Solar System Exploration for Aqua-planetology

2020 Fiscal Year Annual Research Report

• Project Area: Aqua planetology
• Project/Area Number: 17H06459
• Research Institution: Japan Aerospace EXploration Agency
• Principal Investigator: 臼井 寛裕 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 教授 (60636471)
• Co-Investigator(Kenkyū-buntansha): 荒川 政彦 神戸大学, 理学研究科, 教授 (10222738) ; 中村 智樹 東北大学, 理学研究科, 教授 (20260721) ; 岡田 達明 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 准教授 (30321566) ; 諸田 智克 東京大学, 大学院理学系研究科(理学部), 准教授 (30415898) ; 渡邊 誠一郎 名古屋大学, 環境学研究科, 教授 (50230967) ; 竝木 則行 国立天文台, RISE月惑星探査プロジェクト, 教授 (50274428)
• Project Period (FY): 2017-06-30 – 2022-03-31
• Keywords: 惑星探査 / はやぶさ２ / 火星探査計画 / 水・物質循環

Outline of Annual Research Achievements

本計画研究は、「第1段階（2017-2018年度）：はやぶさ2探査での観測データの取得準備、近傍観測」、「第2段階（2019-2020年度）：微惑星・水惑星・氷衛星の水・物質循環に関する地球科学データの抽出」、「第3段階（2021年度）：微惑星・水惑星・氷衛星の水・物質循環モデルの構築」からなる。本年度は、第二段階の最終年であり、水惑星天体から得られた観測データの解析をさらに進め、論文化に集中した。特に、はやぶさ２探査では、世界初となる人口クレーター形成により露出した小惑星リュウグウの内部物質データの取得にも成功した。これらの結果は、査読付き原著論文としてScience誌（Arakawa et al. 2020; Morota et al. 2020）やNature姉妹誌（Kitazato, Nakamura, Morota, Namiki, Okada, Watanabe et al. 2021）に掲載されることとなった。

本年度は、他の計画班との融合研究も進み、特にB01分析班と行った研究からは、火星雪物の発見（Koike, Usui et al. 2020 Nature Communications）や、A03理論班と行った准惑星セレスの分光観測データ解析法の開発（Kurokawa, Usui et al. 2020 JGR）が特筆される。また、将来の火星探査を見据えた予察的な研究も融合研究から生まれている（Usui et al. 2020 Space Science Review; Hyodo et al. 2020 Scientific Report）。

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

はやぶさ2探査が計画通りに進んでいるため、その解析および成果発表とも予定通り進んでいる。

Strategy for Future Research Activity

プログラム最終年である２０２１年度に向け、融合研究を加速すべく、地質学をバックグラウンドとするPDを新規に雇用することになっている。

Research Products

• [Journal Article] Crater depth-to-diameter ratios on asteroid 162173 Ryugu (2021)
  • Author(s): Noguchi Rina、Hirata Naoyuki、Hirata Naru、Shimaki Yuri、Nishikawa Naoki、Tanaka Sayuri、Sugiyama Takaaki、Morota Tomokatsu、Matsuoka Moe、Kanamaru Masanori、Watanabe Sei-ichiro et al.
