8

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  94. SPECTRAL CHARACTERISTICS OF ASTEROID (162173) RYUGU WITH HAYABUSA2 NIRS3 Reviewed International coauthorship

    Takir D, Kitazato K, Milliken R. E, Iwata T, Abe M, Ohtake M, Matsuura S, Arai T, Nakauchi Y, Nakamura T, Matsuoka M, Senshu H, Hirata N, Hiroi T, Pilorget C, Brnnetto R, Poulet F, Riu L, Bibring J. -P, Domingue D. L, Vilas F, Barucci M. A, Perna D, Palomba E, Galiano A, Tsumura K, Osawa T, Komatsu M, Nakato A, Arai T, Takato N, Matsunaga Y, Takagi Y, Matsumoto K, Kouyama T, Yokota Y, Tatsumi E, Sakatani N, Yamamoto Y, Okada T, Sugita S, Honda R, Morota

    METEORITICS & PLANETARY SCIENCE   Vol. 54   page: .   2019.8

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  95. RYUGU'S PARENT-BODY PROCESSES ESTIMATED FROM HAYABUSA2 MULTI-BAND OPTICAL OBSERVATIONS Reviewed International coauthorship

    Sugita S, Honda R, Morota T, Kameda S, Tatsumi E, Honda C, Yokota Y, Yamada M, Kouyama T, Sakatani N, Suzuki H, Yoshioka K, Cho Y, Matsuoka M, Ogawa K, Domingue D, Miyamoto H, Barnouin O. S, Michel P, Ernst C. M, Hiroi T, Nakamura T, Sawada H, Hayakawa M, Hirata N, Hirata N, Kikuchi H, Hemmi R, Michikami T, Palmer Eric, Gaskell R, Hirabayashi M, Jaumann R, Otto K, Schmitz N, Schroder S. E, Komatsu G, Tanaka S, Shirai K, Yoshikawa M, Watanabe S, Tsuda Y

    METEORITICS & PLANETARY SCIENCE   Vol. 54   page: .   2019.8

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  96. The unexpected surface of asteroid (101955) Bennu Reviewed International coauthorship

    Lauretta D. S, DellaGiustina D. N, Bennett C. A, Golish D. R, Becker K. J, Balram-Knutson S. S, Barnouin O. S, Becker T. L, Bottke W. F, Boynton W. V, Campins H, Clark B. E, Connolly H. C. Jr, d'Aubigny C, Y. Drouet, Dworkin J. P, Emery J. P, Enos H. L, Hamilton V. E, Hergenrother C. W, Howell E. S, Izawa M. R. M, Kaplan H. H, Nolan M. C, Rizk B, Roper H. L, Scheeres D. J, Smith P. H, Walsh K. J, Wolner C. W. V, Highsmith D. E, Small J, Vokrouhlicky D, Bowles N. E, Brown E, Hanna K, L. Donaldson, Warren T, Brunet C, Chicoine R. A, Desjardins S, Gaudreau D, Haltigin T, Millington-Veloza S, Rubi A, Aponte J, Gorius N, Lunsford A, Allen B, Grindlay J, Guevel D, Hoak D, Hong J, Schrader D. L, Bayron J, Golubov O, Sanchez P, Stromberg J, Hirabayashi M, Hartzell C. M, Oliver S, Rascon M, Harch A, Joseph J, Squyres S, Richardson D, McGraw L, Ghent R, Binzel R. P, Al Asad M. M, Johnson C. L, Philpott L, Susorney H. C. M, Cloutis E. A, Hanna R. D, Ciceri F, Hildebrand A. R, Ibrahim E. -M, Breitenfeld L, Glotch T, Rogers A. D, Ferrone S, Thomas C. A, Fernandez Y, Chang W, Cheuvront A, Trang D, Tachibana S, Yurimoto H, Brucato J. R, Poggiali G, Pajola M, Dotto E, Epifani E. Mazzotta, Crombie M. K, Lantz C, de Leon J, Licandro J, Rizos Garcia J. L, Clemett S, Thomas-Keprta K, Van Wal S, Yoshikawa M, Bellerose J, Bhaskaran S, Boyles C, Chesley S. R, Elder C. M, Farnocchia D, Harbison A, Kennedy B, Knight A, Martinez-Vlasoff N, Mastrodemos N, McElrath T, Owen W, Park R, Rush B, Swanson L, Takahashi Y, Velez D, Yetter K, Thayer C, Adam C, Antreasian P, Bauman J, Bryan C, Carcich B, Corvin M, Geeraert J, Hoffman J, Leonard J. M, Lessac-Chenen E, Levine A, McAdams J, McCarthy L, Nelson D, Page B, Pelgrift J, Sahr E, Stakkestad K, Stanbridge D, Wibben D, Williams B, Williams K, Wolff P, Hayne P, Kubitschek D, Barucci M. A, Deshapriya J. D. P, Fornasier S, Fulchignoni M, Hasselmann P, Merlin F, Praet A, Bierhaus E. B, Billett O, Boggs A, Buck B, Carlson-Kelly S, Cerna J, Chaffin K, Church E, Coltrin M, Daly J, Deguzman A, Dubisher R, Eckart D, Ellis D, Falkenstern P, Fisher A, Fisher M. E, Fleming P, Fortney K, Francis S, Freund S, Gonzales S, Haas P, Hasten A, Hauf D, Hilbert A, Howell D, Jaen F, Jayakody N, Jenkins M, Johnson K, Lefevre M, Ma H, Mario C, Martin K, May C, Mcgee M, Miller B, Miller C, Miller G, Mirfakhrai A, Muhle E, Norman C, Olds R, Parish C, Ryle M, Schmitzer M, Sherman P, Skeen M, Susak M, Sutter B, Tran Q, Welch C, Witherspoon R, Wood J, Zareski J, Arvizu-Jakubicki M, Asphaug E, Audi E, Ballouz R. -L, Bandrowski R, Bendall S, Bloomenthal H, Blum D, Brodbeck J, Burke K. N, Chojnacki M, Colpo A, Contreras J, Cutts J, Dean D, Diallo B, Drinnon D, Drozd K, Enos R, Fellows C, Ferro T, Fisher M. R, Fitzgibbon G, Fitzgibbon M

    NATURE   Vol. 568 ( 7750 ) page: 55 - +   2019.4

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    DOI: 10.1038/s41586-019-1033-6

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  97. Craters, boulders and regolith of (101955) Bennu indicative of an old and dynamic surface Reviewed International coauthorship

    Walsh, K.J., Jawin, E.R., Ballouz, R.-L., Barnouin, O.S., Bierhaus, E.B., Connolly, H.C., Molaro, J.L., McCoy, T.J., Delbo’, M., Hartzell, C.M., Pajola, M., Schwartz, S.R., Trang, D., Asphaug, E., Becker, K.J., Beddingfield, C.B., Bennett, C.A., Bottke, W.F., Burke, K.N., Clark, B.C., Daly, M.G., DellaGiustina, D.N., Dworkin, J.P., Elder, C.M., Golish, D.R., Hildebrand, A.R., Malhotra, R., Marshall, J., Michel, P., Nolan, M.C., Perry, M.E., Rizk, B., Ryan, A., Sandford, S.A., Scheeres, D.J., Susorney, H.C.M., Thuillet, F., Lauretta, D.S., Highsmith, D.E., Small, J., Vokrouhlický, D., Bowles, N.E., Brown, E., Donaldson Hanna, K.L., Warren, T., Brunet, C., Chicoine, R.A., Desjardins, S., Gaudreau, D., Haltigin, T., Millington-Veloza, S., Rubi, A., Aponte, J., Gorius, N., Lunsford, A., Allen, B., Grindlay, J., Guevel, D., Hoak, D., Hong, J., Schrader, D.L., Bayron, J., Golubov, O., Sánchez, P., Stromberg, J., Hirabayashi, M., Hartzell, C.M., Oliver, S., Rascon, M., Harch, A., Joseph, J., Squyres, S., Richardson, D., Emery, J.P., McGraw, L., Ghent, R., Binzel, R.P., Al Asad, M.M., Johnson, C.L., Philpott, L., Susorney, H.C.M., Cloutis, E.A., Hanna, R.D., Connolly, H.C., Ciceri, F., Hildebrand, A.R., Ibrahim, E.-M., Breitenfeld, L., Glotch, T., Rogers, A.D., Clark, B.E., Ferrone, S., Thomas, C.A., Campins, H., Fernandez, Y., Chang, W., Cheuvront, A., Trang, D., Tachibana, S., Yurimoto, H., Brucato, J.R., Poggiali, G., Pajola, M., Dotto, E., Epifani, E.M., Crombie, M.K., Lantz, C., Izawa, M.R.M., de Leon, J., Licandro, J., Garcia, J.L.R., Clemett, S., Thomas-Keprta, K., Van wal, S., Yoshikawa, M., Bellerose, J., Bhaskaran, S., Boyles, C., Chesley, S.R., Elder, C.M., Farnocchia, D., Harbison, A., Kennedy, B., Knight, A., Martinez-Vlasoff, N., Mastrodemos, N., McElrath, T., Owen, W., Park, R., Rush, B., Swanson, L., Takahashi, Y., Velez, D., Yetter, K., Thayer, C., Adam, C., Antreasian, P., Bauman, J., Bryan, C., Carcich, B., Corvin, M., Geeraert, J., Hoffman, J., Leonard, J.M., Lessac-Chenen, E., Levine, A., McAdams, J., McCarthy, L., Nelson, D., Page, B., Pelgrift, J., Sahr, E., Stakkestad, K., Stanbridge, D., Wibben, D., Williams, B., Williams, K., Wolff, P., Hayne, P., Kubitschek, D., Barucci, M.A., Deshapriya, J.D.P., Fornasier, S., Fulchignoni, M., Hasselmann, P., Merlin, F., Praet, A., Bierhaus, E.B., Billett, O., Boggs, A., Buck, B., Carlson-Kelly, S., Cerna, J., Chaffin, K., Church, E., Coltrin, M., Daly, J., Deguzman, A., Dubisher, R., Eckart, D., Ellis, D., Falkenstern, P., Fisher, A., Fisher, M.E., Fleming, P., Fortney, K., Francis, S., Freund, S., Gonzales, S., Haas, P., Hasten, A., Hauf, D., Hilbert, A., Howell, D., Jaen, F., Jayakody, N., Jenkins, M., Johnson, K., Lefevre, M., Ma, H., Mario, C., Martin, K., May, C., McGee, M., Miller, B., Miller, C., Miller, G., Mirfakhrai, A., Muhle, E., Norman, C., Olds, R., Parish, C., Ryle, M., Schmitzer, M., Sherman, P., Skeen, M., Susak, M., Sutter, B., Tran, Q., Welch, C., Witherspoon, R., Wood, J., Zareski, J., Arvizu-Jakubicki, M., Asphaug, E., Audi, E., Ballouz, R.-L., Bandrowski, R., Becker, K.J., Becker, T.L., Bendall, S., Bennett, C.A., Bloomenthal, H., Blum, D., Boynton, W.V., Brodbeck, J., Burke, K.N., Chojnacki, M., Colpo, A., Contreras, J., Cutts, J., Drouet d’Aubigny, C.Y., Dean, D., DellaGiustina, D.N., Diallo, B., Drinnon, D., Drozd, K., Enos, H.L., Enos, R., Fellows, C., Ferro, T., Fisher, M.R., Fitzgibbon, G., Fitzgibbon, M., Forelli, J., Forrester, T., Galinsky, I., Garcia, R., Gardner, A., Golish, D.R., Habib, N., Hamara, D., Hammond, D., Hanley, K., Harshman, K., Hergenrother, C.W., Herzog, K., Hill, D., Hoekenga, C., Hooven, S., Howell, E.S., Huettner, E., Janakus, A., Jones, J., Kareta, T.R., Kidd, J., Kingsbury, K., Balram-Knutson, S.S., Koelbel, L., Kreiner, J., Lambert, D., Lauretta, D.S., Lewin, C., Lovelace, B., Loveridge, M., Lujan, M., Maleszewski, C.K., Malhotra, R., Marchese, K., McDonough, E., Mogk, N., Morrison, V., Morton, E., Munoz, R., Nelson, J., Nolan, M.C., Padilla, J., Pennington, R., Polit, A., Ramos, N., Reddy, V., Riehl, M., Rizk, B., Roper, H.L., Salazar, S., Schwartz, S.R., Selznick, S., Shultz, N., Smith, P.H., Stewart, S., Sutton, S., Swindle, T., Tang, Y.H., Westermann, M., Wolner, C.W.V., Worden, D., Zega, T., Zeszut, Z., Bjurstrom, A., Bloomquist, L., Dickinson, C., Keates, E., Liang, J., Nifo, V., Taylor, A., Teti, F., Caplinger, M., Bowles, H., Carter, S., Dickenshied, S., Doerres, D., Fisher, T., Hagee, W., Hill, J., Miner, M., Noss, D., Piacentine, N., Smith, M., Toland, A., Wren, P., Bernacki, M., Munoz, D.P., Watanabe, S., Sandford, S.A., Aqueche, A., Ashman, B., Barker, M., Bartels, A., Berry, K., Bos, B., Burns, R., Calloway, A., Carpenter, R., Castro, N., Cosentino, R., Donaldson, J., Dworkin, J.P., Cook, J.E., Emr, C., Everett, D., Fennell, D., Fleshman, K., Folta, D., Gallagher, D., Garvin, J., Getzandanner, K., Glavin, D., Hull, S., Hyde, K., Ido, H., Ingegneri, A., Jones, N., Kaotira, P., Lim, L.F., Liounis, A., Lorentson, C., Lorenz, D., Lyzhoft, J., Mazarico, E.M., Mink, R., Moore, W., Moreau, M., Mullen, S., Nagy, J., Neumann, G., Nuth, J., Poland, D., Reuter, D.C., Rhoads, L., Rieger, S., Rowlands, D., Sallitt, D., Scroggins, A., Shaw, G., Simon, A.A., Swenson, J., Vasudeva, P., Wasser, M., Zellar, R., Grossman, J., Johnston, G., Morris, M., Wendel, J., Burton, A., Keller, L.P., McNamara, L., Messenger, S., Nakamura-Messenger, K., Nguyen, A., Righter, K., Queen, E., Bellamy, K., Dill, K., Gardner, S., Giuntini, M., Key, B., Kissell, J., Patterson, D., Vaughan, D., Wright, B., Gaskell, R.W., Le Corre, L., Li, J.-Y., Molaro, J.L., Palmer, E.E., Siegler, M.A., Tricarico, P., Weirich, J.R., Zou, X.-D., Ireland, T., Tait, K., Bland, P., Anwar, S., Bojorquez-Murphy, N., Christensen, P.R., Haberle, C.W., Mehall, G., Rios, K., Franchi, I., Rozitis, B., Beddingfield, C.B., Marshall, J., Brack, D.N., French, A.S., McMahon, J.W., Scheeres, D.J., Jawin, E.R., McCoy, T.J., Russell, S., Killgore, M., Bottke, W.F., Hamilton, V.E., Kaplan, H.H., Walsh, K.J., Bandfield, J.L., Clark, B.C., Chodas, M., Lambert, M., Masterson, R.A., Daly, M.G., Freemantle, J., Seabrook, J.A., Barnouin, O.S., Craft, K., Daly, R.T., Ernst, C., Espiritu, R.C., Holdridge, M., Jones, M., Nair, A.H., Nguyen, L., Peachey, J., Perry, M.E., Plescia, J., Roberts, J.H., Steele, R., Turner, R., Backer, J., Edmundson, K., Mapel, J., Milazzo, M., Sides, S., Manzoni, C., May, B., Delbó, M., Libourel, G., Michel, P., Ryan, A., Thuillet, F., Marty, B.

