Faculty Profiles - WATANABE, Sei-ichiro

Papers - WATANABE, Sei-ichiro

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Preliminary design of the Hayabusa2 extended mission to the fast-rotating Asteroid 1998 KY26 Reviewed International coauthorship International journal

Shota Kikuchi, Yuya Mimasu, Yuto Takei, Takanao Saiki, Daniel J. Scheeres, Masatoshi Hirabayashi, Koji Wada, Makoto Yoshikawa, Sei-ichiro Watanabe, Satoshi Tanaka, Yuichi Tsuda

Acta Astronautica 2023.6

Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu Reviewed International coauthorship International journal

Laurette Piani, Kazuhide Nagashima, Noriyuki Kawasaki, Naoya Sakamoto, Ken-ichi Bajo, Yoshinari Abe, Jérôme Aléon, Conel M. O’D. Alexander, Sachiko Amari, Yuri Amelin, 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, Shoichi Itoh, 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, Izumi Nakai, Ann Nguyen, Larry Nittler, Morihiko Onose, Andreas Pack, Changkun Park, Liping Qin, Sara S. Russell, Maria Schönbächler, Lauren Tafla, Haolan Tang, Kentaro Terada, Yasuko Terada, Tomohiro Usui, Sohei Wada, Meenakshi Wadhwa, Richard J. Walker, Katsuyuki Yamashita, Qing-Zhu Yin, Tetsuya Yokoyama, Shigekazu Yoneda, Edward D. Young, Hiroharu Yui, Ai-Cheng Zhang, Tomoki Nakamura, Hiroshi Naraoka, Ryuji Okazaki, Kanako Sakamoto, Hikaru Yabuta, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Tatsuaki Okada, Toru Yada, Kasumi Yogata, Satoru Nakazawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Sei-ichiro Watanabe, Makoto Yoshikawa, Shogo Tachibana, Hisayoshi Yurimoto

The Astrophysical Journal Letters Vol. 946 ( 2 ) page： L43 - L43 2023.4

Language：English Publishing type：Research paper (scientific journal) Publisher：American Astronomical Society

Abstract

Rock fragments of the Cb-type asteroid Ryugu returned to Earth by the JAXA Hayabusa2 mission share mineralogical, chemical, and isotopic properties with the Ivuna-type (CI) carbonaceous chondrites. Similar to CI chondrites, these fragments underwent extensive aqueous alteration and consist predominantly of hydrous minerals likely formed in the presence of liquid water on the Ryugu parent asteroid. Here we present an in situ analytical survey performed by secondary ion mass spectrometry from which we have estimated the D/H ratio of Ryugu’s hydrous minerals, D/HRyugu, to be [165 ± 19] × 10−6, which corresponds to δDRyugu = +59 ± 121‰ (2σ). The hydrous mineral D/HRyugu’s values for the two sampling sites on Ryugu are similar; they are also similar to the estimated D/H ratio of hydrous minerals in the CI chondrites Orgueil and Alais. This result reinforces a link between Ryugu and CI chondrites and an inference that Ryugu’s samples, which avoided terrestrial contamination, are our best proxy to estimate the composition of water at the origin of hydrous minerals in CI-like material. Based on this data and recent literature studies, the contribution of CI chondrites to the hydrogen of Earth’s surficial reservoirs is evaluated to be ∼3%. We conclude that the water responsible for the alteration of Ryugu’s rocks was derived from water ice precursors inherited from the interstellar medium; the ice partially re-equilibrated its hydrogen with the nebular H2 before being accreted on the Ryugu’s parent asteroid.

DOI： 10.3847/2041-8213/acc393

Other Link： https://iopscience.iop.org/article/10.3847/2041-8213/acc393/pdf

Extraterrestrial amino acids and amines identified in asteroid Ryugu samples returned by the Hayabusa2 mission Reviewed International coauthorship

Eric T. Parker, Hannah L. McLain, Daniel P. Glavin, Jason P. Dworkin, Jamie E. Elsila, José C. Aponte, Hiroshi Naraoka, Yoshinori Takano, Shogo Tachibana, Hikaru Yabuta, Hisayoshi Yurimoto, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Satoru Nakazawa, Yuichi Tsuda, Fuyuto Terui, Takaaki Noguchi, Ryuji Okazaki, Sei-ichiro Watanabe, Tomoki Nakamura

Geochimica et Cosmochimica Acta Vol. 347 page： 42 - 57 2023.4

Measurement of Microscopic Thermal Diffusivity Distribution for Ryugu Sample by Infrared Lock-in Periodic Heating Method Reviewed International coauthorship International journal