  • Journal Title: Icarus Volume: 354 Pages: 114016～114016
  • DOI: 10.1016/j.icarus.2020.114016
  • Peer Reviewed
• [Journal Article] Spectral characterization of the craters of Ryugu as observed by the NIRS3 instrument on-board Hayabusa2 (2021)
  • Author(s): Riu Lucie、Pilorget Cedric、Milliken Ralph、Kitazato Kohei、Nakamura Tomoki、Cho Yuichiro、Matsuoka Moe、Sugita Seiji、Abe Masanao、Matsuura Shuji、Ohtake Makiko、Kameda Shingo、Sakatani Naoya、Tatsumi Eri、Yokota Yasuhiro、Iwata Takahiro
  • Journal Title: Icarus Volume: 357 Pages: 114253～114253
  • DOI: 10.1016/j.icarus.2020.114253
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Experimental study concerning the oblique impact of low- and high-density projectiles on sedimentary rocks (2021)
  • Author(s): Suzuki Ayako I.、Fujita Yoichi、Harada Shunya、Kiuchi Masato、Koumoto Yasunari、Matsumoto Eri、Omura Tomomi、Shigaki Sae、Taguchi Erine、Tsujido Sayaka、Kurosawa Kosuke、Hasegawa Sunao、Hirai Takayuki、Tabata Makoto、Tamura Hideki、Kadono Toshihiko、Nakamura Akiko M.、Arakawa Masahiko、Sugita Seiji、Ishibashi Ko
  • Journal Title: Planetary and Space Science Volume: 195 Pages: 105141～105141
  • DOI: 10.1016/j.pss.2020.105141
  • Peer Reviewed
• [Journal Article] Simulation of Seismic Wave Propagation on Asteroid Ryugu Induced by The Impact Experiment of The Hayabusa2 Mission: Limited Mass Transport by Low Yield Strength of Porous Regolith (2021)
  • Author(s): Nishiyama G.、Kawamura T.、Namiki N.、Fernando B.、Leng K.、Onodera K.、Sugita S.、Saiki T.、Imamura H.、Takagi Y.、Yano H.、Hayakawa M.、Okamoto C.、Sawada H.、Tsuda Y.、Ogawa K.、Nakazawa S.、Iijima Y.
  • Journal Title: Journal of Geophysical Research: Planets Volume: 126 Pages: -
  • DOI: 10.1029/2020JE006594
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Characterization of D‐Type Spectra Based on Hyperspectral Remote Sensing of the Lunar Surface (2021)
  • Author(s): Yamamoto Satoru、Watanabe Sei‐ichiro
  • Journal Title: Journal of Geophysical Research: Planets Volume: 126 Pages: -
  • DOI: 10.1029/2020JE006669
  • Peer Reviewed
• [Journal Article] Thermally altered subsurface material of asteroid (162173) Ryugu (2021)
  • Author(s): Kitazato K.、Milliken R. E.、Iwata T.、Abe M.、Ohtake M.、Matsuura S.、Takagi Y.、Nakamura T.、Hiroi T.、Matsuoka M.、Riu L.、Nakauchi Y.、Tsumura K.、Arai T.、Senshu H.、.Morota T..、Sakatani N.、Namiki N.、Okada T.、Shimaki Y.、Noguchi R.、Watanabe S. et al.
  • Journal Title: Nature Astronomy Volume: 5 Pages: 246～250
  • DOI: 10.1038/s41550-020-01271-2
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Size of particles ejected from an artificial impact crater on asteroid 162173 Ryugu (2021)
  • Author(s): Wada K.、Ishibashi K.、Kimura H.、Arakawa M.、Sawada H.、Ogawa K.、Shirai K.、Honda R.、Iijima Y.、Kadono T.、Sakatani N.、Mimasu Y.、Toda T.、Shimaki Y.、Nakazawa S.、Hayakawa H.、Saiki T.、Takagi Y.、Imamura H.、Okamoto C.、Hayakawa M.、Hirata N.、Yano H.
  • Journal Title: Astronomy & Astrophysics Volume: 647 Pages: A43～A43
  • DOI: 10.1051/0004-6361/202039777
  • Peer Reviewed / Open Access
• [Journal Article] Alignment determination of the Hayabusa2 laser altimeter (LIDAR) (2021)
  • Author(s): Noda Hirotomo、Senshu Hiroki、Matsumoto Koji、Namiki Noriyuki、Mizuno Takahide、Sugita Seiji、Abe Shinsuke、Araki Hiroshi、Asari Kazuyoshi、Cho Yuichiro、Fujii Atsushi、Hayakawa Masahiko、Matsuoka Moe、Morota Tomokatsu、Watanabe Sei-ichiro et al.