    Nature Geoscience   Vol. 12 ( 4 ) page: 242 - +   2019.4

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    DOI: 10.1038/s41561-019-0326-6

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  98. The dynamic geophysical environment of (101955) Bennu based on OSIRIS-REx measurements Reviewed

    Scheeres D. J, McMahon J. W, French A. S, Brack D. N, Chesley S. R, Farnocchia D, Takahashi Y, Leonard J. M, Geeraert J, Page B, Antreasian P, Getzandanner K, Rowlands D, Mazarico E. M, Small J, Highsmith D. E, Moreau M, Emery J. P, Rozitis B, Hirabayashi M, Sanchez P, Van Wal S, Tricarico P, Ballouz R-L, Johnson C. L, Al Asad M. M, Susorney H. C. M, Barnouin O. S, Daly M. G, Seabrook J. A, Gaskell R. W, Palmer E. E, Weirich J. R, Walsh K. J, Jawin E. R, Bierhaus E. B, Michel P, Bottke W. F, Nolan M. C, Connolly H. C. Jr, Lauretta D. S, Vokrouhlicky D, Bowles N. E, Brown E, Hanna K, L. Donaldson, Warren T, Brunet C, Chicoine R. A, Desjardins S, Gaudreau D, Haltigin T, Millington-Veloza S, Rubi A, Aponte J, Gorius N, Lunsford A, Allen B, Grindlay J, Guevel D, Hoak D, Hong J, Schrader D. L, Bayron J, Golubov O, Stromberg J, Hirabayashi M, Hartzell C. M, Oliver S, Rascon M, Harch A, Joseph J, Squyres S, Richardson D, Emery J. P, McGraw L, Ghent R, Binzel R. P, Philpott L, Cloutis E. A, Hanna R. D, Connolly H. C. Jr, Ciceri F, Hildebrand A. R, Ibrahim E-M, Breitenfeld L, Glotch T, Rogers A. D, Clark B. E, Ferrone S, Thomas C. A, Campins H, Fernandez Y, Chang W, Cheuvront A, Trang D, Tachibana S, Yurimoto H, Brucato J. R, Poggiali G, Pajola M, Dotto E, Epifani E. Mazzotta, Crombie M. K, Lantz C, Izawa M. R. M, de Leon J, Licandro J, Rizos Garcia J. L, Clemett S, Thomas-Keprta K, Yoshikawa M, Bellerose J, Bhaskaran S, Boyles C, Elder C. M, Harbison A, Kennedy B, Knight A, Martinez-Vlasoff N, Mastrodemos N, McElrath T, Owen W, Park R, Rush B, Swanson L, Velez D, Yetter K, Thayer C, Adam C, Bauman J, Bryan C, Carcich B, Corvin M, Hoffman J, Lessac-Chenen E, Levine A, McAdams J, McCarthy L, Nelson D, Pelgrift J, Sahr E, Stakkestad K, Stanbridge D, Wibben D, Williams B, Williams K, Wolff P, Hayne P, Kubitschek D, Barucci M. A, Deshapriya J. D. P, Fornasier S, Fulchignoni M, Hasselmann P, Merlin F, Praet A, Bierhaus E. B, Billett O, Boggs A, Buck B, Carlson-Kelly S, Cerna J, Chaffin K, Church E, Coltrin M, Daly J, Deguzman A, Dubisher R, Eckart D, Ellis D, Falkenstern P, Fisher A, Fisher M. E, Fleming P, Fortney K, Francis S, Freund S, Gonzales S, Haas P, Hasten A, Hauf D, Hilbert A, Howell D, Jaen F, Jayakody N, Jenkins M, Johnson K, Lefevre M, Ma H, Mario C, Martin K, May C, McGee M, Miller B, Miller C, Miller G, Mirfakhrai A, Muhle E, Norman C, Olds R, Parish C, Ryle M, Schmitzer M, Sherman P, Skeen M, Susak M, Sutter B, Tran Q, Welch C, Witherspoon R, Wood J, Zareski J, Arvizu-Jakubicki M, Asphaug E, Audi E, Bandrowski R, Becker K. J, Becker T. L, Bendall S, Bennett C. A, Bloomenthal H, Blum D, Boynton W. V, Brodbeck J, Burke K. N, Chojnacki M, Colpo A, Contreras J, Cutts J, d'Aubigny C, Y. Drouet, Dean D, DellaGiustina D. N, Diall

    NATURE ASTRONOMY   Vol. 3 ( 4 ) page: 352 - 361   2019.4

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    DOI: 10.1038/s41550-019-0721-3

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  99. Shape of (101955) Bennu indicative of a rubble pile with internal stiffness Reviewed International coauthorship

    O. S. Barnouin, M. G. Daly, E. E. Palmer, R. W. Gaskell, J. R. Weirich, C. L. Johnson, M. M. Al Asad, J. H. Roberts, M. E. Perry, H. C.M. Susorney, R. T. Daly, E. B. Bierhaus, J. A. Seabrook, R. C. Espiritu, A. H. Nair, L. Nguyen, G. A. Neumann, C. M. Ernst, W. V. Boynton, M. C. Nolan, C. D. Adam, M. C. Moreau, B. Rizk, C. Y. Drouet D’Aubigny, E. R. Jawin, K. J. Walsh, P. Michel, S. R. Schwartz, R. L. Ballouz, E. M. Mazarico, D. J. Scheeres, J. W. McMahon, W. F. Bottke, S. Sugita, N. Hirata, S. Watanabe, K. N. Burke, D. N. DellaGiustina, C. A. Bennett, D. S. Lauretta, D. E. Highsmith, J. Small, D. Vokrouhlický, N. E. Bowles, E. Brown, K. L. Donaldson Hanna, T. Warren, C. Brunet, R. A. Chicoine, S. Desjardins, D. Gaudreau, T. Haltigin, S. Millington-Veloza, A. Rubi, J. Aponte, N. Gorius, A. Lunsford, B. Allen, J. Grindlay, D. Guevel, D. Hoak, J. Hong, D. L. Schrader, J. Bayron, O. Golubov, P. Sánchez, J. Stromberg, M. Hirabayashi, C. M. Hartzell, S. Oliver, M. Rascon, A. Harch, J. Joseph, S. Squyres, D. Richardson, J. P. Emery, L. McGraw, R. Ghent, R. P. Binzel, M. M.Al Asad, L. Philpott, E. A. Cloutis, R. D. Hanna, H. C. Connolly, F. Ciceri, A. R. Hildebrand, E. M. Ibrahim, L. Breitenfeld, T. Glotch, A. D. Rogers, B. E. Clark, S. Ferrone, C. A. Thomas, H. Campins, Y. Fernandez, W. Chang, A. Cheuvront, D. Trang, S. Tachibana, H. Yurimoto

    Nature Geoscience   Vol. 12 ( 4 ) page: 247 - +   2019.4

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    © 2019, The Author(s), under exclusive licence to Springer Nature Limited. The shapes of asteroids reflect interplay between their interior properties and the processes responsible for their formation and evolution as they journey through the Solar System. Prior to the OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer) mission, Earth-based radar imaging gave an overview of (101955) Bennu’s shape. Here we construct a high-resolution shape model from OSIRIS-REx images. We find that Bennu’s top-like shape, considerable macroporosity and prominent surface boulders suggest that it is a rubble pile. High-standing, north–south ridges that extend from pole to pole, many long grooves and surface mass wasting indicate some low levels of internal friction and/or cohesion. Our shape model indicates that, similar to other top-shaped asteroids, Bennu formed by reaccumulation and underwent past periods of fast spin, which led to its current shape. Today, Bennu might follow a different evolutionary pathway, with an interior stiffness that permits surface cracking and mass wasting.

    DOI: 10.1038/s41561-019-0330-x

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  100. Properties of rubble-pile asteroid (101955) Bennu from OSIRIS-REx imaging and thermal analysis Reviewed

    DellaGiustina D. N, Emery J. P, Golish D. R, Rozitis B, Bennett C. A, Burke K. N, Ballouz R-L, Becker K. J, Christensen P. R, d'Aubigny C, Y. Drouet, Hamilton V. E, Reuter D. C, Rizk B, Simon A. A, Asphaug E, Bandfield J. L, Barnouin O. S, Barucci M. A, Bierhaus E. B, Binzel R. P, Bottke W. F, Bowles N. E, Campins H, Clark B. C, Clark B. E, Connolly H. C. Jr, Daly M. G, de Leon J, Delbo' M, Deshapriya J. D. P, Elder C. M, Fornasier S, Hergenrother C. W, Howell E. S, Jawin E. R, Kaplan H. H, Kareta T. R, Le Corre L, Li J-Y, Licandro J, Lim L. F, Michel P, Molaro J, Nolan M. C, Pajola M, Popescu M, Rizos Garcia J. L, Ryan A, Schwartz S. R, Shultz N, Siegler M. A, Smith P. H, Tatsumi E, Thomas C. A, Walsh K. J, Wolner C. W. V, Zou X-D, Lauretta D. S, Highsmith D. E, Small J, Vokrouhlicky D, Brown E, Hanna K, L. Donaldson, Warren T, Brunet C, Chicoine R. A, Desjardins S, Gaudreau D, Haltigin T, Millington-Veloza S, Rubi A, Aponte J, Gorius N, Lunsford A, Allen B, Grindlay J, Guevel D, Hoak D, Hong J, Schrader D. L, Bayron J, Golubov O, Sanchez P, Stromberg J, Hirabayashi M, Hartzell C. M, Oliver S, Rascon M, Harch A, Joseph J, Squyres S, Richardson D, McGraw L, Ghent R, Al Asad M. M, Johnson C. L, Philpott L, Susorney H. C. M, Cloutis E. A, Hanna R. D, Ciceri F, Hildebrand A. R, Ibrahim E-M, Breitenfeld L, Glotch T, Rogers A. D, Ferrone S, Fernandez Y, Chang W, Cheuvront A, Trang D, Tachibana S, Yurimoto H, Brucato J. R, Poggiali G, Dotto E, Epifani E. Mazzotta, Crombie M. K, Lantz C, Izawa M. R. M, Clemett S, Thomas-Keprta K, Van Wal S, Yoshikawa M, Bellerose J, Bhaskaran S, Boyles C, Chesley S. R, Farnocchia D, Harbison A, Kennedy B, Knight A, Martinez-Vlasoff N, Mastrodemos N, McElrath T, Owen W, Park R, Rush B, Swanson L, Takahashi Y, Velez D, Yetter K, Thayer C, Adam C, Antreasian P, Bauman J, Bryan C, Carcich B, Corvin M, Geeraert J, Hoffman J, Leonard J. M, Lessac-Chenen E, Levine A, McAdams J, McCarthy L, Nelson D, Page B, Pelgrift J, Sahr E, Stakkestad K, Stanbridge D, Wibben D, Williams B, Williams K, Wolff P, Hayne P, Kubitschek D, Fulchignoni M, Hasselmann P, Merlin F, Praet A, Billett O, Boggs A, Buck B, Carlson-Kelly S, Cerna J, Chaffin K, Church E, Coltrin M, Daly J, Deguzman A, Dubisher R, Eckart D, Ellis D, Falkenstern P, Fisher A, Fisher M. E, Fleming P, Fortney K, Francis S, Freund S, Gonzales S, Haas P, Hasten A, Hauf D, Hilbert A, Howell D, Jaen F, Jayakody N, Jenkins M, Johnson K, Lefevre M, Ma H, Mario C, Martin K, May C, McGee M, Miller B, Miller C, Miller G, Mirfakhrai A, Muhle E, Norman C, Olds R, Parish C, Ryle M, Schmitzer M, Sherman P, Skeen M, Susak M, Sutter B, Tran Q, Welch C, Witherspoon R, Wood J, Zareski J, Arvizu-Jakubicki M, Audi E, Bandrowski R, Becker T. L, Bendall S, Bloomenthal H, Blum D

    NATURE ASTRONOMY   Vol. 3 ( 4 ) page: 341 - 351   2019.4

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    DOI: 10.1038/s41550-019-0731-1

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  101. Evidence for widespread hydrated minerals on asteroid (101955) Bennu Reviewed

    Hamilton V. E, Simon A. A, Christensen P. R, Reuter D. C, Clark B. E, Barucci M. A, Bowles N. E, Boynton W. V, Brucato J. R, Cloutis E. A, Connolly H. C. Jr, Hannah K, L. Donaldson, Emery J. P, Enos H. L, Fornasier S, Haberle C. W, Hanna R. D, Howell E. S, Kaplan H. H, Keller L. P, Lantz C, Li J-Y, Lim L. F, McCoy T. J, Merlins F, Nolan M. C, Praet A, Rozitis B, Sandford S. A, Schrader D. L, Thomas C. A, Zou X-D, Lauretta D. S, Highsmith D. E, Small J, Vokrouhlicky D, Brown E, Warren T, Brunet C, Chicoine R. A, Desjardins S, Gaudreau D, Haltigin T, Millington-Veloza S, Rubi A, Aponte J, Gorius N, Lunsford A, Allen B, Grindlay J, Guevel D, Hoak D, Hong J, Bayron J, Golubov O, Sanchez P, Stromberg J, Hirabayashi M, Hartzell C. M, Oliver S, Rascon M, Harch A, Joseph J, Squyres S, Richardson D, McGraw L, Ghent R, Binzel R. P, Al Asad M. M, Johnson C. L, Philpott L, Susorney H. C. M, Ciceri F, Hildebrand A. R, Ibrahim E-M, Breitenfeld L, Glotch T, Rogers A. D, Ferrone S, Campins H, Fernandez Y, Chang W, Cheuvront A, Trang D, Tachibana S, Yurimoto H, Poggiali G, Pajola M, Dotto E, Epifani E. Mazzotta, Crombie M. K, Izawa M. R. M, de Leon J, Licandro J, Garcia J, L. Rizos, Clemett S, Thomas-Keprta K, Van Wal S, Yoshikawa M, Bellerose J, Bhaskaran S, Boyles C, Chesley S. R, Elder C. M, Farnocchia D, Harbison A, Kennedy B, Knight A, Martinez-Vlasoff N, Mastrodemos N, McElrath T, Owen W, Park R, Rush B, Swanson L, Takahashi Y, Velez D, Yetter K, Thayer C, Adam C, Antreasian P, Bauman J, Bryan C, Carcich B, Corvin M, Geeraert J, Hoffman J, Leonard J. M, Lessac-Chenen E, Levine A, McAdams J, McCarthy L, Nelson D, Page B, Pelgrift J, Sahr E, Stakkestad K, Stanbridge D, Wibben D, Williams B, Williams K, Wolff P, Hayne P, Kubitschek D, Deshapriya J. D. P, Fulchignoni M, Hasselmann P, Merlin F, Bierhaus E. B, Billett O, Boggs A, Buck B, Carlson-Kelly S, Cerna J, Chaffin K, Church E, Coltrin M, Daly J, Deguzman A, Dubisher R, Eckart D, Ellis D, Falkenstern P, Fisher A, Fisher M. E, Fleming P, Fortney K, Francis S, Freund S, Gonzales S, Haas P, Hasten A, Hauf D, Hilbert A, Howell D, Jaen F, Jayakody N, Jenkins M, Johnson K, Lefevre M, Ma H, Mario C, Martin K, May C, McGee M, Miller B, Miller C, Miller G, Mirfakhrai A, Muhle E, Norman C, Olds R, Parish C, Ryle M, Schmitzer M, Sherman P, Skeen M, Susak M, Sutter B, Tran Q, Welch C, Witherspoon R, Wood J, Zareski J, Arvizu-Jakubicki M, Asphaug E, Audi E, Ballouz R-L, Bandrowski R, Becker K. J, Becker T. L, Bendall S, Bennett C. A, Bloomenthal H, Blum D, Brodbeck J, Burke K. N, Chojnacki M, Colpo A, Contreras J, Cutts J, d'Aubigny C, Y. Drouet, Dean D, DellaGiustina D. N, Diallo B, Drinnon D, Drozd K, Enos R, Fellows C, Ferro T, Fisher M. R, Fitzgibbon G, Fitzgibbon M, Forelli J, Forrester T, Gal

