Faculty Profiles - WATANABE, Sei-ichiro

Papers - WATANABE, Sei-ichiro

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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

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

Hayabusa2 Asteroid Sample Return Mission page： 559 - 575 2022.4

Language：English Publishing type：Part of collection (book)

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

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

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

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

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

Open Access

Web of Science

Measurement of surface deformation and cohesion of a granular pile under the effect of centrifugal force Reviewed Open Access

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

MEASUREMENT SCIENCE AND TECHNOLOGY Vol. 32 ( 12 ) 2021.12

Spectrally blue hydrated parent body of asteroid (162173) Ryugu Reviewed International coauthorship Open Access

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

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

<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

Open Access

Web of Science

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

Magma source transition of lunar mare volcanism at 2.3 Ga Reviewed Open Access

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

Meteoritics & Planetary Science 2017.6

Characteristics of Natural Remanence Records in Fine-Grained Particles Returned From Asteroid Ryugu Reviewed Open Access

Sato, M., Kumura, Y., Hatakeyama, T., Nakamura, T., Okuzumi, S., Watanabe S., Sugita, S., Tanaka, S., Tachibana, S., Yurimoto, H., Noguchi, T., Okazaki, R., Yabuta, H., Naraoka, H., Sakamoto, K., Yada, T., Nishimura, M., Nakato, A., Miyazaki, A., Yogata, K., Abe, M., Okada, T., Usui, T., Yoshikawa, M., Saiki, T., Terui, F., Nakazawa S., Tsuda, Y.

Journal of Geophysical Research: Planets Vol. 131 ( 2 ) page： e2025JE009265 - 20 pp 2026.2

Elastic Properties of Returned Samples From Asteroid (162173) Ryugu Reviewed Open Access

Onodera, K., Ino, Y., Tanaka, S., Kawamura, T., Ishizaki, T., Kanemaru, R., Fukai, R., Tsuji, T., Nakamura, T., Nakashima, D., Uesugi, M., Tachibana, S., Sugita, S., Yurimoto, H., Noguchi, T., Okazaki, R., Yabuta, H., Naraoka, H., Sakamoto, K., Yada, T., Bishimura, M., Nakato, A., miyazaki, A., Yogata, K., Abe, M., Okada, T., Usui, T., Yoshikawa, M., Sakai, T., Terui, F., Nakazawa, S., Watanabe, S., Tsuda, Y.

Journal of Geophysical Research: Planets Vol. 130 page： e2025JE008944 - 15 pp 2025.10

Water in Ryugu as a property of processes in its parent body Reviewed International coauthorship Open Access

Le Pivert-Jolivet, T., Brunetto, R., Pilorget, C., Baklouti, D., Bibring, J.-P., Carter, J., Hamm, V., Hatakeda, K., Jiang, T., Lantz, C., Loizeau, D., Mahike, M., Nakato, A., Okada, T., Riu, L., Usui, T., Yada, T., Yogata, K., De Leon, J., Hitomi, Y., Kumagai, K., Licandro, J., Miyazaki, A., Nagashima, K., Nakato, A., Nishimura, M., Ojima, T., Sugiyama, Y., Tahara, R., Saiki, T., Tanaka, S., Watanabe, S., Tsuda, Y.

Astronomy & Astrophysics Vol. 695 page： A168 - 10 pp 2025.4

A primordial noble gas component discovered in the Ryugu asteroid and its implications Reviewed International coauthorship International journal Open Access

Verchovsky, AB; Abernethy, FAJ; Anand, M; Franchi, IA; Grady, MM; Greenwood, RC; Barber, SJ; Suttle, M; Ito, M; Tomioka, N; Uesugi, M; Yamaguchi, A; Kimura, M; Imae, N; Shirai, N; Ohigashi, T; Liu, MC; Uesugi, K; Nakato, A; Yogata, K; Yuzawa, H; Karouji, Y; Nakazawa, S; Okada, T; Saiki, T; Tanaka, S; Terui, F; Yoshikawa, M; Miyazaki, A; Nishimura, M; Yada, T; Abe, M; Usui, T; Watanabe, S; Tsuda, Y; Hirahara, K; Sakurai, I; Okado, I; Findlay, R; Malley, JA; Zhao, XC; Pilorget, C; Bebring, JP; Loizeau, D; Carter, J; Riu, L; Le Pivert-Jolivet, T; McCain, K; Matsuda, N

NATURE COMMUNICATIONS Vol. 15 ( 1 ) 2024.9

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

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

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

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

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.

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

Icarus Vol. 168 page： 60 - 79 2004

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

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

Hugoniot equation of state of basalt Reviewed

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

Collision and Tidal Interaction between Planetesimals. Reviewed

Watanabe, S., Miyama, S. M.

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

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

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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Papers - WATANABE, Sei-ichiro