  • Journal Title: Earth, Planets and Space Volume: 73 Pages: -
  • DOI: 10.1186/s40623-020-01342-8
  • Peer Reviewed
• [Journal Article] EXAFS Determination of Clay Minerals in Martian Meteorite Allan Hills 84001 and Its Implication for the Noachian Aqueous Environment (2021)
  • Author(s): Nakada Ryoichi、Tanabe Gaku、Kajitani Iori、Usui Tomohiro、Shidare Masashi、Yokoyama Tetsuya
  • Journal Title: Minerals Volume: 11 Pages: 176～176
  • DOI: 10.3390/min11020176
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The Importance of Phobos Sample Return for Understanding the Mars-Moon System (2020)
  • Author(s): Usui Tomohiro、Bajo Ken-ichi、Fujiya Wataru、Furukawa Yoshihiro、Koike Mizuho、Miura Yayoi N.、Sugahara Haruna、Tachibana Shogo、Takano Yoshinori、Kuramoto Kiyoshi
  • Journal Title: Space Science Reviews Volume: 216 Pages: -
  • DOI: 10.1007/s11214-020-00668-9
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Hayabusa2 Landing Site Selection: Surface Topography of Ryugu and Touchdown Safety (2020)
  • Author(s): Kikuchi Shota、Watanabe Sei-ichiro、Morota Tomokatsu、Michikami Tatsuhiro、Sakatani Naoya、Okada Tatsuaki、Noguchi Rina、Nakamura Tomoki、Matsuoka Moe、Namiki Noriyuki et al.
  • Journal Title: Space Science Reviews Volume: 216 Pages: -
  • DOI: 10.1007/s11214-020-00737-z
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Motion reconstruction of the small carry-on impactor aboard Hayabusa2 (2020)
  • Author(s): Saiki Takanao、Mimasu Yuya、Takei Yuto、Yamada Manabu、Sawada Hirotaka、Ogawa Kazunori、Ogawa Naoko、Takeuchi Hiroshi、Miura Akira、Shimaki Yuri、Arakawa Masahiko、Watanabe Sei-ichiro et al.
  • Journal Title: Astrodynamics Volume: 4 Pages: 289～308
  • DOI: 10.1007/s42064-020-0077-6
  • Peer Reviewed
• [Journal Article] Hayabusa2’s station-keeping operation in the proximity of the asteroid Ryugu (2020)
  • Author(s): Takei Yuto、Saiki Takanao、Yamamoto Yukio、Mimasu Yuya、Takeuchi Hiroshi、Ikeda Hitoshi、Ogawa Naoko、Terui Fuyuto、Ono Go、Yoshikawa Kent、Takahashi Tadateru、Sawada Hirotaka、Hirose Chikako、Kikuchi Shota、Fujii Atsushi、Iwata Takahiro、Nakazawa Satoru、Okada Tatsuaki et al.
  • Journal Title: Astrodynamics Volume: 4 Pages: 349～375
  • DOI: 10.1007/s42064-020-0083-8
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Hayabusa2's kinetic impact experiment: Operational planning and results (2020)
  • Author(s): 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
  • Journal Title: Acta Astronautica Volume: 175 Pages: 362～374
  • DOI: 10.1016/j.actaastro.2020.05.064
  • Peer Reviewed
• [Journal Article] Geochemically heterogeneous Martian mantle inferred from Pb isotope systematics of depleted shergottites (2020)
  • Author(s): Moriwaki Ryota、Usui Tomohiro、Tobita Minato、Yokoyama Tetsuya
  • Journal Title: Geochimica et Cosmochimica Acta Volume: 274 Pages: 157～171
  • DOI: 10.1016/j.gca.2020.01.014
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Characterizing irradiated surfaces using IR spectroscopy (2020)
  • Author(s): Brunetto R.、Lantz C.、Nakamura T.、Baklouti D.、Le Pivert-Jolivet T.、Kobayashi S.、Borondics F.