    NATURE ASTRONOMY   Vol. 3 ( 4 ) page: 332 - 340   2019.4

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    DOI: 10.1038/s41550-019-0722-2

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  102. The Western Bulge of 162173 Ryugu Formed as a Result of a Rotationally Driven Deformation Process Reviewed International coauthorship

    Masatoshi Hirabayashi, Eri Tatsumi, Hideaki Miyamoto, Goro Komatsu, Seiji Sugita, Sei-ichiro Watanabe, Daniel J. Scheeres, Olivier S. Barnouin, Patrick Michel, Chikatoshi Honda, Tatsuhiro Michikami, Yuichiro Cho, Tomokatsu Morota, Naru Hirata, Naoyuki Hirata, Naoya Sakatani, Stephen R. Schwartz, Rie Honda, Yasuhiro Yokota, Shingo Kameda, Hidehiko Suzuki, Toru Kouyama, Masahiko Hayakawa, Moe Matsuoka, Kazuo Yoshioka, Kazunori Ogawa, Hirotaka Sawada, Makoto Yoshikawa, Yuichi Tsuda

    Astrophysical Journal Letters   Vol. 874 ( 1 )   2019.3

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    © 2019. The American Astronomical Society. All rights reserved.. 162173 Ryugu, the target of Hayabusa2, has a round shape with an equatorial ridge, which is known as a spinning top shape. A strong centrifugal force is a likely contributor to Ryugu's top-shaped features. Observations by the Optical Navigation Camera on board Hayabusa2 show a unique longitudinal variation in geomorphology; the western side of this asteroid, later called the western bulge, has a smooth surface and a sharp equatorial ridge, compared to the other side. Here, we propose a structural deformation process that generated the western bulge. Applying the mission-derived shape model, we employ a finite element model technique to analyze the locations that experience structural failure within the present shape. Assuming that materials are uniformly distributed, our model shows the longitudinal variation in structurally failed regions when the spin period is shorter than ∼3.75 hr. Ryugu is structurally intact in the subsurface region of the western bulge while other regions are sensitive to structural failure. We infer that this variation is indicative of the deformation process that occurred in the past, and the western bulge is more relaxed structurally than the other region. Our analysis also shows that this deformation process might occur at a spin period between ∼3.5 and ∼3.0 hr, providing the cohesive strength ranging between ∼4 and ∼10 Pa.

    DOI: 10.3847/2041-8213/ab0e8b

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  103. The operational environment and rotational acceleration of asteroid (101955) Bennu from OSIRIS-REx observations Reviewed International coauthorship

    Hergenrother C. W, Maleszewski C. K, Nolan M. C, Li J-Y, d'Aubigny C, Y. Drouet, Shelly F. C, Howell E. S, Kareta T. R, Izawa M. R. M, Barucci M. A, Bierhaus E. B, Campins H, Chesley S. R, Clark B. E, Christensen E. J, DellaGiustina D. N, Fornasier S, Golish D. R, Hartzell C. M, Rizk B, Scheeres D. J, Smith P. H, Zou X-D, Lauretta D. S, Highsmith D. E, Small J, Vokrouhlicky D, Bowles N. E, Brown E, Hanna K, L. Donaldson, Warren T, Brunet C, Chicoine R. A, Desjardins S, Gaudreau D, Haltigin T, Millington-Veloza S, Rubi A, Aponte J, Gorius N, Lunsford A, Allen B, Grindlay J, Guevel D, Hoak D, Hong J, Schrader D. L, Bayron J, Golubov O, Sanchez P, Stromberg J, Hirabayashi M, Oliver S, Rascon M, Harch A, Joseph J, Squyres S, Richardson D, Emery J. P, McGraw L, Ghent R, Binzel R. P, Al Asad M. M, Johnson C. L, Philpott L, Susorney H. C. M, Cloutis E. A, Hanna R. D, Connolly H. C. Jr, Ciceri F, Hildebrand A. R, Ibrahim E-M, Breitenfeld L, Glotch T, Rogers A. D, Ferrone S, Thomas C. A, Fernandez Y, Chang W, Cheuvront A, Trang D, Tachibana S, Yurimoto H, Brucato J. R, Poggiali G, Pajola M, Dotto E, Epifani E. Mazzotta, Crombie M. K, Lantz C, de Leon J, Licandro J, Rizos Garcia J. L, Clemett S, Thomas-Keprta K, Van Wal S, Yoshikawa M, Bellerose J, Bhaskaran S, Boyles C, Elder C. M, Farnocchia D, Harbison A, Kennedy B, Knight A, Martinez-Vlasoff N, Mastrodemos N, McElrath T, Owen W, Park R, Rush B, Swanson L, Takahashi Y, Velez D, Yetter K, Thayer C, Adam C, Antreasian P, Bauman J, Bryan C, Carcich B, Corvin M, Geeraert J, Hoffman J, Leonard J. M, Lessac-Chenen E, Levine A, McAdams J, McCarthy L, Nelson D, Page B, Pelgrift J, Sahr E, Stakkestad K, Stanbridge D, Wibben D, Williams B, Williams K, Wolff P, Hayne P, Kubitschek D, Deshapriya J. D. P, Fulchignoni M, Hasselmann P, Merlin F, Praet A, Billett O, Boggs A, Buck B, Carlson-Kelly S, Cerna J, Chaffin K, Church E, Coltrin M, Daly J, Deguzman A, Dubisher R, Eckart D, Ellis D, Falkenstern P, Fisher A, Fisher M. E, Fleming P, Fortney K, Francis S, Freund S, Gonzales S, Haas P, Hasten A, Hauf D, Hilbert A, Howell D, Jaen F, Jayakody N, Jenkins M, Johnson K, Lefevre M, Ma H, Mario C, Martin K, May C, McGee M, Miller B, Miller C, Miller G, Mirfakhrai A, Muhle E, Norman C, Olds R, Parish C, Ryle M, Schmitzer M, Sherman P, Skeen M, Susak M, Sutter B, Tran Q, Welch C, Witherspoon R, Wood J, Zareski J, Arvizu-Jakubicki M, Asphaug E, Audi E, Ballouz R-L, Bandrowski R, Becker K. J, Becker T. L, Bendall S, Bennett C. A, Bloomenthal H, Blum D, Boynton W. V, Brodbeck J, Burke K. N, Chojnacki M, Colpo A, Contreras J, Cutts J, Dean D, Diallo B, Drinnon D, Drozd K, Enos H. L, Enos R, Fellows C, Ferro T, Fisher M. R, Fitzgibbon G, Fitzgibbon M, Forelli J, Forrester T, Galinsky I, Garcia R, Gardner A

    NATURE COMMUNICATIONS   Vol. 10   2019.3

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    DOI: 10.1038/s41467-019-09213-x

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  104. Hayabusa2-Sample return and kinetic impact mission to near-earth asteroid Ryugu Reviewed

    Tsuda Yuichi, Yoshikawa Makoto, Saiki Takanao, Nakazawa Satoru, Watanabe Sei-ichiro

    ACTA ASTRONAUTICA   Vol. 156   page: 387 - 393   2019.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.actaastro.2018.01.030

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  105. High porosity nature of the top-shape C-type asteroid 162173 Ryugu as observed by Hayabusa2

    S. Watanabe, M. Hirabayashi, Naru Hirata, Naoyuki Hirata, R. Noguchi, Y. Shimaki, H. Ikeda, E. Tatsumi, M. Yoshikawa, S. Kikuchi, H. Yabuta, T. Nakamura, S. Tachibana, Y. Ishihara, T. Morota, K. Kitazato, N. Sakatani, K. Matsumoto, K. Wada, H. Senshu, C. Honda, T. Michikami, H. Takeuchi, T. Kouyama, R. Honda, S. Kameda, T. Fuse, H. Miyamoto, G. Komatsu, S. Sugita, T. Okada, N. Namiki, M. Arakawa, M. Ishiguro, M. Abe, R. Gaskell, E. Palmer, O. S. Barnouin, P. Michel, A. S. French, J. W. McMahon, D. J. Scheeres, P. A. Abell, Y. Yamamoto, S. Tanaka, K. Shirai, M. Matsuoka, M. Yamada, Y. Yokota, H. Suzuki, K. Yoshioka, Y. Cho, S. Tanaka, N. Nishikawa, T. Sugiyama, H. Kikuchi, R. Hemmi, T. Yamaguchi, N. Ogawa, G. Ono, Y. Mimasu, K. Yoshikawa, T. Takahashi, Y. Takei, A. Fujii, C. Hirose, T. Iwata, M. Hayakawa, S. Hosoda, O. Mori, H. Sawada, T. Shimada, S. Soldini, H. Yano, R. Tsukizaki, M. Ozaki, Y. Iijima, K. Ogawa, M. Fujimoto, T.-M. Ho, A. Moussi, R. Jaumann, J.-P. Bibring, C. Krause, F. Terui, T. Saiki, S. Nakazawa, Y. Tsuda

    Proceedings of Lunar and Planetary Science Conference   Vol. 50   page: 1265   2019.3

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    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)  

  106. Thermal Imaging of C-Type Near Earth Asteroid 162173 Ryugu by Thermal Imfrared Imager TIR on Hayabusa2

    Okada, T, Fukuhara, T, Tanaka, S, Taguchi, M, Arai, T, Sakatani, N, Shimaki, Y, Senshu, H, Ogawa, Y, Demura, H, Suko, K, Kitazato, K, Kouyama, T, Sekiguchi, T, Takita, J, Hasegawa, S, Matsunaga, T, Wada, T, Imamura, T, Helbert, J, Mueller, T. G, Hagermann, A, Biele, J, Grott, M, Hamm, M, Delbo, M, Yamamoto, Y, Hirata, N, Hirata, N, Terui, F, Saiki, T, Nakazawa, S, Yoshikawa, M, Watanabe, S, Tsuda, Y

    50th Lunar and Planetary Science Conference   Vol. 2132   page: 1325 - 1326   2019.3

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:The Lunar and Planetary Institute  

  107. The evolution of Ryugu's parent body constrained by Hayabusa2 imaging observations

    S. Sugita, R. Honda, T. Morota, S. Kameda, E. Tatsumi, C. Honda, Y. Yokota, M. Yamada, T. Kouyama, N. Sakatani, H. Suzuki, K. Yoshioka, Y. Cho, M. Matsuoka, K. Ogawa, D. Domingue, H. Miyamoto, O. S. Barnouin, P. Michel, C. M. Ernst, T. Hiroi, T. Nakamura, H. Sawada, M. Hayakawa, N. Hirata, N. Hirata, H.Kikuchi, R. Hemmi, T. Michikami, E. Palmer, R. Gaskell, M.Hirabayashi, R. Jaumann, K. Otto, N. Schmitz, S. E. Schröder, G. Komatsu, S. Tanaka, K. Shirai, M. Yoshikawa, S. Watanabe, Y. Tsuda

    Proceedings of Lunar and Planetary Science Conference     2019.3

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  108. Landing site selection and landing dispersion analysis for the Hayabusa2 mission Reviewed

    S. Kikuchi, T. Saiki, F. Terui, Y. Takei, K. Yoshikawa, N. Ogawa, G. Ono, Y. Mimasu, H. Sawada, N. Shibata, T. Morota, N. Hirata, N. Hirata, T. Michikami, C. Honda, Y. Yokota, H. Yabuta, M. Yoshikawa, S. Watanabe, Y. Tsuda

    Proceedings of the International Astronautical Congress, IAC   Vol. 2019-October   2019

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    One of the primary operations in the Hayabusa2 mission is touchdown on the asteroid Ryugu, which was successfully performed on February 21st, 2019. Because of the abundance of boulders on the asteroid surface, it was challenging to guarantee a safe and secure landing. To identify a promising landing site and design a feasible landing trajectory even under such a situation, this research develops detailed site selection and dispersion analysis strategies. The dispersion of the landing points is computed by a Monte Carlo simulation. Moreover, the distributions of landing conditions, such as a surface contact angle and a clearance distance, are analyzed, validating the feasibility of the touchdown operation. Consequently, a circular area with a radius of 3 m was selected as a safe landing site, leading to the successful landing.

    Scopus

  109. Publisher Correction: Craters, boulders and regolith of (101955) Bennu indicative of an old and dynamic surface (Nature Geoscience, (2019), 10.1038/s41561-019-0326-6) Reviewed International coauthorship