Takuya Ishizaki, Hosei Nagano, Satoshi Tanaka, Naoya Sakatani, Tomoki Nakamura, Tatsuaki Okada, Ryohei Fujita, Abdulkareem Alasli, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda

International Journal of Thermophysics Vol. 44 ( 4 ) 2023.4

Insights into the formation and evolution of extraterrestrial amino acids from the asteroid Ryugu Reviewed

Christian Potiszil, Tsutomu Ota, Masahiro Yamanaka, Chie Sakaguchi, Katsura Kobayashi, Ryoji Tanaka, Tak Kunihiro, Hiroshi Kitagawa, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa, Eizo Nakamura

Nature Communications Vol. 14 ( 1 ) page： 1482 2023.3

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

Abstract

All life on Earth contains amino acids and carbonaceous chondrite meteorites have been suggested as their source at the origin of life on Earth. While many meteoritic amino acids are considered indigenous, deciphering the extent of terrestrial contamination remains an issue. The Ryugu asteroid fragments (JAXA Hayabusa2 mission), represent the most uncontaminated primitive extraterrestrial material available. Here, the concentrations of amino acids from two particles from different touchdown sites (TD1 and TD2) are reported. The concentrations show that N,N-dimethylglycine (DMG) is the most abundant amino acid in the TD1 particle, but below detection limit in the other. The TD1 particle mineral components indicate it experienced more aqueous alteration. Furthermore, the relationships between the amino acids and the geochemistry suggest that DMG formed on the Ryugu progenitor body during aqueous alteration. The findings highlight the importance of aqueous chemistry for defining the ultimate concentrations of amino acids in primitive extraterrestrial samples.

DOI： 10.1038/s41467-023-37107-6

Other Link： https://www.nature.com/articles/s41467-023-37107-6

The noble gas and nitrogen relationship between Ryugu and carbonaceous chondrites Reviewed International coauthorship

Broadley M. W., Byrne D. J., Furi E., Zimmermann L., Marty B., Okazaki R., Yada T., Kitajima F., Tachibana S., Yogata K., Sakamoto K., Yurimoto H., Nakamura T., Noguchi T., Naraoka H., Yabuta H., Watanabe S., Tsuda Y., Nishimura M., Nakato A., Miyazaki A., Abe M., Okada T., Usui T., Yoshikawa M., Saiki T., Tanaka S., Terui F., Nakazawa S., Busemann H., Hashizume K., Gilmour J. D., Meshik A., Riebe M. E. I., Krietsch D., Maden C., Ishida A., Clay P., Crowther S. A., Fawcett L., Lawton T., Pravdivtseva O., Miura Y. N., Park J., Bajo K., Takano Y., Yamada K., Kawagucci S., Matsui Y., Yamamoto M., Righter K., Sakai S., Iwata N., Shirai N., Sekimoto S., Inagaki M., Ebihara M., Yokochi R., Nishiizumi K., Nagao K., Lee J. I, Kano A., Caffee M. W., Uemura R.

GEOCHIMICA ET COSMOCHIMICA ACTA Vol. 345 page： 62 - 74 2023.3

Interaction between clay minerals and organics in asteroid Ryugu Reviewed International coauthorship

J.-C. Viennet, M. Roskosz, T. Nakamura, P. Beck, B. Baptiste, B. Lavina, E.E. Alp, M.Y. Hu, J. Zhao, M. Gounelle, R. Brunetto, H. Yurimoto, T. Noguchi, R. Okazaki, H. Yabuta, H. Naraoka, K. Sakamoto, S. Tachibana, T. Yada, M. Nishimura, A. Nakato, A. Miyazaki, K. Yogata, M. Abe, T. Okada, T. Usui, M. Yoshikawa, T. Saiki, S. Tanaka, F. Terui, S. Nakazawa, S. Watanabe, Y. Tsuda

Geochemical Perspectives Letters Vol. 25 page： 8 - 12 2023.3

Chemical composition of carbonaceous asteroid Ryugu from synchrotron spectroscopy in the mid- to far-infrared of Hayabusa2-returned samples Reviewed International coauthorship