  • Journal Title: Icarus Volume: 345 Pages: 113722～113722
  • DOI: 10.1016/j.icarus.2020.113722
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Thermophysical properties of the surface of asteroid 162173 Ryugu: Infrared observations and thermal inertia mapping (2020)
  • Author(s): Shimaki Yuri、Senshu Hiroki、Sakatani Naoya、Okada Tatsuaki、Fukuhara Tetsuya、Tanaka Satoshi、Taguchi Makoto、Arai Takehiko、Demura Hirohide、Noguchi Rina、Watanabe Sei-ichiro et al.
  • Journal Title: Icarus Volume: 348 Pages: 113835～113835
  • DOI: 10.1016/j.icarus.2020.113835
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Spin-driven evolution of asteroids' top-shapes at fast and slow spins seen from (101955) Bennu and (162173) Ryugu (2020)
  • Author(s): 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.
  • Journal Title: Icarus Volume: 352 Pages: 113946～113946
  • DOI: 10.1016/j.icarus.2020.113946
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Characterization of the Ryugu surface by means of the variability of the near-infrared spectral slope in NIRS3 data (2020)
  • Author(s): 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.、Hirata N.、Matsumoto K.、Tsuda Y.
  • Journal Title: Icarus Volume: 351 Pages: 113959～113959
  • DOI: 10.1016/j.icarus.2020.113959
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Major/trace elements and Sr-Nd-Pb isotope systematics of lavas from lakes Barombi Mbo and Barombi Koto in the Kumba graben, Cameroon volcanic line: Constraints on petrogenesis (2020)
  • Author(s): Asaah A.N.E.、Yokoyama T.、Aka F.T.、Iwamori H.、Kuritani T.、Usui T.、Gountie Dedzo M.、Tamen J.、Hasegawa T.、Fozing E.M.、Wirmvem M.J.、Nche A.L.
  • Journal Title: Journal of African Earth Sciences Volume: 161 Pages: 103675～103675
  • DOI: 10.1016/j.jafrearsci.2019.103675
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Climate Simulations of Early Mars With Estimated Precipitation, Runoff, and Erosion Rates (2020)
  • Author(s): Ramirez Ramses M.、Craddock Robert A.、Usui Tomohiro
  • Journal Title: Journal of Geophysical Research: Planets Volume: 125 Pages: -
  • DOI: 10.1029/2019JE006160
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Radar Sounding of Subsurface Structure in Eastern Coprates and Capri Chasmata, Mars (2020)
  • Author(s): Noguchi Rina、Ishiyama Ken、Kumamoto Atsushi、Uemura Chihiro、Kasaba Yasumasa、Usui Tomohiro、Oura Aina、Shoji Daigo
  • Journal Title: Geophysical Research Letters Volume: 47 Pages: -
  • DOI: 10.1029/2020GL088556
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A Probabilistic Approach to Determination of Ceres' Average Surface Composition From Dawn Visible‐Infrared Mapping Spectrometer and Gamma Ray and Neutron Detector Data (2020)
  • Author(s): Kurokawa H.、Ehlmann B. L.、De Sanctis M. C.、Lapotre M. G. A.、Usui T.、Stein N. T.、Prettyman T. H.、Raponi A.、Ciarniello M.