    Walsh, K.J., Jawin, E.R., Ballouz, R.-L., Barnouin, O.S., Bierhaus, E.B., Connolly, H.C., Molaro, J.L., McCoy, T.J., Delbo’, M., Hartzell, C.M., Pajola, M., Schwartz, S.R., Trang, D., Asphaug, E., Becker, K.J., Beddingfield, C.B., Bennett, C.A., Bottke, W.F., Burke, K.N., Clark, B.C., Daly, M.G., DellaGiustina, D.N., Dworkin, J.P., Elder, C.M., Golish, D.R., Hildebrand, A.R., Malhotra, R., Marshall, J., Michel, P., Nolan, M.C., Perry, M.E., Rizk, B., Ryan, A., Sandford, S.A., Scheeres, D.J., Susorney, H.C.M., Thuillet, F., Lauretta, D.S., Highsmith, D.E., Small, J., Vokrouhlický, D., Bowles, N.E., Brown, E., Hanna, K.L.D., Warren, T., Brunet, C., Chicoine, R.A., Desjardins, S., Gaudreau, D., Haltigin, T., Millington-Veloza, S., Rubi, A., Aponte, J., Gorius, N., Lunsford, A., Allen, B., Grindlay, J., Guevel, D., Hoak, D., Hong, J., Schrader, D.L., Bayron, J., Golubov, O., Sánchez, P., Stromberg, J., Hirabayashi, M., Hartzell, C.M., Oliver, S., Rascon, M., Harch, A., Joseph, J., Squyres, S., Richardson, D., Emery, J.P., McGraw, L., Ghent, R., Binzel, R.P., Asad, M.M.A., Johnson, C.L., Philpott, L., Susorney, H.C.M., Cloutis, E.A., Hanna, R.D., Connolly, H.C., Ciceri, F., Hildebrand, A.R., Ibrahim, E.-M., Breitenfeld, L., Glotch, T., Rogers, A.D., Clark, B.E., Ferrone, S., Thomas, C.A., Campins, H., Fernandez, Y., Chang, W., Cheuvront, A., Trang, D., Tachibana, S., Yurimoto, H., Brucato, J.R., Poggiali, G., Pajola, M., Dotto, E., Epifani, E.M., Crombie, M.K., Lantz, C., Izawa, M.R.M., de Leon, J., Licandro, J., Garcia, J.L.R., Clemett, S., Thomas-Keprta, K., Van wal, S., Yoshikawa, M., Bellerose, J., Bhaskaran, S., Boyles, C., Chesley, S.R., Elder, C.M., Farnocchia, D., Harbison, A., Kennedy, B., Knight, A., Martinez-Vlasoff, N., Mastrodemos, N., McElrath, T., Owen, W., Park, R., Rush, B., Swanson, L., Takahashi, Y., Velez, D., Yetter, K., Thayer, C., Adam, C., Antreasian, P., Bauman, J., Bryan, C., Carcich, B., Corvin, M., Geeraert, J., Hoffman, J., Leonard, J.M., Lessac-Chenen, E., Levine, A., McAdams, J., McCarthy, L., Nelson, D., Page, B., Pelgrift, J., Sahr, E., Stakkestad, K., Stanbridge, D., Wibben, D., Williams, B., Williams, K., Wolff, P., Hayne, P., Kubitschek, D., Barucci, M.A., Deshapriya, J.D.P., Fornasier, S., Fulchignoni, M., Hasselmann, P., Merlin, F., Praet, A., Bierhaus, E.B., Billett, O., Boggs, A., Buck, B., Carlson-Kelly, S., Cerna, J., Chaffin, K., Church, E., Coltrin, M., Daly, J., Deguzman, A., Dubisher, R., Eckart, D., Ellis, D., Falkenstern, P., Fisher, A., Fisher, M.E., Fleming, P., Fortney, K., Francis, S., Freund, S., Gonzales, S., Haas, P., Hasten, A., Hauf, D., Hilbert, A., Howell, D., Jaen, F., Jayakody, N., Jenkins, M., Johnson, K., Lefevre, M., Ma, H., Mario, C., Martin, K., May, C., McGee, M., Miller, B., Miller, C., Miller, G., Mirfakhrai, A., Muhle, E., Norman, C., Olds, R., Parish, C., Ryle, M., Schmitzer, M., Sherman, P., Skeen, M., Susak, M., Sutter, B., Tran, Q., Welch, C., Witherspoon, R., Wood, J., Zareski, J., Arvizu-Jakubicki, M., Asphaug, E., Audi, E., Ballouz, R.-L., Bandrowski, R., Becker, K.J., Becker, T.L., Bendall, S., Bennett, C.A., Bloomenthal, H., Blum, D., Boynton, W.V., Brodbeck, J., Burke, K.N., Chojnacki, M., Colpo, A., Contreras, J., Cutts, J., Drouet d’Aubigny, C.Y., Dean, D., DellaGiustina, D.N., Diallo, B., Drinnon, D., Drozd, K., Enos, H.L., Enos, R., Fellows, C., Ferro, T., Fisher, M.R., Fitzgibbon, G., Fitzgibbon, M., Forelli, J., Forrester, T., Galinsky, I., Garcia, R., Gardner, A., Golish, D.R., Habib, N., Hamara, D., Hammond, D., Hanley, K., Harshman, K., Hergenrother, C.W., Herzog, K., Hill, D., Hoekenga, C., Hooven, S., Howell, E.S., Huettner, E., Janakus, A., Jones, J., Kareta, T.R., Kidd, J., Kingsbury, K., Balram-Knutson, S.S., Koelbel, L., Kreiner, J., Lambert, D., Lauretta, D.S., Lewin, C., Lovelace, B., Loveridge, M., Lujan, M., Maleszewski, C.K., Malhotra, R., Marchese, K., McDonough, E., Mogk, N., Morrison, V., Morton, E., Munoz, R., Nelson, J., Nolan, M.C., Padilla, J., Pennington, R., Polit, A., Ramos, N., Reddy, V., Riehl, M., Rizk, B., Roper, H.L., Salazar, S., Schwartz, S.R., Selznick, S., Shultz, N., Smith, P.H., Stewart, S., Sutton, S., Swindle, T., Tang, Y.H., Westermann, M., Wolner, C.W.V., Worden, D., Zega, T., Zeszut, Z., Bjurstrom, A., Bloomquist, L., Dickinson, C., Keates, E., Liang, J., Nifo, V., Taylor, A., Teti, F., Caplinger, M., Bowles, H., Carter, S., Dickenshied, S., Doerres, D., Fisher, T., Hagee, W., Hill, J., Miner, M., Noss, D., Piacentine, N., Smith, M., Toland, A., Wren, P., Bernacki, M., Munoz, D.P., Watanabe, S., Sandford, S.A., Aqueche, A., Ashman, B., Barker, M., Bartels, A., Berry, K., Bos, B., Burns, R., Calloway, A., Carpenter, R., Castro, N., Cosentino, R., Donaldson, J., Dworkin, J.P., Cook, J.E., Emr, C., Everett, D., Fennell, D., Fleshman, K., Folta, D., Gallagher, D., Garvin, J., Getzandanner, K., Glavin, D., Hull, S., Hyde, K., Ido, H., Ingegneri, A., Jones, N., Kaotira, P., Lim, L.F., Liounis, A., Lorentson, C., Lorenz, D., Lyzhoft, J., Mazarico, E.M., Mink, R., Moore, W., Moreau, M., Mullen, S., Nagy, J., Neumann, G., Nuth, J., Poland, D., Reuter, D.C., Rhoads, L., Rieger, S., Rowlands, D., Sallitt, D., Scroggins, A., Shaw, G., Simon, A.A., Swenson, J., Vasudeva, P., Wasser, M., Zellar, R., Grossman, J., Johnston, G., Morris, M., Wendel, J., Burton, A., Keller, L.P., McNamara, L., Messenger, S., Nakamura-Messenger, K., Nguyen, A., Righter, K., Queen, E., Bellamy, K., Dill, K., Gardner, S., Giuntini, M., Key, B., Kissell, J., Patterson, D., Vaughan, D., Wright, B., Gaskell, R.W., Le Corre, L., Li, J.-Y., Molaro, J.L., Palmer, E.E., Siegler, M.A., Tricarico, P., Weirich, J.R., Zou, X.-D., Ireland, T., Tait, K., Bland, P., Anwar, S., Bojorquez-Murphy, N., Christensen, P.R., Haberle, C.W., Mehall, G., Rios, K., Franchi, I., Rozitis, B., Beddingfield, C.B., Marshall, J., Brack, D.N., French, A.S., McMahon, J.W., Scheeres, D.J., Jawin, E.R., McCoy, T.J., Russell, S., Killgore, M., Bottke, W.F., Hamilton, V.E., Kaplan, H.H., Walsh, K.J., Bandfield, J.L., Clark, B.C., Chodas, M., Lambert, M., Masterson, R.A., Daly, M.G., Freemantle, J., Seabrook, J.A., Barnouin, O.S., Craft, K., Daly, R.T., Ernst, C., Espiritu, R.C., Holdridge, M., Jones, M., Nair, A.H., Nguyen, L., Peachey, J., Perry, M.E., Plescia, J., Roberts, J.H., Steele, R., Turner, R., Backer, J., Edmundson, K., Mapel, J., Milazzo, M., Sides, S., Manzoni, C., May, B., Delbó, M., Libourel, G., Michel, P., Ryan, A., Thuillet, F., Marty, B.

    Nature Geoscience   Vol. 12 ( 5 ) page: 399 - 399   2019

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    © 2019, Springer Nature Limited. In the version of this Article originally published, in the sentence “There are three identified boulders with long axes exceeding 40 m and more than 200 boulders larger than 10 m2”, the term “10 m2” should have been “10 m (ref.2)”. This has now been corrected.

    DOI: 10.1038/s41561-019-0360-4

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  110. Cruise status of Hayabusa2: Round trip mission to asteroid 162173 Ryugu Reviewed

    Yuichi Tsuda, Sei-ichiro Watanabe, Takanao Saiki, Makoto Yoshikawa, Satoru Nakazawa

    ACTA ASTRONAUTICA   Vol. 136   page: 176 - 181   2017.7

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    The Japan Aerospace Exploration Agency launched an asteroid sample return spacecraft "Hayabusa2" on December 3, 2014 by the Japanese H2A launch vehicle. Hayabusa2 aims at the round trip mission to the asteroid 162173 Ryugu. Hayabusa2 successfully conducted the Earth gravity assist on December 3, 2015, and now the spacecraft is flying toward Ryugu with the microwave discharge ion engine as the means of propulsion. As of September 2016, 1346 h of the ion engine operation has been achieved as planned. Three touch downs/sample collections, one kinetic impact/crater generation, four surface rovers deployment and many other in-situ observations are planned in the asteroid proximity phase. The operation team will perform extensive operation practice/rehearsal using a hardware-in-the-loop simulator in the year 2017 to be ready for the asteroid arrival in the summer 2018.

    DOI: 10.1016/j.actaastro.2017.03.015

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  111. The Camera of the MASCOT Asteroid Lander on Board Hayabusa 2 Reviewed International coauthorship

    R. Jaumann, N. Schmitz, A. Koncz, H. Michaelis, S. E. Schroeder, S. Mottola, F. Trauthan, H. Hoffmann, T. Roatsch, D. Jobs, J. Kachlicki, B. Pforte, R. Terzer, M. Tschentscher, S. Weisse, U. Mueller, L. Perez-Prieto, B. Broll, A. Kruselburger, T. -M. Ho, J. Biele, S. Ulamec, C. Krause, M. Grott, J. -P. Bibring, S. Watanabe, S. Sugita, T. Okada, M. Yoshikawa, H. Yabuta

    SPACE SCIENCE REVIEWS   Vol. 208 ( 1-4 ) page: 375 - 400   2017.7

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    The MASCOT Camera (MasCam) is part of the Mobile Asteroid Surface Scout (MASCOT) lander's science payload. MASCOT has been launched to asteroid (162173) Ryugu onboard JAXA's Hayabusa 2 asteroid sample return mission on Dec 3rd, 2014. It is scheduled to arrive at Ryugu in 2018, and return samples to Earth by 2020. MasCam was designed and built by DLR's Institute of Planetary Research, together with Airbus-DS Germany. The scientific goals of the MasCam investigation are to provide ground truth for the orbiter's remote sensing observations, provide context for measurements by the other lander instruments (radiometer, spectrometer and magnetometer), the orbiter sampling experiment, and characterize the geological context, compositional variations and physical properties of the surface (e.g. rock and regolith particle size distributions). During daytime, clear filter images will be acquired. During night, illumination of the dark surface is performed by an LED array, equipped with 4 x 36 monochromatic light-emitting diodes (LEDs) working in four spectral bands. Color imaging will allow the identification of spectrally distinct surface units. Continued imaging during the surface mission phase and the acquisition of image series at different sun angles over the course of an asteroid day will contribute to the physical characterization of the surface and also allow the investigation of time-dependent processes and to determine the photometric properties of the regolith. The MasCam observations, combined with the MASCOT hyperspectral microscope (MMEGA) and radiometer (MARA) thermal observations, will cover a wide range of observational scales and serve as a strong tie point between Hayabusa 2's remote-sensing scales (10(3)-10(-3) m) and sample scales (10(-3)-10(-6) m). The descent sequence and the close-up images will reveal the surface features over a broad range of scales, allowing an assessment of the surface's diversity and close the gap between the orbital observations and those made by the in-situ measurements. The MasCam is mounted inside the lander slightly tilted, such that the center of its 54.8 degrees square field-of-view is directed towards the surface at an angle of 22 degrees with respect to the surface plane. This is to ensure that both the surface close to the lander and the horizon are observable. The camera optics is designed according to the Scheimpflug principle, thus that the entire scene along the camera's depth of field (150 mm to infinity) is in focus. The camera utilizes a 1024 x 1024 pixel CMOS sensor sensitive in the 400-1000 nm wavelength range, peaking at 600-700 nm. Together with the f-16 optics, this yields a nominal ground resolution of 150 micron/px at 150 mm distance (diffraction limited). The camera flight model has undergone standard radiometric and geometric calibration both at the component and system (lander) level. MasCam relies on the use of wavelet compression to maximize data return within stringent mission downlink limits. All calibration and flight data products will be generated and archived in the Planetary Data System in PDS image format.

    DOI: 10.1007/s11214-016-0263-2

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  112. NIRS3: The Near Infrared Spectrometer on Hayabusa2 Reviewed International coauthorship

    Iwata Takahiro, Kitazato Kohei, Abe Masanao, Ohtake Makiko, Arai Takehiko, Arai Tomoko, Hirata Naru, Hiroi Takahiro, Honda Chikatoshi, Imae Naoya, Komatsu Mutsumi, Matsunaga Tsuneo, Matsuoka Moe, Matsuura Shuji, Nakamura Tomoki, Nakato Aiko, Nakauchi Yusuke, Osawa Takahito, Senshu Hiroki, Takagi Yasuhiko, Tsumura Kohji, Takato Naruhisa, Watanabe Sei-ichiro, Barucci Maria Antonietta, Palomba Ernesto, Ozaki Masanobu

    SPACE SCIENCE REVIEWS   Vol. 208 ( 1-4 ) page: 317 - 337   2017.7

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    NIRS3: The Near Infrared Spectrometer is installed on the Hayabusa2 spacecraft to observe the target C-type asteroid 162173 Ryugu at near infrared wavelengths of 1.8 to 3.2 mu m. It aims to obtain reflectance spectra in order to detect absorption bands of hydrated and hydroxide minerals in the 3 mu m-band. We adopted a linear-image sensor with indium arsenide (InAs) photo diodes and a cooling system with a passive radiator to achieve an optics temperature of 188 K (-85 degrees C), which enables to retaining sufficient sensitivity and noise level in the 3 mu m wavelength region. We conducted ground performance tests for the NIRS3 flight model (FM) to confirm its baseline specifications. The results imply that the properties such as the signal-to-noise ratio (SNR) conform to scientific requirements to determine the degree of aqueous alteration, such as CM or CI chondrite, and the stage of thermal metamorphism on the asteroid surface.

    DOI: 10.1007/s11214-017-0341-0

    Web of Science

  113. Mascot - Preparations for its landing in 2018: A status update from ground and space one year ahead of the landing on ryugu

    Christian Ziach, Volodymyr Baturkin, Christian Grimm, Jan Thimo Grundmann, Tra Mi Ho, Caroline Lange, Kaname Sasaki, Nawarat Termtanasombat, Norbert Toth, Elisabet Wejmo, Maximilian Maier, Josef Reill, Hans Jürgen Sedlmayr, Friederike Wolff, Michael Lange, Olaf Mierheim, Jens Biele, Barbara Cozzoni, Cinzia Fantinati, Koen Geurts, Kagan Kayal, Christian Krause, Oliver Küchemann, Michael Maibaum, Stephan Ulamec, Matthias Grott, Ralf Jaumann, Céline Cénac-Morthe, Muriel Deleuze, Clément Dudal, David Granena, Laurence Lorda, Aurélie Moussi, Jean Pierre Bibring, David Hercik, Hans Ulrich Auster, Yuya Mimasu, Tatsuaki Okada, Takanao Saiki, Sathoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Yamaguchi, Tetsuo Yoshimitsu, Seiichiro Watanabe

    Proceedings of the International Astronautical Congress, IAC   Vol. 5   page: 2897 - 2904   2017

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    © Copyright 2017 by the International Astronautical Federation (IAF). All rights reserved. Launched in December 2014 the Japanese spacecraft Hayabusa2 (HY2) and its small passenger MASCOT (Mobile Asteroid surface SCOuT) have meanwhile successfully performed more than half of their 4-year-long voyage to reach their target body, asteroid (162173) Ryugu, formerly referred to as 1999 JU3. While Hayabusa2 is aiming to characterize Ryugu on a global scale and to return samples to Earth, MASCOT's mission is to land on the surface, perform in-situ investigations and thus provide ground truth and context information for the overall Hayabusa2 science activities. The lander was jointly developed by the German Aerospace Centre (DLR) and the Centre National d'Etudes Spatiales (CNES). It is equipped with a sensor suite of four scientific instruments: a hyperspectral IR spectrometer (MicrOmega, IAS Paris), a camera (MasCam, DLR Berlin), a radiometer (MARA, DLR Berlin) and a magnetometer (MasMag, TU Braunschweig) to investigate Ryugu's surface structure, composition and physical properties including its thermal behaviour and magnetization. The planned on surface sequence of measurements will be repeated in a different site after MASCOT's relocation on the asteroid surface. Therefore a mobility subsystem was developed to make MASCOT jump due to applied angular momentum of an eccentric rotating mass inside the system. Since the characteristics of Ryugu such as the exact orientation of the rotation axis, the thermal conditions, shape and surface structure will be known only after arrival of Hayabusa2 in July 2018 there will be only a few weeks available to select a landing site and refine the specific MASCOT mission parameters according to the conditions found, before the landing can take place, in October 2018. MASCOT's on-asteroid lifetime is limited by the capacity of its primary battery which is the main driver to make maximum use of the given time. In order to prepare MASCOT's operation within these constraints, both, space and ground systems have to be well prepared and descent and on-asteroid phases need to be rigorously planned and tested. This paper will summarize the already performed and planned in-flight activities such as health checks, calibration activities, data transfer tests, and will report on MASCOTs overall health state. Beyond that, all on-ground activities such as the landing site selection process, the verification of operational timelines, planning and training aspects will be outlined.