Emmanuel Dartois, Yoko Kebukawa, Hikaru Yabuta, Jérémie Mathurin, Cécile Engrand, Jean Duprat, Laure Bejach, Alexandre Dazzi, Ariane Deniset-Besseau, Lydie Bonal, Eric Quirico, Christophe Sandt, Ferenc Borondics, Jens Barosch, George D. Cody, Brad T. De Gregorio, Minako Hashiguchi, David A. L. Kilcoyne, Mutsumi Komatsu, Zita Martins, Megumi Matsumoto, Gilles Montagnac, Smail Mostefaoui, Larry R. Nittler, Takuji Ohigashi, Taiga Okumura, Laurent Remusat, Scott Sandford, Miho Shigenaka, Rhonda Stroud, Hiroki Suga, Yoshio Takahashi, Yasuo Takeichi, Yusuke Tamenori, Maximilien Verdier-Paoletti, Shohei Yamashita, Tomoki Nakamura, Tomoyo Morita, Mizuha Kikuiri, Kana Amano, Eiichi Kagawa, Takaaki Noguchi, Hiroshi Naraoka, Ryuji Okazaki, Kanako Sakamoto, Hisayoshi Yurimoto, Masanao Abe, Kanami Kamide, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Shogo Tachibana, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa

Astronomy & Astrophysics Vol. 671 page： A2 - A2 2023.2

Language：English Publishing type：Research paper (scientific journal) Publisher：EDP Sciences

Context. The current period is conducive to exploring our Solar System's origins with recent and future space sample return missions, which provide invaluable information from known Solar System asteroids and comets The Hayabusa2 mission of the Japan Aerospace Exploration Agency (JAXA) recently brought back samples from the surface of the Ryugu carbonaceous asteroid.

Aims. We aim to identify the different forms of chemical composition of organic matter and minerals that constitute these Solar System primitive objects, to shed light on the Solar System's origins.

Methods. In this work, we recorded infrared (IR) hyper-spectral maps of whole-rock Ryugu asteroid samples at the highest achievable spatial resolution with a synchrotron in the mid-IR (MIR). Additional global far-IR (FIR) spectra of each sample were also acquired.

Results. The hyper-spectral maps reveal the variability of the functional groups at small scales and the intimate association of phyl-losilicates with the aliphatic components of the organic matter present in Ryugu. The relative proportion of column densities of the identified IR functional groups (aliphatics, hydroxyl + interlayer and/or physisorbed water, carbonyl, carbonates, and silicates) giving access to the composition of the Ryugu samples is estimated from these IR hyper-spectral maps. Phyllosilicate spectra reveal the presence of mixtures of serpentine and saponite. We do not detect anhydrous silicates in the samples analysed, at the scales probed. The carbonates are dominated by dolomite. Aliphatics organics are distributed over the whole samples at the micron scale probed with the synchrotron, and intimately mixed with the phyllosilicates. The aromatic C=C contribution could not be safely deconvolved from OH in most spectra, due to the ubiquitous presence of hydrated minerals. The peak intensity ratios of the organics methylene to methyl (CH2/CH3) of the Ryugu samples vary between about 1.5 and 2.5, and are compared to the ratios in chondrites from types 1 to 3. Overall, the mineralogical and organic characteristics of the Ryugu samples show similarities with those of CI chondrites, although with a noticeably higher CH2/CH3 in Ryugu than generally measured in C1 chondrites collected on Earth, and possibly a higher carbonate content.

DOI： 10.1051/0004-6361/202244702

Web of Science

Small grains from Ryugu: handling and analysis pipeline for infrared synchrotron microspectroscopy Reviewed International coauthorship

Stefano Rubino, Zélia Dionnet, Alice Aléon-Toppani, Rosario Brunetto, Tomoki Nakamura, Donia Baklouti, Zahia Djouadi, Cateline Lantz, Obadias Mivumbi, Ferenc Borondics, Stephane Lefrançois, Christophe Sandt, Francesco Capitani, Eva Héripré, David Troadec, Megumi Matsumoto, Kana Amano, Tomoyo Morita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Seiichiro Watanabe, Yuichi Tsuda

Earth, Planets and Space Vol. 75 ( 1 ) 2023.1

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

Abstract

Sample-return missions allow the study of materials collected directly from celestial bodies, unbiased by atmospheric entry effects and/or terrestrial alteration and contamination phenomena, using state-of-the-art techniques which are available only in a laboratory environment—but only if the collected material stays pristine. The scarcity of outer-space unaltered material recovered until now makes this material extremely precious for the potential scientific insight it can bring. To maximize the scientific output of current and future sample-return missions, the scientific community needs to plan for ways of storing, handling, and measuring this precious material while preserving their pristine state for as long as the ‘invasiveness’ of measurements allows. In July 2021, as part of the Hayabusa2 (JAXA) “Stone” preliminary examination team, we received several microscopic particles from the asteroid Ryugu, with the goal of performing IR hyper-spectral imaging and IR micro-tomography studies. Here, we describe the sample transfer, handling methods and analytical pipeline we implemented to study this very precious material while minimizing and surveilling their alteration history on Earth.