  • Journal Title: Journal of Geophysical Research: Planets Volume: 125 Pages: -
  • DOI: 10.1029/2020JE006606
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] In-situ preservation of nitrogen-bearing organics in Noachian Martian carbonates (2020)
  • Author(s): Koike Mizuho、Nakada Ryoichi、Kajitani Iori、Usui Tomohiro、Tamenori Yusuke、Sugahara Haruna、Kobayashi Atsuko
  • Journal Title: Nature Communications Volume: 11 Pages: -
  • DOI: 10.1038/s41467-020-15931-4
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Collisional history of Ryugu’s parent body from bright surface boulders (2020)
  • Author(s): Tatsumi E.、Sugimoto C.、Riu L.、Sugita S.、Nakamura T.、Hiroi T.、Morota T.、Popescu M.、Michikami T.、Kitazato K.、Matsuoka M.、Kameda S.、Honda R.、Yamada M.、Sakatani N.、Kouyama T.、Yokota Y.、Honda C.、Suzuki H.、Cho Y.、Ogawa K.、Hayakawa M.、Okada T.、Namiki N.、Arakawa M.、Watanabe S. et al.
  • Journal Title: Nature Astronomy Volume: 5 Pages: 39～45
  • DOI: 10.1038/s41550-020-1179-z
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Highly porous nature of a primitive asteroid revealed by thermal imaging (2020)
  • Author(s): Okada Tatsuaki、Fukuhara Tetsuya、Tanaka Satoshi、Taguchi Makoto、Arai Takehiko、Senshu Hiroki、Sakatani Naoya、Shimaki Yuri、Namiki Noriyuki、Arakawa Masahiko、Matsuoka Moe、Michikami Tatsuhiro、Morota Tomokatsu、Noguchi Rina、Watanabe Seiichiro et al.
  • Journal Title: Nature Volume: 579 Pages: 518～522
  • DOI: 10.1038/s41586-020-2102-6
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Global photometric properties of (162173) Ryugu (2020)
  • Author(s): Tatsumi E.、Domingue D.、SchrÖder S.、Yokota Y.、Kuroda D.、Ishiguro M.、Hasegawa S.、Hiroi T.、Honda R.、Hemmi R.、Le Corre L.、Sakatani N.、Morota T.、Yamada M.、Kameda S.、Koyama T.、Suzuki H.、Cho Y.、Yoshioka K.、Matsuoka M. et al.
  • Journal Title: Astronomy & Astrophysics Volume: 639 Pages: A83～A83
  • DOI: 10.1051/0004-6361/201937096
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Surface roughness of asteroid (162173) Ryugu and comet 67P/Churyumov?Gerasimenko inferred from in situ observations (2020)
  • Author(s): Otto K A、Matz K-D、SchrÖder S E、Parekh R、Krohn K、Honda R、Kameda S、Jaumann R、Schmitz N、Stephan K、Sugita S、Tatsumi E、Ho T-M、Koncz A、Trauthan F、Cho Y、Hayakawa M、Honda C、Kouyama T、Matsuoka M、Morota T et al.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 500 Pages: 3178～3193
  • DOI: 10.1093/mnras/staa3314
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] An artificial impact on the asteroid (162173) Ryugu formed a crater in the gravity-dominated regime (2020)
  • Author(s): Arakawa M.、Sakatani N.、Morota T.、Matsuoka M.、Watanabe S.、Okada T.、Namiki N.、Noguchi R. et al.
  • Journal Title: Science Volume: 368 Pages: 67～71
  • DOI: 10.1126/science.aaz1701
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Sample collection from asteroid (162173) Ryugu by Hayabusa2: Implications for surface evolution (2020)
  • Author(s): Morota T.、Sakatani N.、Matsuoka M.、Michikami T.、Nakamura T.、Noguchi R.、Namiki N.、Arakawa M.、Okada T.、Shimaki Y.、Watanabe S. et al.
  • Journal Title: Science Volume: 368 Pages: 654～659
  • DOI: 10.1126/science.aaz6306
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Dynamic precise orbit determination of Hayabusa2 using laser altimeter (LIDAR) and image tracking data sets (2020)
  • Author(s): Yamamoto Keiko、Otsubo Toshimichi、Matsumoto Koji、Noda Hirotomo、Namiki Noriyuki、Takeuchi Hiroshi、Ikeda Hitoshi、Yoshikawa Makoto、Yamamoto Yukio、Senshu Hiroki、Mizuno Takahide、Watanabe Sei-ichiro et al.