    Scopus

  114. Phoenix "Hayabusa": A tale of the future (13) —Landing site selection training of Hayabusa2 Mission—

    Ishihara Yoshiaki, Kitazato Kohei, Matsumoto Koji, Yabuta Hikaru, Watanabe Sei-ichiro, Tanaka Satoshi, Yamaguchi Tomohiro, Miura Akira, Yamamoto Yukio, Hirata Naru, Morota Tomokatsu, Sakatani Naoya

    Planetary People - The Japanese Society for Planetary Sciences   Vol. 26 ( 4 ) page: 139 - 143   2017

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    DOI: 10.14909/yuseijin.26.4_139

  115. Flight status of robotic asteroid sample return mission Hayabusa2 Reviewed

    Tsuda, Y., S. Nakazawa, K. Kushiki, M. Yoshikawa, H. Kuninaka, S. Watanabe

    Acta Astronautica   Vol. 127   page: 702 - 709   2016

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  116. Hayabusa-2: Scientific importance of samples returned from near-Earth C-type asteroid 1999 JU3 Invited Reviewed

    S. Tachibana, M. Abe, M. Arakawa, M. Fujimoto, Y. Iijima, M. Ishiguro, K. Kitazato, N. Kobayashi, N. Namiki, T. Okada, R. Okazaki, H. Sawada, S. Sugita, Y. Takano, S. Tanaka, S. Watanabe, M. Yoshikawa, H. Kuninaka, the Hayabusa2 project team

    Geochemical Journal   Vol. 48 ( 6 ) page: 571 - 587   2014.12

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    DOI: doi:10.2343/geochemj.2.0350

  117. Visible-wavelength spectroscopy of subkilometer-sized near-Earth asteroids with a low delta-v Reviewed

    D. Kuroda, M. Ishiguro, N. Takato, S. Hasegawa, M. Abe, Y. Tsuda, S. Sugita, F. Usui, T. Hattori, I. Iwata, M. Imanishi, H. Terada, Y-J. Choi, S. Watanabe, M. Yoshikawa

    Publications of the Astronomical Society of Japan   Vol. 66 ( 3 ) page: #51   2014.6

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    DOI: 10.1093/pasj/psu041

  118. Hayabusa2 - The Next Asteroid Sample Return Mission of Japan Reviewed

    Makoto Yoshikawa, Sei-ichiro Watanabe, Yuichi Tsuda, Hitoshi Kuninaka, Hayabusa2 Project Team

    Transactions of JSASS Space Technology Japan   Vol. 12 ( 29 ) page: Tk_29-Tk_33   2014

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  119. 火の鳥「はやぶさ」未来編 その1~小惑星探査からの惑星科学~ Invited

    渡邊誠一郎,はやぶさ2プロジェクトチーム

    日本惑星科学会誌 遊・星・人   Vol. 22 ( 1 ) page: 23 - 31   2013.3

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  120. Sublimation temperature of circumstellar dust particles and its importance for dust ring formation Reviewed

    Hiroshi Kobayashi, Hiroshi Kimura, Sei-ichiro Watanabe, Tetsuo Yamamoto, and Sebastian M¨uller

    Earth Planets Space   Vol. 63   page: 1067   2011.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: doi:10.5047/eps.2011.03.012

  121. Ice sublimation of dust particles and their detection in the outer solar system Reviewed

    Hiroshi Kobayashi, Hiroshi Kimura, Satoru Yamamoto, Sei-ichiro Watanabe, Tetsuo Yamamoto

    Earth Planets Space   Vol. 62   page: 57-61   2010.2

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  122. Thermally induced waves in protoplanetary disks and their implication for planetary formation Reviewed

    Sei-ichiro Watanabe and D.N.C. Lin

    "Exoplanets and Disks: Their Formation and Diversity", AIP Conference Proceedings   Vol. 1158   page: 27-30   2009.8

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  123. Size distribution of dust grains in vortices in a protoplanetary disk

    Eri Kawamura and Sei-ichiro Watanabe

    "Exoplanets and Disks: Their Formation and Diversity", AIP Conference Proceedings   Vol. 1158   page: 133-134   2009.8

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  124. Numerical simulation of dust Circulation in protoplanetary disks

    Daisuke Fujiwara and Sei-ichiro Watanabe

    In "Exoplanets and Disks: Their Formation and Diversity", AIP Conference Proceedings   Vol. 1158   page: 123-124   2009.8

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  125. Thermal instability of irradiation-dominated protoplanetary disks.

      Vol. 384   page: e-book (in press)   2008.4

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  126. 「惑星」ではない<惑星>たち Reviewed

    渡邊誠一郎

    日本惑星学会誌 遊・星・人   Vol. 17 ( 1 ) page: 38-40   2008.3

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  127. 太陽系はどのようにしてできたのか Invited

    渡邊誠一郎

    科学(岩波書店)   Vol. 77 ( 2 ) page: 162 - 166   2007.2

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  128. Dust circulation by radiation pressure in protoplanetary disks with puffed-up inner rim.

    Fujiwara, D., S. Watanabe

    Proceedings of ISAS Lunar and Planetary Symposium   Vol. 38   page: 124-127   2006.3

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  129. Numerical simulations of frictional melting: Small dependence of shear stress drop on viscosity parameters. Reviewed

    Sirono, S., Satomi, K., S. Watanabe

      Vol. 111   page: B06309 doi:10.1029/2005JB003858   2006

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  130. Dust circulation in the protoplanetary disks and formation of planetesimals

    Watanabe, S.

    Proceedings of Protostars and Planets V     page: #8122 (CD-ROM)   2005.10

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  131. Migration mechanism of proto-Neptune

    Takahashi, K., and Watanabe, S.

    Proceedings of Protostars and Planets V     page: #8299 (CD-ROM)   2005.10

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  132. Effect of an early stellar encounter on outer planetary system

    Kobayashi, H., Ida, S., Tanaka, H., and Watanabe, S.

    Proceedings of Protostars and Planets V     page: #8294 (CD-ROM)   2005.10

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  133. Numerical simulation of dust circulation in protoplanetary disks

    Fujiwara, D., and Watanabe, S.

    Proceedings of Protostars and Planets V     page: #8237 (CD-ROM)   2005.10

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  134. Numerical simulations of dust circulation in protoplanetary disks

    Fujiwata, D., S. Watanabe

      Vol. 37   page: 73-76   2004.12

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  135. Numerical simulation of mid-ocean ridge hydrothermal circulation including the phase separation of seawater Reviewed

    Kawada, Y., S. Yoshida, S. Watanabe

    Earth Planets Space   Vol. 56   page: 193 - 215   2004

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  136. Gas capturing growth of gas-giant planets via subdisk accretion in protoplanetary disk

    Tanigawa, T., and Watanabe, S.

    Scientific Frontiers in Research on Extrasolar Planets, Astronomical Society of the Pacific Conference Series   Vol. 294   page: 303-306   2003

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  137. 巨大ガス惑星へのガス降着流 Reviewed

    谷川 享行,渡邊 誠一郎

    日本惑星学会誌 遊・星・人   Vol. 11 ( 2 ) page: 87 - 93   2002

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  138. Experimental investigation of shock wave attenuation in basalt Reviewed

    Nakazawa Satoru, Watanabe Sei-ichiro, Iijima Yu-ichi, Kato Manabu

    Icarus   Vol. 156 ( 2 ) page: 539 - 550   2002

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    DOI: 10.1006/icar.2001.6729

  139. Two types of co-accretion scenarios for the origin of the Moon Reviewed

    Morishima Ryuji, Watanabe Sei-ichiro

    Earth Planets Space   Vol. 53   page: 213 - 231   2001

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  140. Kinetic theory of steady chemical nucleation in the gas phase Reviewed

    T. Yamamoto, T. Chigai, S. Watanabe, T. Kozasa

    Astronomy and Astrophysics   Vol. 380   page: 373 - 383   2001

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    DOI: 10.1051/0004-6361:20011391

  141. Continuous Growth of Autocatalytic Sets Reviewed

    Shigenobu Mitsuzawa, Sei-ichiro Watanabe

    Bio Systems   Vol. 59   page: 61 - 69   2001

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  142. Continuous monitoring of fumarolic gas flux at a bore hole in an active volcanic island Reviewed

    Geophysical Research Letters   Vol. 27   page: 1539 - 1542   2000

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  143. umerical simulations of dust-gas 2-phase flows in the solar nebula Invited

    Watanabe, S., and Yamada, T.

    EOS Trans.   Vol. 81 ( 22 ) page: AGUWestern Pacific Geophysics Meet. Suppl., P51A 04   2000

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  144. A self-organized model of earthquakes with constant stress drops and the b-value of 1. Reviewed

    Hiroyuki Kumagai, Yoshio Fukao, Sei‐ichiro Watanabe, Yuito Baba

    Geophysical Research Letters   Vol. 26   page: 2817   1999

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  145. 比較惑星系形成論への展望 Invited Reviewed

    渡邊誠一郎

    遊・星・人   Vol. 8 ( 3 ) page: 163 - 173   1999

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  146. Comparative theory of planetary-system formation: Formation of gaseousplanets and evolutions thereafter

    Proc. ISAS Lunar and Planet. Sympo.   Vol. 32   page: 133-136   1999

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  147. Evaporation of Fe and FeS dust in the active stage of the primordial solar nebula, and Fe/S fractionation. Reviewed

    Shogo Tachibana, Akira Tsuchiyama, Sei-ichiro Watanabe

    Antarctic Meteorite Research   Vol. 12   page: 213   1999

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  148. Numerical simulation of dust-gas 2-phase flows in the Solar nebula

    Proc. ISAS Lunar and Planet. Sympo.   Vol. 32   page: 109-112   1999

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  149. Shock attenuation and stress distribution induced by hypervelocity impact

    Proc. ISAS Lunar and Planet. Sympo.   Vol. 32   page: 105-108   1999

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  150. Accretion subdisks around protoplanets in protoplanetary disks

    Tanigawa, T., and Watanabe, S.

    Star Formation 1999     page: 253-254   1999

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  151. Nebular gas flows around a protoplanet

    Proceedings of the ISAS Lunar and Planetary Symposium   Vol. 31   page: 176-179   1998

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  152. Co-accretional evolution of planet-satellite systems

    Proceedings of the ISAS Lunar and Planetary Symposium   Vol. 31   page: 180-183   1998

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  153. The stop of mass infall from the molecular cloud core by jet

    Proceedings of ISAS Lunar and Planetary Symposium   Vol. 29   page: 144-147   1996.12

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  154. 惑星形成論から見た生命の誕生 Invited

    渡邊誠一郎

    月刊地球   Vol. 18 ( 1 ) page: 51   1996.1

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  155. Collision probabilities of planet/satellite systems with planetesimals.

    Proceedings of ISAS Lunar and Planetary Symposium   Vol. 29   page: 135-138   1996

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  156. Behavior of Dust Grains in Protoplanetary Disks with Bipolar Outflows

    Proceedings of ISAS lunar and planetary symposium   Vol. 27   page: 83   1994.12

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  157. 理論的立場からみた太陽系星雲の熱進化 Invited

    渡邊誠一郎

    惑星科学   Vol. 9   page: 50-57   1992

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  158. 太陽系星雲の形成と進化 Invited

    渡邊誠一郎

    天文月報   Vol. 84   page: 202-206   1991

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▼display all

Books 7

  1. シリーズ現代の天文学第9巻『太陽系と惑星』第2版 6.1節,6.3節

    渡部潤一他編6.1節,6.3節著者:渡邊誠一郎( Role: Contributor ,  6.1節,6.3節)

    日本評論社  2021.9  ( ISBN:978-4-8158-0590-6

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    Total pages:341   Language:Japanese

  2. 『地球・惑星・生命』 第2章 太陽系小天体探査と「はやぶさ2」 Reviewed

    渡邊誠一郎( Role: Contributor ,  第2章 太陽系小天体探査と「はやぶさ2」)

    東京大学出版会  2020.5  ( ISBN:978-4-13-063715-2

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    Total pages:264   Responsible for pages:23-33   Language:Japanese Book type:Textbook, survey, introduction

  3. Clinical Environmental Studies

    Sei-ichiro Watanabe, Takeshi Nakatsuka, Tomohiro Oh( Role: Joint editor)

    Nagoya University Press  2014.9  ( ISBN:978-4-8158-0781-8

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    Language:Japanese Book type:Textbook, survey, introduction

  4. 新しい地球学―太陽-地球-生命圏相互作用系の変動学―

    渡邊誠一郎,檜山哲哉,安成哲三 (編)( Role: Joint editor)

    名古屋大学出版会  2008.3 

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    地球は太陽からのエネルギーで生命圏を維持するが、一方生命圏は地球に能動的影響を与える。サブシステム間の相互作用・フィードバックの理解が、新しい地球像の構築には必須である。本書はこのシームレスなシステムの過去と現在を、観測・モデルの両面から把握する先駆的テキスト。

  5. シリーズ現代の天文学第9巻『太陽系と惑星』6.1節,6.3節

    渡部潤一他編6.1節,6.3節著者:渡邊誠一郎( Role: Contributor ,  6.1節,6.3節)

    日本評論社  2008.2  ( ISBN:978-4-8158-0590-6

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    Total pages:341   Language:Japanese

  6. 比較惑星学,第3章

    松井孝典,永原裕子,藤原顕,渡邊誠一郎,井田茂,阿部豊,中村正人,小松吾郎,山本哲生第3章著者:渡邊誠一郎,井田茂( Role: Joint author)

    岩波書店  1997.3 

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    Language:Japanese

    第3章「比較惑星系形成論」を井田茂と共同執筆した.

  7. 惑星の科学,第5章

    阿部豊,森山茂,藤村彰夫,杉浦直治,中川義次,渡邊誠一郎第5章著者:中川義次,渡邊誠一郎( Role: Joint author)

    朝倉書店  1993.9 

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    第5章「惑星系の起源」を中川義次と共同執筆した.