Graphical Abstract

DOI： 10.1186/s40623-022-01762-8

Web of Science

Other Link： https://link.springer.com/article/10.1186/s40623-022-01762-8/fulltext.html

Trace-element analysis of mineral grains in Ryugu rock fragment sections by synchrotron-based confocal X-ray fluorescence Reviewed International coauthorship International journal

Benjamin Bazi, Pieter Tack, Miles Lindner, Bart Vekemans, Ella De Pauw, Beverley Tkalcec, Frank E. Brenker, Jan Garrevoet, Gerald Falkenberg, Hikaru Yabuta, Hisayoshi Yurimoto, Tomoki Nakamura, Kana Amano, Megumi Matsumoto, Yuri Fujioka, Yuma Enokido, Daisuke Nakashima, Masayuki Uesugi, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda, Laszlo Vincze

Earth, Planets and Space Vol. 74 ( 1 ) 2022.11

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

Abstract

A fundamental parameter-based quantification scheme for confocal XRF was applied to sub-micron synchrotron radiation X-ray fluorescence (SR-XRF) data obtained at the beamline P06 of the Deutsches Elektronen-Synchrotron (DESY, Hamburg, Germany) from two sections C0033-01 and C0033-04 that were wet cut from rock fragment C0033 collected from Cb-type asteroid (162173) Ryugu by JAXA’s Hayabusa2 mission. Trace-element quantifications show that C0033 bulk matrix is CI-like, whereas individual mineral grains (i.e., magnetite, pyrrhotite, dolomite, apatite and breunnerite) show, depending on the respective phase, minor to strong deviations. The non-destructive nature of SR-XRF coupled with a new PyMca (a Python toolkit for XRF data analysis)-based quantification approach, performed in parallel with the synchrotron experiments, proves to be an attractive tool for the initial analysis of samples from return missions, such as Hayabusa2 and OSIRIS-REx, the latter returning material from a B-type asteroid (101955) Bennu in 2023.

Graphical Abstract

DOI： 10.1186/s40623-022-01726-y

Web of Science

Other Link： https://link.springer.com/article/10.1186/s40623-022-01726-y/fulltext.html

Rock Magnetic Characterization of Returned Samples From Asteroid (162173) Ryugu: Implications for Paleomagnetic Interpretation and Paleointensity Estimation Reviewed International journal

Masahiko Sato, Yuki Kimura, Satoshi Tanaka, Tadahiro Hatakeyama, Seiji Sugita, Tomoki Nakamuna, Shogo Tachibana, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Fuyuto Terui, Satoru Nakazawa, Sei-ichiro Watanabe, Yuichi Tsuda

JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS Vol. 127 ( 11 ) 2022.11

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

In this study, systematic rock magnetic measurements and saturation isothermal remanent magnetization (SIRM) paleointensity calibration experiments were conducted for the returned samples from C-type asteroid (162173) Ryugu and two carbonaceous chondrites (Orgueil and Tagish Lake) to evaluate the remanence carriers of the Ryugu sample and its ability as a paleomagnetic recorder. Our magnetic measurements show that Ryugu samples exhibit signatures for framboidal magnetite, coarse-grained magnetite, and pyrrhotite, and that framboidal magnetite is the dominant remanence carrier of Ryugu samples in the middle-coercivity range. The SIRM paleointensity constant was obtained for two Ryugu samples, and the median value was 3,318 +/- 1,038 mu T, which is close to the literature's value based on the average among magnetite, titanomagnetite, pyrrhotite, and FeNi alloys and is widely used for SIRM paleointensity experiments. The paleointensity values estimated using the obtained SIRM paleointensity constant indicate a strong magnetic field of the protoplanetary disk, suggesting that Sun's protoplanetary disk existed at the disk location of Ryugu's parent planetesimal when framboidal magnetite precipitated from the aqueous fluid.