  • Journal Title: Earth, Planets and Space Volume: 72 Pages: -
  • DOI: 10.1186/s40623-020-01213-2
  • Peer Reviewed
• [Journal Article] Vanadium micro-XANES determination of oxygen fugacity in olivine-hosted glass inclusion and groundmass glasses of martian primitive shergottite Yamato 980459 (2020)
  • Author(s): Nakada Ryoichi、Usui Tomohiro、Ushioda Masashi、Takahashi Yoshio
  • Journal Title: American Mineralogist Volume: 105 Pages: 1695～1703
  • DOI: 10.2138/am-2020-7321
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Design and Reconstruction of the Hayabusa2 Precision Landing on Ryugu (2020)
  • Author(s): Kikuchi Shota、Terui Fuyuto、Ogawa Naoko、Saiki Takanao、Ono Go、Yoshikawa Kent、Takei Yuto、Mimasu Yuya、Ikeda Hitoshi、Sawada Hirotaka、Wal Stefaan Van、Sugita Seiji、Watanabe Sei-ichiro、Tsuda Yuichi
  • Journal Title: Journal of Spacecraft and Rockets Volume: 57 Pages: 1033～1060
  • DOI: 10.2514/1.A34683
  • Peer Reviewed
• [Journal Article] Space Weathering Simulation with Low-energy Laser Irradiation of Murchison CM Chondrite for Reproducing Micrometeoroid Bombardments on C-type Asteroids (2020)
  • Author(s): Matsuoka Moe、Nakamura Tomoki、Hiroi Takahiro、Okumura Satoshi、Sasaki Sho
  • Journal Title: The Astrophysical Journal Volume: 890 Pages: L23～L23
  • DOI: 10.3847/2041-8213/ab72a4
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Impact Experiment on Asteroid (162173) Ryugu: Structure beneath the Impact Point Revealed by In Situ Observations of the Ejecta Curtain (2020)
  • Author(s): Kadono Toshihiko、Arakawa Masahiko、Honda Rie、Ishibashi Ko、Ogawa Kazunori、Sakatani Naoya、Sawada Hirotaka、Shimaki Yuri、Shirai Kei、Sugita Seiji、Wada Koji
  • Journal Title: The Astrophysical Journal Volume: 899 Pages: L22～L22
  • DOI: 10.3847/2041-8213/aba949
  • Peer Reviewed
• [Presentation] A HYBRID SPH-SSDEM FRAMEWORK FOR END-TO-END IMPACT CRATERING MODELING (2021)
  • Author(s): Zhang, M.; Jutzi, M.; Michel, P.; Raducan, S. D.; Arakawa, M.
  • Organizer: 52nd Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] A New Model of Seismicity on Asteroids Implied by the SCI Experiment of the Hayabusa2 Mission: Insights from the Existence of Boulders Perched on Other Boulders (2021)
  • Author(s): Nishiyama, G.; Kawamura, T.; Fernando, B.; Leng, K.; Onodera, K.; Sugita, S.; Saiki, T.; Imamura, H.; Takagi, Y.; Yano, H.; Hayakawa, M.; Okamoto, C.; Sawada, H.; Tsuda, Y.; Nakazawa, S.; Iijima, Y.
  • Organizer: 52nd Lunar and Planetary Science Confeernce
  • Int'l Joint Research
• [Presentation] ANOMALOUSLY POROUS AND DARK ROCKS ON ASTEROID (162173) RYUGU (2021)
  • Author(s): Sakatani, N.; Okada, T.; Morota, T.; Matsuoka, M.; Arakawa, M. et al.