▼display all

MISC 37

  1. 特集 はやぶさ2の帰還:小惑星リュウグウの素顔 Invited

    中島林彦,渡邊誠一郎

    日経サイエンス     2021.2

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)  

  2. Results of initial descriptions for samples returned from Ryugu

    矢田達, 安部正真, 安部正真, 岡田達明, 岡田達明, 中藤亜衣子, 与賀田佳澄, 宮崎明子, 熊谷和也, 畠田健太朗, 西村征洋, 人見勇矢, 副島広道, 吉武美和, 吉武美和, 岩前絢子, 岩前絢子, 古屋静萌, 古屋静萌, 臼井寛裕, 林佑, 山本大貴, 深井稜汰, 杉田精司, 長勇一郎, 湯本航生, 矢部佑奈, BIBRING Jean-Pierre, PILORGET Cedric, HAMM Vincent, BRUNETTO Rosario, RIU Lucie, RIU Lucie, 橘省吾, 橘省吾, 澤田弘崇, 岡崎隆司, 高野淑識, 坂本佳奈子, 三浦弥生, 矢野創, IRELAND Trevor, 山田哲哉, 藤本正樹, 中澤暁, 田中智, 佐伯孝尚, 吉川真, 渡邊誠一郎, 津田雄一

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2021   2021

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  3. Hayabusa2 Science Achievement Digest

    吉川真, 渡邊誠一郎, 杉田精司, 並木則行, 北里宏平, 田中智, 荒川政彦, 橘省吾, 岡田達明, 出村裕英, 池田人, 石黒正晃, 山本幸生, 藤田和央, 安部正真, 臼井寛裕, JAUMANN Ralf, BIBRING Jean-Pierre, GROTT Matthias, GLASSMEIER Karl-Heinz, HELBERT Joern, HO Tra-Mi, SOFFYS Aurelie Moussi, 中澤暁, 津田雄一

    宇宙科学技術連合講演会講演集(CD-ROM)   Vol. 65th   2021

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  4. はやぶさ2探査と微惑星形成

    渡邊誠一郎, 安部正真, 諸田智克, 道上達弘, 平田直之, 平田成, 嶌生有理, 杉田精司, 岡田達明, 北里宏平, 竝木則行, 橘省吾, 橘省吾, 荒川政彦, 田中智

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2021   2021

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  5. はやぶさ2のリュウグウ近傍観測の科学成果

    渡邊誠一郎, 田中智, 吉川真, 杉田精司, 岡田達明, 北里宏平, 竝木則行, 荒川政彦, 橘省吾, 橘省吾, 諸田智克, 杉浦圭祐, 嶌生有理, 平田成, 平田直之

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2020   2020

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  6. Crack Orientations of Boulders and Thermal Fatigue on (162173) Ryugu

    佐々木晶, 神田志穂, 菊地紘, 道上達広, 諸田智克, 本田親寿, 宮本英昭, 逸見良道, 杉田精司, 巽瑛理, 渡邊誠一郎, 竝木則行, 平林正稔, 平田成, 中村智樹, 野口高明, 廣井孝弘, 松本晃治, 野田寛大, 坂谷尚哉, 亀田真吾, 神山徹, 鈴木秀彦, 山田学, 本田理恵, 横田康弘, 長勇一郎, 吉岡和夫, 早川雅彦, 松岡萌, 金丸仁明, 澤田弘崇, 吉川真

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2020   2020

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  7. 火の鳥「はやぶさ」未来編 その20~小惑星リュウグウからのリターンサンプル分析の全体像~

    安部正真, 橘省吾, 小林桂, 伊藤元雄, 渡邊誠一郎

    日本惑星科学会誌 遊・星・人   Vol. 29 ( 1 )   2020

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  8. 小惑星リュウグウ形状モデリングの現状

    平田成, 平田直之, 野口里奈, 嶌生有理, 杉田精司, 松本晃治, 千秋博紀, 山本幸生, 村上真也, 村上真也, 石原吉明, 津田雄一, 渡邊誠一郎, GASKELL Robert, PALMER Eric

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2020   2020

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  9. 小惑星Ryuguに働くYORP効果と自転進化史

    金丸仁明, 佐々木晶, 諸田智克, 長勇一郎, 巽瑛理, 平田成, 千秋博紀, 嶌生有理, 坂谷尚哉, 田中智, 平林正俊, 岡田達明, 臼井寛裕, 杉田精司, 渡邊誠一郎

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2020   2020

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  10. The spatial distribution of impact craters on Ryugu

    Hirata Naoyuki, Morota Tomokatsu, Cho Yuichiro, Kanamaru Masanori, Watanabe Sei-ichiro, Sugita Seiji, Hirata Naru, Yamamoto Yukio, Noguchi Rina, Shimaki Yuri, Tatsumi Eri, Yoshioka Kazuo, Sawada Hirotaka, Yokota Yasuhiro, Sakatani Naoya, Hayakawa Masahiko, Matsuoka Moe, Honda Rie, Kameda Shingo, Yamada Manabu, Kouyama Toru, Suzuki Hidehiko, Honda Chikatoshi, Ogawa Kazunori, Tsuda Yuichi, Yoshikawa Makoto, Saiki Takanao, Tanaka Satoshi, Terui Fuyuto, Nakazawa Satoru, Kikuchi Shota, Yamaguchi Tomohiro, Ogawa Naoko, Ono Go, Mimasu Yuya, Yoshikawa Kent, Takahashi Tadateru, Takei Yuto, Fujii Atsushi, Takeuchi Hiroshi, Okada Tatsuaki, Shirai Kei, Iijima Yu-ichi

    Icarus   ( 338 ) page: 113527 - 113527   2019.11

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    Language:English   Publisher:Elsevier  

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  11. はやぶさ2のリュウグウ滞在記 Invited Reviewed

    渡邊誠一郎

    日本地球惑星科学連合ニュースレター誌   Vol. 15 ( 2 )   2019.5

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (other)  

  12. リュウグウ西バルジの衝突による形成の可能性

    松本晃治, 野田寛大, 石原吉明, 千秋博紀, 竝木則行, 山本圭香, 大坪俊通, 渡邊誠一郎, 平田成, 平田直之, 山本幸生, 尾川順子, 菊地翔太, 佐伯孝尚, 津田雄一

    日本測地学会講演会要旨   Vol. 132nd   2019

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  13. ラブルパイル小惑星リュウグウの形状と起源

    渡邊誠一郎, 渡邊誠一郎, 平林正俊, 平田成, 平田直之, 野口里奈, 嶌生有理, 池田人, 巽瑛理, 吉川真, 菊地翔太, 薮田ひかる, 中村智樹, 橘省吾, 橘省吾, 石原吉明, 諸田智克, 北里宏平, 坂谷尚哉, 松本晃治, 松本晃治, 和田浩二, 千秋博紀, 本田親寿, 道上達広, 竹内央, 神山徹, 本田理恵, GASKELL Robert, PALMER Eric, BARNOUIN Olivier S., MICHEL Patrick, ABELL Paul, 山本幸生, 田中智, 白井慶, 松岡萌, 杉田精司, 杉田精司, 岡田達明, 並木則行, 荒川政彦, 石黒正晃, 小川和律, 照井冬人, 佐伯孝尚, 中澤暁, 津田雄一

    日本地球惑星科学連合大会予稿集(Web)   Vol. 2019   2019

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  14. Landing Site Selection for Hayabusa2: Scientific Evaluation of the Candidate Sites on Asteroid (162173) Ryugu

    YABUTA Hikaru, WATANABE Sei-ichiro, NAKAMURA Tomoki, HIRATA Naru, SUGITA Seiji, OKADA Tatsuaki, KITAZATO Kohei, ISHIHARA Yoshiaki, MOROTA Tomokatsu, SAKATANI Naoya, MATSUMOTO Koji, WADA Koji, TACHIBANA Shogo, KOMATSU Mutsumi, TATSUMI Eri, MATSUOKA Moe, HONDA Chikatoshi, HIROI Takahiro, SENSHU Hiroki, HONDA Rie, YOKOTA Yasuhiro, NOGUCHI Rina, SHIMAKI Yuri, DOMINGUE Deborah Lorin, LE CORRE Lucille, BARUCCI Antonella, PALOMBA Ernest, KIKUCHI Shota, MIURA Akira, YAMAGUCHI Tomohiro, YAMAMOTO Yukio, SAIKI Takanao, TANAKA Satoshi, YOSHIKAWA Makoto, TSUDA Yuichi

    日本地球惑星科学連合大会予稿集(Web)   Vol. 2019   2019

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  15. 火の鳥「はやぶさ」未来編 その17~リュウグウの地名~

    野口里奈, 嶌生有理, 吉川真, 宮本英昭, 小松吾郎, 渡邊誠一郎, 渡邊誠一郎, 石原吉明, 佐々木晶, 平林正俊, 平田成, 本田親寿, 出村裕英, 杉田精司, 津田雄一

    日本惑星科学会誌 遊・星・人   Vol. 28 ( 1 )   2019

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  16. 探査機はやぶさ2のリュウグウ近傍探査の総括

    渡邊誠一郎, 渡邊誠一郎, 吉川真, 田中智, 杉田精司, 竝木則行, 岡田達明, 北里宏平, 橘省吾, 橘省吾, 荒川政彦, 池田人, 石黒正晃

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2019   2019

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  17. 小惑星探査ミッション「はやぶさ2」のこれまでの成果

    吉川真, 津田雄一, 中澤暁, 照井冬人, 佐伯孝尚, 田中智, 岡田達明, 池田人, 渡邊誠一郎, 杉田精司, 橘省吾, 並木則行, 北里宏平, 荒川政彦

    日本天文学会年会講演予稿集   Vol. 2019   2019

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  18. 多バンド可視観測による小惑星リュウグウとベヌーの比較

    杉田精司, 本田理恵, 諸田智克, 亀田真吾, 巽瑛理, 横田康弘, 横田康弘, 山田学, 松岡萌, 長勇一郎, 神山徹, 鈴木秀彦, 坂谷尚哉, 本田親寿, 吉岡和夫, 早川雅彦, 澤田弘崇, 渡邊誠一郎, 津田雄一

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2019   2019

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  19. はやぶさ2搭載近赤外分光計によって観測された小惑星リュウグウの表面組成

    北里宏平, 岩田隆浩, 安部正真, 大竹真紀子, 松浦周二, 荒井武彦, 仲内悠祐, 中村智樹, 松岡萌, 千秋博紀, 平田成, 廣井孝弘, 渡邊誠一郎

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2019   2019

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  20. 火星衛星探査計画MMXの進展とサイエンス

    倉本圭, 倉本圭, 川勝康弘, 藤本正樹, BIBRING Jean-Pierre, 玄田英典, 平田成, 今村剛, 亀田真吾, LAWRENCE David, 松本晃治, 宮本英昭, 諸田智克, 長岡央, 中川広務, 中村智樹, 小川和律, 大嶽久志, 尾崎正伸, 佐々木晶, 千秋博紀, 橘省吾, 寺田直樹, 臼井寛裕, 和田浩二, 渡邊誠一郎

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2019   2019

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  21. 火星衛星探査計画MMX:目指す科学とその推進

    倉本圭, 倉本圭, 川勝康弘, 藤本正樹, BIBRING Jean Pierre, LAWRENCE David, 玄田英典, 平田成, 今村剛, 亀田真吾, 松本晃治, 宮本英昭, 諸田智克, 長岡央, 中川広務, 中村智樹, 小川和律, 大嶽久志, 尾崎正伸, 佐々木晶, 千秋博紀, 橘省吾, 橘省吾, 寺田直樹, 臼井寛裕, 和田浩二, 渡邊誠一郎

    日本地球惑星科学連合大会予稿集(Web)   Vol. 2019   2019

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  22. 太陽系小天体探査の進展 Invited Reviewed

    渡辺誠一郎

    パリティ   Vol. 2019年 ( 1月号 )   2018.12

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)  

  23. 太陽系ハビタブル惑星の成立を探る火星衛星探査計画 MMX

    倉本 圭, 川勝 康弘, 藤本 正樹, 玄田 英典, 平田 成, 今村 剛, 亀田 真吾, 松本 晃治, 宮本 英昭, 諸田 智克, 長岡 央, 中川 広務, 中村 智樹, 小川 和律, 大嶽 久志, 尾崎 正伸, 佐々木 晶, 千秋 博紀, 橘 省吾, 寺田 直樹, 臼井 寛裕, 和田 浩二, 渡邊 誠一郎, MMX Study Team

    日本惑星科学会誌   Vol. 27 ( 3 ) page: 207 - 215   2018.9

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:The Japanese Society for Planetary Sciences  

    DOI: 10.14909/yuseijin.27.3_207

    CiNii Books

  24. Initial Observation of the asteroid Ryugu by Thermal Infrared Camera (TIR) on board HAYABUSA 2

    田中智, 岡田達明, 福原哲哉, 田口真, 荒井武彦, 千秋博紀, 坂谷尚哉, 嶌生有理, 出村裕英, 小川佳子, 須古健太郎, 関口朋彦, 神山徹, 滝田隼, 松永恒雄, 今村剛, 和田武彦, 長谷川直, HELBERT Jorn, MUELLER T. G., HAGERMANN A., BIELE J., GROTT M., HAMM M., DELBO M., 平田成, 山本幸生, 照井冬人, 佐伯孝尚, 中澤暁, 吉川真, 渡邊誠一郎, 津田雄一

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2018   2018

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  25. はやぶさ2探査機の観測に基づく小惑星リュウグウの形状

    平田成, 平田直之, 田中小百合, 西川直輝, 杉山貴亮, GASKELL R., PALMER E., 野口里奈, 嶌生有理, 杉田精司, 津田雄一, 渡邊誠一郎

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2018   2018

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  26. はやぶさ2/LIDAR測距データを用いた着陸点選定のための探査機軌道改良

    松本晃治, 野田寛大, 石原吉明, 千秋博紀, 竝木則行, 山本圭香, 渡邊誠一郎, 平田成, 平田直之, 山本幸生, 尾川順子, 菊地翔太, 佐伯孝尚, 津田雄一

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2018   2018

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  27. Searching SCI craters: Results of a Hayabusa2 landing site selection dry-run

    SHIMAKI Yuri, WADA Koji, SHIRAI Kei, ARAKAWA Masahiko, KADONO Toshihiko, ISHIBASHI Ko, KIMURA Hiroshi, TAKAGI Yasuhiko, HIRATA Naru, HAYAKAWA Masahiko, MOROTA Tomokatsu, TATSUMI Eri, KANAMARU Masanori, SAKATANI Naoya, KAMEDA Shingo, SUGITA Seiji, MICHIKAMI Tatsuhiro, TANAKA Satoshi, MIURA Akira, YAMAGUCHI Tomohiro, YAMADA Manabu, HONDA Rie, YOKOTA Yasuhiro, NAKAMURA Tomoki, SAWADA Hirotaka, OGAWA Kazunori, SAIKI Takanao, YAMAMOTO Yukio, SENSHU Hiroki, NOGUCHI Takaaki, WATANABE Sei-ichiro

    日本地球惑星科学連合大会予稿集(Web)   Vol. 2018   2018

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  28. 火星衛星探査計画MMXとそのサイエンス2018

    倉本圭, 倉本圭, 川勝康弘, 藤本正樹, 玄田英典, 平田成, 今村剛, 亀田真吾, 松本晃治, 宮本英昭, 諸田智克, 長岡央, 中川広務, 中村智樹, 小川和律, 大嶽久志, 尾崎正伸, 佐々木晶, 千秋博紀, 橘省吾, 寺田直樹, 臼井寛裕, 和田浩二, 渡邊誠一郎

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2018   2018

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  29. An Estimate of rotational prosperities of asteroid Ryugu using simulated image data

    NISHIKAWA Naoki, HIRATA Naoyuki, HIRATA Naru, SAYURI Tanaka, WATANABE Sei-ichiro, ISHIHARA Yoshiaki, TANAKA Satoshi, YAMAGUCHI Tomohiro, MIURA Akira, YAMAMOTO Yukio