DOI： 10.1029/2022JE007405

Web of Science

The Solar System calcium isotopic composition inferred from Ryugu samples Reviewed International coauthorship

Moynier F., Dai W., Yokoyama T., Hu Y., Paquet M., Abe Y., Aleon J., Alexander C. M. O'D., Amari S., Amelin Y., Bajo K. -I., Bizzarro M., Bouvier A., Carlson R. W., Chaussidon M., Choi B. -G., Dauphas N., Davis A. M., Di Rocco T., Fujiya W., Fukai R., Gautam I., Haba M. K., Hibiya Y., Hidaka H., Homma H., Hoppe P., Huss G. R., Ichida K., Iizuka T., Ireland T. R., Ishikawa A., Ito M., Itoh S., Kawasaki N., Kita N. T., Kitajima K., Kleine T., Komatani S., Krot A. N., Liu M. -C., Masuda Y., McKeegan K. D., Morita M., Motomura K., Nakai I., Nagashima K., Nesvorny D., Nguyen A., Nittler L., Onose M., Pack A., Park C., Piani L., Qin L., Russell S. S., Sakamoto N., Schoenbaechler M., Tafla L., Tang H., Terada K., Terada Y., Usui T., Wada S., Wadhwa M., Walker R. J., Yamashita K., Yin Q. -Z., Yoneda S., Young E. D., Yui H., Zhang A. -c., Nakamura T., Naraoka H., Noguchi T., Okazaki R., Sakamoto K., Yabuta H., Abe M., Miyazaki A., Nakato A., Nishimura M., Okada T., Yada T., Yogata K., Nakazawa S., Saiki T., Tanaka S., Terui F., Tsuda Y., Watanabe S. -I., Yoshikawa M., Tachibana S., Yurimoto H.

GEOCHEMICAL PERSPECTIVES LETTERS Vol. 24 2022.10

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

Pieter Tack, Ella De Pauw, Beverley Tkalcec, Miles Lindner, Benjamin Bazi, Bart Vekemans, Frank Brenker, Marco Di Michiel, Masayuki Uesugi, Hisayoshi Yurimoto, Tomoki Nakamura, Kana Amano, Megumi Matsumoto, Yuri Fujioka, Yuma Enokido, Daisuke Nakashima, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Sei-Ichiro Watanabe, Yuichi Tsuda, Laszlo Vincze

Earth, Planets and Space Vol. 74 ( 1 ) 2022.9

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

Abstract

Millimetre-sized primordial rock fragments originating from asteroid Ryugu were investigated using high energy X-ray fluorescence spectroscopy, providing 2D and 3D elemental distribution and quantitative composition information on the microscopic level. Samples were collected in two phases from two sites on asteroid Ryugu and safely returned to Earth by JAXA’s asteroid explorer Hayabusa2, during which time the collected material was stored and maintained free from terrestrial influences, including exposure to Earth’s atmosphere. Several grains of interest were identified and further characterised to obtain quantitative information on the rare earth element (REE) content within said grains, following a reference-based and computed-tomography-assisted fundamental parameters quantification approach. Several orders of magnitude REE enrichments compared to the mean CI chondrite composition were found within grains that could be identified as apatite phase. Small enrichment of LREE was found for dolomite grains and slight enrichment or depletion for the general matrices within the Ryugu rock fragments A0055 and C0076, respectively.

Graphical Abstract

DOI： 10.1186/s40623-022-01705-3

Web of Science

Other Link： https://link.springer.com/article/10.1186/s40623-022-01705-3/fulltext.html

Presolar Stardust in Asteroid Ryugu Reviewed 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

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

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

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

Icarus Vol. 381 page： 115007 - 115007 2022.7

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

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

Monthly Notices of the Royal Astronomical Society Vol. 514 ( 4 ) page： 6173 - 6182 2022.7

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

The JAXA Hayabusa2 mission accomplished the formation of an artificial crater on the asteroid Ryugu. The aim of this work is to analyse the area surrounding the artificial crater and reveal spectral variability compared to the same region before the crater formation, to mineralogically and physically characterize the subsurface exposed material. The crater's investigation focused on the analysis of two regions corresponding to the inner part of crater (the pit and the crater wall/floor), two areas related to ejecta deposited close to the crater, two areas of ejecta moved far from the crater, and two external areas. Each area was investigated both before and after the crater formation, by the study of the photometrically corrected spectral parameters: the 1.9 μm reflectance, the near-infrared spectral slope, and the depth of the bands at 2.7 and 2.8 μm. The subsurface material of the post-crater areas shows deeper absorption bands, a decrease in reflectance, and a reddening in spectral slope with respect to the surface material of pre-crater areas. The subsurface regolith could have experienced a lower OH devolatilization due to space weathering and/or could be composed of finer dark grains than the surface layer. The ejecta reached distances of ~20 m from the impact point, mainly moving in the northern direction; nevertheless, a few ejecta also reached the south-eastern part of crater.

DOI： 10.1093/mnras/stac1547

Web of Science

Scopus

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 2022.4

Extended mission of Hayabusa2 Reviewed 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 2022.4

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 2022.4

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<WATANABE, Sei-ichiro>

Papers - WATANABE, Sei-ichiro