  • Organizer: 52nd Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] Crater Size Scaling Law and Impact-Induced Seismic Shaking on Rubble-Pile Asteroids (2021)
  • Author(s): Yamamoto, Y.; Arakawa, M.; Yasui, M.; Hasegawa, S.; Yokota, Y.; Okawa, H.; Sugimura, R.
  • Organizer: 52nd Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] Experimental Study on Impact Craters Formed on Mountain-Like Surface Topography of Asteroids (2021)
  • Author(s): Yusaku Yokota, Masahiko Arakawa, Minami Yasui, Yuya Yamamoto, Hatsune Okawa, Sunao Hasegawa
  • Organizer: 52nd Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] Impact Cratering Experiments on Granular Targets Simulating Surface Layer on Asteroid 162173 Ryugu: Crater Scaling Law and Impact-Induced Seismic Shaking (2021)
  • Author(s): Yasui, M.; Arakawa, M.; Okawa, H.; Hasegawa, S.
  • Organizer: 52nd Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] Impact Strength of Ryugu's Boulder Inferred from Meter-Sized Crater Statistics (2021)
  • Author(s): Morota et al.
  • Organizer: LPSC2021
  • Int'l Joint Research
• [Presentation] OKEANOS: SOLAR POWER SAIL EXPLORATION TO RELICS OF THE PLANETARY MIGRATION (2021)
  • Author(s): Tatsuaki Okada, Takahiro Iwata, Hajime Yano, Shuji Matsuura, Daisuke Yonetoku, Ayako Matsuoka, Yoko Kebukawa, Stephan Ulamec, Osamu Mori
  • Organizer: COSPAR2021
  • Int'l Joint Research / Invited
• [Presentation] THERMAL INFRARED IMAGER ONBOARD HERA TO OBSERVE S-TYPE BINARY ASTEROID DIDYMOS (2021)
  • Author(s): T. Okada, T. Fukuhara, S. Tanaka, N. Sakatani, Y. Shimaki, T. Arai, H. Senshu, H. Demura, T. Kouyama, T. Sekiguchi, Hera TIRI Team
  • Organizer: 52nd Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] THERMAL INFRARED IMAGING OF BINARY ASTEROID DIDYMOS (2021)
  • Author(s): Tatsuaki Okada, Tetsuya Fukuhara, Makoto Yoshikawa, Yuri Shimaki, Naoya Sakatani, Hiroki Senshu, Hirohide Demura, Toru Kouyama, Tomohiko Sekiguchi, Satoshi Tanaka
  • Organizer: COSPAR2021
  • Int'l Joint Research
• [Presentation] THERMAL PROPERTIES OF BOULDERS ON C-TYPE ASTEROID 162173 RYUGU OBSERVED BY HAYABUSA2 TIR DURING LOW ALTITUDE OPERATIONS (2021)
  • Author(s): A. Ohsugi, N. Sakatani, Y. Shimaki, T. Arai, H. Senshu, T. Kouyama, H. Demura, T. Sekiguchi, S. Tanaka, T. Okada
  • Organizer: 52nd Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] Three-Dimensional Tracking of Various Sized Glass Beads Ejected from Impact Crater (2021)
  • Author(s): Okawa, H.; Arakawa, M.; Yasui, M.; Hasegawa, S.; Yokota, Y.; Yamamoto, Y.