    日本地球惑星科学連合大会予稿集(Web)   Vol. 2018   2018

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  30. はやぶさ2によるリュウグウ観測の概観

    渡邊誠一郎, 渡邊誠一郎, 吉川真, 田中智, 杉田精司, 北里宏平, 竝木則行, 岡田達明, 平田成, 平田直之, 山本幸生, 藪田ひかる, 中村智樹, 石原吉明, 佐伯孝尚, 津田雄一

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2018   2018

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  31. NIRS3: The near infrared spectrometer on Hayabusa2 Reviewed

    Iwata, T, K. Kitazato, M. Abe, S. Watanab

    Space Science Review   Vol. 208   page: 317-337   2017.7

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)  

    DOI: 10.1007/s11214-017-0341-0

  32. The camera of the MASCOT asteroid lander on board Hayabusa2 Reviewed

    Jaumann, R, N. Schmitz, A. Koncz, S. Watanab

    Space Science Review   Vol. 208   page: 375-400   2017.7

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)  

    DOI: 10.1007/s11214-016-0263-2

  33. 火星衛星サンプルリターン計画Martian Moons eXploration

    尾崎正伸, 大嶽久志, 川勝康弘, 藤本正樹, 倉本圭, 橘省吾, 寺田直樹, 中村智樹, 和田浩二, 千秋博紀, 宮本英昭, 今村剛, 臼井寛裕, 玄田英典, 亀田真吾, 長岡央, 松本晃治, 諸田智克, 渡邊誠一郎, 佐々木晶, 小川和律

    日本天文学会年会講演予稿集   Vol. 2017   page: 225   2017.2

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    J-GLOBAL

  34. Hayabusa2 landing site selection (LSS) training: Summary report of scientific evaluation

    YABUTA Hikaru, HIRATA Naru, HONDA Rie, ISHIHARA Yoshiaki, KITAZATO Kohei, KOMATSU Mutsumi, MIURA Akira, MATSUMOTO Koji, MOROTA Tomokatsu, NAKAMURA Tomoki, NAKATO Aiko, NOGUCHI Takaaki, OKADA Tatsuaki, SAKATANI Naoya, SUGITA Seiji, TACHIBANA Shogo, TANAKA Satoshi, TATSUMI Eri, WATANABE Sei-ichiro, YAMAGUCHI Tomohiro, YAMAMOTO Yukio

    極域科学シンポジウム(Web)   Vol. 8th   2017

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  35. はやぶさ2着陸点選定訓練:データ解析・検討

    渡邊誠一郎, 渡邊誠一郎, 石原吉明, 田中智, 山口智宏, 三浦昭, 山本幸生, 平田成, 諸田智克, 坂谷尚哉, 北里宏平, 松本晃治, 藪田ひかる

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2017   2017

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  36. 小惑星探査ミッション「はやぶさ2」の現状と今後の運用について

    吉川真, 津田雄一, 佐伯孝尚, 中澤暁, 田中智, 渡邊誠一郎

    日本天文学会年会講演予稿集   Vol. 2017   2017

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  37. 火星衛星探査計画MMXとそのサイエンス2017

    倉本圭, 川勝康弘, 藤本正樹, 玄田英典, 今村剛, 亀田真吾, 松本晃治, 宮本英昭, 諸田智克, 中村智樹, 小川和律, 尾崎正伸, 佐々木晶, 千秋博紀, 橘省吾, 寺田直樹, 臼井寛裕, 和田浩二, 渡邊誠一郎

    日本惑星科学会秋季講演会予稿集(Web)   Vol. 2017   2017

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Presentations 59

  1. はやぶさ2の総括

    渡邊誠一郎

    新学術領域研究「水惑星」全体会議  2022.3.2  新学術領域研究「水惑星学の創成」

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  2. はやぶさ2探査と微惑星形成

    渡邊誠一郎

    日本惑星科学会2021秋季講演会  2021.9.16  日本惑星科学会

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    Event date: 2021.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:名古屋(オンライン)   Country:Japan  

  3. Interdisciplinary Science of Hayabusa2 Mission International conference

    Sei-ichiro Watanabe

    Japan Geoscience Union Meeting 2021  2021.6.6  Japan Geoscience Union

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    Event date: 2021.5 - 2021.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  4. Hayabusa2 at Ryugu Journey to the origin of Earth Invited International conference

    Sei-ichiro Watanabe

    2021.4.14  UCLA

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    Event date: 2021.4

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Online   Country:United States  

  5. はやぶさ2の近傍観測結果

    渡邊誠一郎

    新学術領域研究「水惑星」全体会議  2021.3.9  新学術領域研究「水惑星学の創成」

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    Event date: 2021.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢   Country:Japan  

  6. はやぶさ2の成果から見えてきた太陽系物質輸送 Invited International coauthorship

    渡邊誠一郎

    東北大学惑星圏研究会  2021.2.17  東北大学理学研究科惑星プラズマ・大気研究センター

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    Event date: 2021.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  7. はやぶさ2の近傍探査による科学成果 Invited International coauthorship

    渡邊誠一郎

    宇宙科学シンポジウム  2021.1.7  宇宙航空研究開発機構宇宙科学研究所

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    Event date: 2021.1

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  8. はやぶさ2のリュウグウ近傍探査と科学成果 Invited International coauthorship

    渡邊誠一郎

    日本地球化学会年会2020  2020.11.19  日本化学会

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    Event date: 2020.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  9. はやぶさ2のリュウグウ近傍観測の科学成果 International coauthorship

    渡邊誠一郎

    日本惑星科学会秋季講演会2020  2020.11.13  日本惑星科学会

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    Event date: 2020.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  10. 小惑星リュウグウの科学 Invited International coauthorship

    渡邊誠一郎

    日本天文学会秋季年会  2020.9.10  日本天文学会

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン   Country:Japan  

  11. 小惑星リュウグウのクレーターと周辺ボルダーの関係に着目した表層の層構造の推定 International coauthorship International conference

    渡邊誠一郎

    JpGU-AGU Joint Meeting 2020  2020.7  地球惑星科学連合

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    Event date: 2020.7

    Language:English   Presentation type:Oral presentation (general)  

    Venue:千葉県千葉市(コロナによりオンライン開催)   Country:Japan  

  12. Paucity of boulders in shallow craters on asteroid 162173 Ryugu International conference

    S. Watanabe, H. Akahane, T. Morota, T. Michikami, N. Hirata, N. Hirata, Y. Shimaki, R. Noguchi, R. Honda, S. Kameda, M. Yamada, N. Sakatani, K. Ogawa, E. Tatsumi, T. Kouyama, Y. Yokota, Y. Cho, H. Suzuki, M. Hayakaewa, M. Matsuoka, C. Honda, K. Yoshioka, H. Sawada, S. Sugita, M. Arakawa, Hayabusa2 Science Team

    51th Lunar and Planetary Science Conference 

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    Event date: 2020.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  13. An overview of Hayabusa2 mission and asteroid 162173 Ryugu International conference

    S. Watanabe, M. Hirabayashi, N. Hirata, N. Hirata, M. Yoshikawa, S. Tanaka, S. Sugita, K. Kitazato, T. Okada, N. Namiki, S. Tachibana, M. Arakawa, H. Ikeda, T. Morota, K. Sugiura, H. Kobayashi, T. Saiki, Y. Tsuda, Hayabusa2 Science Team

    Asteroid Science in the Age of Hayabusa20 and OSIRIS-Rex 

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    Event date: 2019.11

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  14. The shape and origin of the rubble-pile asteroid Ryugu Invited International conference

    Sei-ichiro Watanabe, Masatoshi Hirabayashi, Naru Hirata, Naoyuki Hirata, Rina Noguchi, Yuri Shimaki, Hitoshi Ikeda, Eri Tatsumi, Makoto Yoshikawa, Shota Kikuchi, Hikaru Yabuta, Tomoki Nakamura, Shogo Tachibana, Yoshiaki Ishihara, Tomokatsu Morota, Kohei Kitazato, Naoya Sakatani, Koji Matsumoto, Koji Wada, Hiroki Senshu, Chikatoshi Honda, Tatsuhiro Michikami, Hiroshi Takeuchi, Toru Kouyama, Rie Honda, Robert Gaskell, Eric Palmer, Olivier S. Barnouin, Patrick Michel, Paul Abell, Yukio Yamamoto, Satoshi Tanaka , Kei Shirai, Moe Matsuoka, Seiji Sugita, Tatsuaki Okada, Noriyuki Namiki, Masahiko Arakawa, Masateru Ishiguro, Kazunori Ogawa, Fuyuto Terui, Takanao Saiki, Satoru Nakazawa, Yuichi Tsuda, Hayabusa2 Science Team

    Japan Geoscience Union Meeting 2019 

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    Event date: 2019.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Chiba, Japan   Country:Japan  

  15. High Porosity Nature of the Top-Shape C-Type Asteroid 162173 Ryugu as Observed by Hayabusa2 International conference

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    Event date: 2019.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  16. Overview of the proximity operation at asteroid Ryugu by the Hayabusa2 spacecraft Invited International conference

    S. watanabe, M. Yoshikawa, S. tanaka, S. Sugita, K. Kitazato, N. Namiki, K. Okada, S. Tachibana, R. Jaumann, J.-P. Bibring, N. Hirata, N. Hirata, H. Ikeda, Y. Yamamoto, F. Terui, T. Saiki, A. nakazawa, Y. tsuda

    American Geophysical Union 2018 Fall Meeting 

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    Event date: 2018.12

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Washington, United States of America   Country:United States  

  17. Scientific goal and objectives of the Hayabusa-2 mission International conference

    Hayabusa2 Joint Science Team Meeting 

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    Event date: 2012.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  18. The chronology of the Solar System based on lunar and planetary exploration International conference

    Sei-ichiro Watanabe

    Formation of Stars & Planets 2011 

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    Event date: 2011.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  19. Theories and problems of terrestrial planet formation

    Extrasolar Terrestrial Planets and Their Formation 

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    Event date: 2009.9

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  20. Thermally induced waves in protoplanetary disks and its implication for planetary formation International conference

    Exoplanets and Disks: Their Formation and Diversity, the 2nd Subaru International Conference 

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    Event date: 2009.3

    Language:English  

  21. Size distribution of dust grains in vortices in the protoplanetary disks International conference

    Exoplanets and Disks: Their Formation and Diversity, The 2nd Subaru International Conference 

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    Event date: 2009.3

    Language:English   Presentation type:Poster presentation  

  22. Numerical Simulation of Dust Circulation in Protoplanetary Disks International conference

    Exoplanets and Disks: Their Formation and Diversity 

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    Event date: 2009.3

    Language:English   Presentation type:Poster presentation  

  23. Dust ring formation due to ice sublimation in debris disks. International conference

    Asia Oceania Geosciences Society 5th Annual Meeting 

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    Event date: 2008.6

    Language:English   Presentation type:Oral presentation (general)  

  24. Thermally induced waves in irradiated protoplanetary disks International conference

    39th Lunar and Planetary Science Conference 

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    Event date: 2008.3

    Language:English   Presentation type:Poster presentation  

  25. Formulation of planetary migration in planetesimal disk International conference

    39th Lunar and Planetary Science Conference 

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    Event date: 2008.3

    Language:English   Presentation type:Poster presentation  

  26. The role of interactions between the thermohaline circulation and oceanic carbon cycle- A case study of Nagoya simple climate model -. International conference

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    Event date: 2006.12

    Language:English   Presentation type:Poster presentation  

  27. The Analysis of the Glacial Cycles: Approch for the Simplified Climate-Ice Sheet Model International conference

    American Geophysical Union, San Francisco, USA 

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    Event date: 2006.12

    Language:English   Presentation type:Poster presentation  

  28. The role of interactions between the thermohaline circulation and oceanic carbon cycle - A case study of Nagoya simple climate model -.

    International Symposium on Dynamics of the Ice Age Climate, NagoyaUniversity, Nagoya 

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    Event date: 2006.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  29. Formulations of Planetary Migration in a Planetesimal Disk International conference

    38th DPS Meetings, Pasadena, USA 

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    Event date: 2006.10

    Language:English   Presentation type:Poster presentation  

  30. Numerical Simulations of Dust Circulation in Protoplanetary Disks International conference

    38th Annual DPS Meeting 

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    Event date: 2006.10

    Language:English   Presentation type:Poster presentation  

  31. Simulations of dust circulation in protoplanetary disks International conference

    Protostars and Planets V Conference, Hawaii, USA 

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    Event date: 2005.10

    Language:English   Presentation type:Poster presentation  

  32. Migration mechanism of Neptune International conference

    Protostars and Planets V Conference, Hawaii, USA 

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    Event date: 2005.10

    Language:English   Presentation type:Poster presentation  

  33. Dust circulation in the protoplanetary disks and formation of Planetesimals International conference

    Protostars and Planets V Conference, Hawaii, USA 

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    Event date: 2005.10

    Language:English   Presentation type:Poster presentation  

  34. Numerical Simulations of Dust-Gas 2-phase Flows in the Solar Nebula International conference

    Western Pacific Geophysics Meeting 2000, Tokyo 

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    Event date: 2000

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  35. The Numerical Simulations of Gas Accretion around Protoplanets.1998. International conference

    Protostars and Planets IV, Santa Barbara, California, USA 

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    Event date: 1998

    Language:English   Presentation type:Poster presentation  

  36. 原始惑星系円盤の渦におけるダストのサイズ分布

    河村恵里,渡邊誠一郎

    地球惑星科学連合大会2009 

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    Event date: 2009.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  37. 輻射圧による円盤内縁からのダスト動径方向輸送:乱流拡散の影響

    藤原大輔,渡邊誠一郎

    地球惑星科学連合大会2009 

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    Event date: 2009.5

    Language:Japanese   Presentation type:Poster presentation  

    Country:Japan  

  38. 微惑星との相互作用による惑星移動の素過程

    高橋啓介,渡邊誠一郎

    日本惑星科学会秋季講演会2008年 

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    Event date: 2008.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  39. デブリ円盤における衝突の効果

    小林浩,田中秀和,山本哲生

    日本惑星科学会秋季講演会2008年 

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    Event date: 2008.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  40. 原始惑星系円盤内の渦におけるダストのサイズ分布

    河村恵里,渡邊誠一郎

    日本惑星科学会秋季講演会2008年 

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    Event date: 2008.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  41. ダスト循環モデルによる原始惑星系円盤内縁領域でのダストの動径方向移動

    藤原大輔,渡邊誠一郎

    日本惑星科学会秋季講演会2008年 

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    Event date: 2008.11

    Language:Japanese   Presentation type:Poster presentation  

  42. 惑星の形成と地球の初期進化

    渡邊誠一郎

    公開セミナー天文学の最前線~元素から生命へ~ 

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    Event date: 2008.8

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  43. デブリ円盤でのダスト力学

    小林浩,木村宏,渡邊誠一郎,山本哲生

    地球惑星科学連合大会2008 

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    Event date: 2008.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  44. 原始惑星系円盤:理論

    渡邊誠一郎

    京都太陽系研究会 

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    Event date: 2008.4

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  45. デブリ円盤における氷ダスト昇華

    小林浩,木村宏,渡邊誠一郎,山本哲生

    日本惑星科学会秋季講演会2007年 

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    Event date: 2007.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  46. 原始惑星系円盤における熱的波動の伝搬とSEDの変化

    渡邊誠一郎,D.N.C. Lin

    日本惑星科学会秋季講演会2007年 

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    Event date: 2007.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  47. 膨らんだ内縁をもつ原始惑星系円盤での中心星輻射圧によるダスト循環のシミュレーション

    藤原大輔,渡邊誠一郎

    日本惑星科学会秋季講演会2007年 

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    Event date: 2007.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  48. 微惑星との相互作用による惑星移動の定式化

    高橋啓介,小林浩,渡邊誠一郎

    日本惑星科学会秋季講演会2007年 

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    Event date: 2007.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  49. 惑星形成論の現状とこれから

    渡邊誠一郎

    地球惑星科学関連学会2004年合同大会 

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    Event date: 2004.5

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  50. 火星と地球どこが違う?

    渡邊誠一郎

    名古屋市科学館「プラネタリウム」 

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    Event date: 2003

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  51. 命の宿る星を求めて-比較惑星系形成論-

    渡邊誠一郎

    電力館「科学ゼミナール」,東京 

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    Event date: 2003

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  52. 地球の進化

    渡邊誠一郎

    NHK名古屋文化センター「宇宙と地球の進化」,名古屋 

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    Event date: 2003

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  53. 原始惑星系円盤における惑星形成領域への質量輸送

    渡邊誠一郎

    日本惑星科学会2002年秋季講演会,水沢 

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    Event date: 2002.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  54. Overview of the proximity operation at asteroid Ryugu by the Hayabusa2 spacecraft Invited

    S. watanabe, M. Yoshikawa, S. tanaka, S. Sugita, K. Kitazato, N. Namiki, K. Okada, S. Tachibana, R. Jaumann, J.-P. Bibring, N. Hirata, N. Hirata, H. Ikeda, Y. Yamamoto, F. Terui, T. Saiki, A. nakazawa, Y. tsuda

    American Geophysical Union 2018 Fall Meeting  2018.12.11  American Geophysical Union

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Washington, United States of America  

  55. Overview of the proximity operation at asteroid Ryugu by the Hayabusa2 spacecraft Invited

    S. watanabe, M. Yoshikawa, S. tanaka, S. Sugita, K. Kitazato, N. Namiki, K. Okada, S. Tachibana, R. Jaumann, J.-P. Bibring, N. Hirata, N. Hirata, H. Ikeda, Y. Yamamoto, F. Terui, T. Saiki, A. nakazawa, Y. tsuda

    American Geophysical Union 2019 Fall Meeting  2019.12.11  American Geophysical Union

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Washington, United States of America  

  56. High Porosity Nature of the Top-Shape C-Type Asteroid 162173 Ryugu as Observed by Hayabusa2

    S. Watanabe, M. Hirabayashi, N. Hirata, N. Hirata, R. Noguchi, Y. Shimaki, H. Ikeda, E. Tatsumi, M. Yoshikawa, S. Kikuchi, H. Yabuta, T. Nakamura, S. Tachibana, Y. Ishihara, T. Morota, K. Kitazato, N. Sakatani, K. Matsumoto, K. Wada, H. Senshu, C. Honda, T. Michikami, H. Takeuchi, T. Kouyama, R. Honda, S. Kameda, T. Fuse, H. Miyamoto, G. Komatsu, S. Sugita, T. Okada, N. Namiki, M. Arakawa, M. Ishiguro, M. Abe, R. Gaskell, E. Palmer, O. S. Barnouin, P. Michel, A. S. French, J. W. McMahon, D. J. S

    50th Lunar and Planetary Science COnference  2019.3 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:The Woodsland, TX, USA  

  57. An overview of Hayabusa2 mission and asteroid 162173 Ryugu

    S. Watanabe, M. Hirabayashi, N. Hirata, N. Hirata, M. Yoshikawa, S. Tanaka, S. Sugita, K. Kitazato, T. Okada, N. Namiki, S. Tachibana, M. Arakawa, H. Ikeda, T. Morota, K. Sugiura, H. Kobayashi, T. Saiki, Y. Tsuda, Hayabusa, Science Team

    Asteroid Science in the Age of Hayabusa20 and OSIRIS-Rex  2019.11 

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    Language:English   Presentation type:Poster presentation  

  58. Paucity of boulders in shallow craters on asteroid 162173 Ryugu

    S. Watanabe, H. Akahane, T. Morota, T. Michikami, N. Hirata, N. Hirata, Y. Shimaki, R. Noguchi, R. Honda, S. Kameda, M. Yamada, N. Sakatani, K. Ogawa, E. Tatsumi, T. Kouyama, Y. Yokota, Y. Cho, H. Suzuki, M. Hayakaewa, M. Matsuoka, C. Honda, K. Yoshioka, H. Sawada, S. Sugita, M. Arakawa, Hayabusa, Science Team

    51th Lunar and Planetary Science Conference  2020.3.16 

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    Language:English   Presentation type:Oral presentation (general)  

  59. The shape and origin of the rubble-pile asteroid Ryugu Invited

    Sei-ichiro Watanabe, Masatoshi Hirabayashi, Naru Hirata, Naoyuki Hirata, Rina Noguchi, Yuri Shimaki, Hitoshi Ikeda, Eri Tatsumi, Makoto Yoshikawa, Shota Kikuchi, Hikaru Yabuta, Tomoki Nakamura, Shogo Tachibana, Yoshiaki Ishihara, Tomokatsu Morota, Kohei Kitazato, Naoya Sakatani, Koji Matsumoto, Koji Wada, Hiroki Senshu, Chikatoshi Honda, Tatsuhiro Michikami, Hiroshi Takeuchi, Toru Kouyama, Rie Honda, Robert Gaskell, Eric Palmer, Olivier S. Barnouin, Patrick Michel, Paul Abell, Yukio Yamamoto, Sa

    Japan Geoscience Union Meeting 2019  2019.5.26 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:Chiba, Japan  

▼display all

Research Project for Joint Research, Competitive Funding, etc. 1

  1. Origin and Evolution of Irregular Satellites

    2003 - 2006

    International Cooperative Research 

KAKENHI (Grants-in-Aid for Scientific Research) 5

  1. Formation and topographic relaxation of spinning top-shaped asteroids

    Grant number:19H01951  2019.4 - 2022.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship:Principal investigator 

    Grant amount:\10790000 ( Direct Cost: \8300000 、 Indirect Cost:\2490000 )

  2. Solar System Exploration for Aqua-planetology

    Grant number:17H06459  2017.6 - 2022.3

    Grant-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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    Authorship:Coinvestigator(s) 

    Grant amount:\6240000 ( Direct Cost: \4800000 、 Indirect Cost:\1440000 )

  3. ダストダイナミクスが決める惑星形成の初期条件

    2007.4 - 2009.3

    科学研究費補助金  基盤研究(C)(一般),課題番号:19540239

    渡邊 誠一郎

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    Authorship:Principal investigator 

  4. ダストから太陽系外惑星に至る物質進化の実験および理論的研究

    2004 - 2009.3

    科学研究費補助金  重点領域研究

    山本哲生

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    Authorship:Coinvestigator(s) 

    室内実験と理論的研究の密接な連携により、原始惑星系円盤におけるダストから惑星への成長過程の解明や系外惑星の発見につながる、さまなまな観測情報を読み解く物質化学的ツールを開発することで、惑星系形成論を普遍化することを目的としている。

  5. 惑星原物質と星間ダストとのリンクの解明

    2001.4 - 2004.3

    科学研究費補助金  基盤研究(B)(2)

    山本哲生

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    Authorship:Coinvestigator(s) 

 

Teaching Experience (On-campus) 86

  1. Fundamentals of Earth Science I

    2021

  2. Geophysics

    2021

  3. Dynamics of the Sun-Earth-Life Interactive System 1

    2021

  4. Lecture on Planetary-System Formation

    2021

  5. Fundamentals of Thermodynamics

    2021

  6. Solar System physics

    2021

  7. 地球惑星科学の最前線

    2021

  8. 地球学1

    2020

  9. 地球惑星科学の最前線

    2020

  10. 地球物理学

    2020

  11. 地球科学入門

    2020

  12. 地球科学基礎I

    2019

  13. 地球科学基礎I

    2018

  14. 地球科学基礎I

    2017

  15. 地球科学基礎I

    2016

  16. 地球科学基礎I

    2015

  17. 惑星系形成論

    2015

  18. 太陽系物理学

    2015

  19. 地球科学基礎I

    2014

  20. 惑星系形成論

    2014

  21. 太陽系物理学

    2014

  22. 地球科学基礎I

    2013

  23. 太陽系物理学

    2013

  24. 惑星系形成論

    2013

  25. 地球科学基礎I

    2012

  26. 太陽系物理学

    2012

  27. 惑星系形成論

    2012

  28. Fundamentals of Earth Science I

    2011

  29. 地球科学基礎I

    2011

  30. 太陽系物理学

    2011

  31. 惑星系形成論

    2011

  32. 地球惑星物理学特論Ⅲ

    2010

  33. 地球惑星数学及び演習

    2010

  34. 地球惑星科学特別研究

    2010

  35. 地球科学基礎Ⅰ

    2010

  36. 太陽系物理学

    2010

  37. 数値解析法Ⅰ及び演習

    2010

  38. 地球科学基礎I

    2010

  39. 地球惑星数学及び演習

    2010

  40. 惑星系形成論

    2010

  41. 太陽系物理学

    2010

  42. 地球科学基礎Ⅰ

    2009

  43. 地球学2

    2009

  44. 惑星系形成論

    2009

  45. 太陽系物理学

    2009

  46. 地球惑星数学及び演習

    2009

  47. 地球科学基礎I

    2009

  48. 地球惑星数学及び演習

    2009

  49. 惑星系形成論

    2009

  50. 太陽系物理学

    2009

  51. 地球惑星物理学特論Ⅲ

    2008

  52. 数値解析法Ⅰ及び演習

    2008

  53. 惑星系形成論

    2008

  54. 太陽系物理学

    2008

  55. 地球惑星数学及び演習

    2008

  56. 地球科学基礎I

    2008

  57. 惑星系形成論

    2008

  58. 地球科学基礎I

    2007

  59. 惑星系形成論

    2007

  60. 太陽系物理学

    2007

  61. 地球惑星数学及び演習

    2007

  62. 地球科学基礎I

    2006

  63. 太陽系物理学

    2006

  64. 地球惑星数学及び演習

    2006

  65. 惑星系形成論

    2006

  66. 固体地球惑星物理学

    2005

  67. 太陽系物理学

    2005

  68. 惑星系形成論

    2005

  69. 地球惑星物理学特論Ⅲ

    2005

  70. 地球惑星物理学演習Ⅰ

    2005

  71. 地球惑星物理学Ⅰ演習

    2005

  72. 地球惑星数学及び演習

    2005

  73. 地球惑星科学特別研究

    2005

  74. 地球惑星科学セミナーⅠ

    2005

  75. 地球科学基礎Ⅰ

    2005

  76. 太陽系物理学

    2005

  77. 数値解析法及び演習

    2005

  78. 数値解析法Ⅱ及び演習

    2005

  79. 数値解析法Ⅰ及び演習

    2005

  80. 数値解析法Ⅰ及び演習

    2004

  81. 地球惑星物理学演習Ⅰ

    2004

  82. 地球惑星物理学Ⅰ演習

    2004

  83. 地球惑星数学及び演習

    2004

  84. 太陽系物理学

    2004

  85. 数値解析法及び演習

    2004

  86. 数値解析法Ⅱ及び演習

    2004

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Teaching Experience (Off-campus) 4

  1. 2013.4 - 2014.3 The University of Tokyo)

  2. 地球内部研究センター客員部門助教授(太陽系初期惑星形成論)

    2000.4 - 2001.3 Okayama University)

  3. 大気海洋学特論

    2008.4 - 2009.3 Kobe University)

  4. 太陽系形成論

    1998.4 - 1999.3 The University of Tokyo)

 

Social Contribution 14

  1. 中日新聞・東京新聞「紙つぶて」連載

    Role(s):Contribution

    中日新聞,東京新聞  紙つぶて(夕刊1面コラム,毎週水曜日)  2020.1 - 2020.6

  2. 講演「はやぶさ2のリュウグウ探査とその成果」

    Role(s):Lecturer

    日本物理学会大阪支部  2021年度公開シンポジウム  2021.12

  3. 講演「小惑星リュウグウは何を語る? 」

    Role(s):Lecturer

    小松市ひとものづくり科学館・金沢大学  宇宙航空人材育成プログラム  2021.12

  4. 講演「小惑星探査機はやぶさ2の科学成果」

    Role(s):Lecturer

    名古屋大学ノーベル賞展示室  2021.10

  5. 一般普及講演「はやぶさ2の見た竜宮城」

    Role(s):Lecturer

    日本惑星科学会,日本鉱物学会  一般普及講演会「はやぶさ2:小惑星リュウグウ探査6年間の旅, そして地上サンプル分析と新たな旅へ」  2021.9

  6. 講座「はやぶさ2によるリュウグウ試料採取」

    Role(s):Lecturer

    NHK文化センター  宇宙講座2021  2021.9

  7. 講演「はやぶさ2によるリュウグウ試料採取」

    Role(s):Lecturer

    あいちシンクロトロン光センター  あいちシンクロトロン光センターセミナー  2021.8

  8. 講演会「はやぶさ2が見た小惑星リュウグウ」

    Role(s):Lecturer

    名古屋大学協力会  名古屋大学協力会講演会  2021.7

  9. はやぶさ2による小惑星リュウグウ探訪記

    Role(s):Lecturer

    名古屋大学  NExT Program  2021.7

  10. 天文講座「はやぶさ2が見た竜宮城小惑星リュウグウの実像」

    Role(s):Lecturer

    小牧市  小牧中部公民館プラネタリウム令和3年度天文講座  2021.7

  11. 講演「はやぶさ2の科学成果」

    Role(s):Lecturer

    中日文化センター  中日文化センター講座  2021.5

  12. トークセッション「小惑星の“かけら”が届けるメッセージ~はやぶさ2から太陽系誕生の謎に挑む」

    Role(s):Appearance, Panelist, Lecturer, Informant

    日本科学未来館  小惑星探査機はやぶさ2カプセル帰還イベント in Miraikan  オンライン  2020.12

  13. はやぶさ2のリュウグウ滞在記

    Role(s):Lecturer

    NHK文化センター名古屋教室  宇宙講座  2020.9

  14. 探査機「はやぶさ2」による小惑星探訪

    Role(s):Lecturer

    半田高校  SSHサイエンスコミュニケーション  2020.8

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Media Coverage 8

  1. はやぶさ2カプセル帰還:はやぶさ2「1000点」ミッション Newspaper, magazine

    中日新聞  中日新聞  朝刊23面「囲み記事」  2020.12

  2. はやぶさ2 近づく旅路の節目:試料カプセル6日に地球へ Newspaper, magazine

    中日新聞  中日新聞  朝刊25面  2020.12

  3. はやぶさ2生命の起源探る Newspaper, magazine

    日本経済新聞社  日本経済新聞  朝刊35面,ニュースな科学  2020.11

     More details

    Author:Other 

  4. 目耳録「完璧な成功」 Newspaper, magazine

    中日新聞社  中日新聞  夕刊7面  2020.12

  5. はやぶさ2 新目的地 Newspaper, magazine

    朝日新聞  朝日新聞  朝刊27面  2020.9

  6. はやぶさ2 小惑星の砂から何がわかる? Newspaper, magazine

    公明党機関誌委員会  公明新聞  4面,土曜特集  2021.1

  7. はやぶさ2サンプルに関する記者説明会 TV or radio program

    各社  2020.12

  8. 小惑星「りゅうぐう」に亡き研究者の名 Newspaper, magazine

    中日新聞社  中日新聞  朝刊27面  2020.12

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