  • Organizer: 52nd Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] YORP EFFECT ON ASTEROID 162173 RYUGU AND ITS SPIN EVOLUTION (2021)
  • Author(s): M. Kanamaru, S. Sasaki, T. Morota, Y. Cho, E. Tatsumi, M. Hirabayashi, N. Hirata, H. Senshu, Y. Shimaki, N. Sakatani, S. Tanaka, T. Okada, T. Usui, S. Sugita, S. Watanabe
  • Organizer: 52nd Lunar and Planetary Science Conference
  • Int'l Joint Research
• [Presentation] はやぶさ２の近傍探査による理学成果 (2021)
  • Author(s): 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, 橘省吾, 荒川政彦, はやぶさ, サイエンスチーム
  • Organizer: 宇宙科学シンポジウム
  • Invited
• [Presentation] はやぶさ２の成果から見えてきた太陽系物質輸送 (2021)
  • Author(s): 渡邊誠一郎
  • Organizer: 東北大学惑星圏研究会
  • Invited
• [Presentation] 「はやぶさ2」タッチダウン運用で得られたRyugu表面の詳細な熱物性構造 (2020)
  • Author(s): 田中智, 菊地翔太, 白井慶, 坂谷尚哉, 嶌生有理, 岡田達明, 福原哲哉, 千秋博紀, 荒井武彦, 神山徹, 出村裕英, 関口朋彦
  • Organizer: 日本惑星科学会秋季講演会
• [Presentation] Constraints on the surface materials of Ryugu from spectral and water analysis of experimentally-heated CI carbonaceous chondrite (2020)
  • Author(s): K. Amano, T. Nakamura, F. Usui, S. Okumura, M. E. Zolensky
  • Organizer: Goldschmidt 2020
• [Presentation] Effects of surface topography on ejecta growth and crater formation process (2020)
  • Author(s): Yusaku Yokota, Masahiko Arakawa, Minami Yasui, Yuya Yamamoto, Hatsune Okawa, Sunao Hasegawa
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research
• [Presentation] Evaluation of Surface Temperature Variation on Asteroid Ryugu caused by Space Weathering (2020)
  • Author(s): Takehiko Arai, Tatsuaki Okada, Satoshi Tanaka, Tetsuya Fukuhara, Hirohide Demura, Naoya Sakatani, Toru Kouyama, Yuri Shimaki, Hiroki Senshu, Tomohiko Sekiguchi, Jun Takita
  • Organizer: JpGU-AGU2020
  • Int'l Joint Research
• [Presentation] Hera搭載熱赤外カメラTIRIの開発 (2020)
  • Author(s): 岡田達明, 福原哲哉, 田中智, 千秋博紀, 坂谷尚哉, 嶌生有理, 荒井武彦, 神山徹, 出村裕英, 関口朋彦
  • Organizer: 日本惑星科学会秋季講演会
• [Presentation] Highly Porous Asteroid 162173 Ryugu Derived from Lowest Temperatures in a Day (2020)
  • Author(s): Tatsuaki Okada, Tetsuya Fukuhara, Satoshi Tanaka, Takehiko Arai, Naoya Sakatani, Yuri Shimaki, Hiroki Senshu, Hirohide Demura, Kentaro Suko, Tomohiko Sekiguchi, Toru Kouyama, Ayumu Ohsugi
  • Organizer: JpGU-AGU2020
  • Int'l Joint Research
• [Presentation] Highly porous nature of C-type asteroid 162173 Ryugu revealed by thermal imaging from Hayabusa2 (2020)
  • Author(s): Tatsuaki Okada, Satoshi Tanaka, Yuri Shimaki, Naoya Sakatani, Takehiko Arai, Hiroki Senshu, Hirohide Demura, Toru Kouyama, Tomohiko Sekiguchi, Tetsuya Fukuhara
  • Organizer: Europlanet Science Congress 2020
  • Int'l Joint Research / Invited
• [Presentation] HR 3D element distribution by SR-XRF tomography of CM2 material as analog for material returned in Hayabusa2 (2020)
  • Author(s): B.J. Tkalcec, F. E. Brenker, P. Tack, E. De Pauw, B. Vekemans, L. Vincze, T. Nakamura, M. Matsumoto, K. Amano, M. Takahasi, Y. Fujioka, E. Kagawa, G. Falkenberg
  • Organizer: Goldschmidt 2020
• [Presentation] Hyperspectral imaging of carbonaceous chondrites in view of the Hayabusa2 sample return (2020)
  • Author(s): Rosario Brunetto, Alice Aleon-Toppani, Zelia Dionnet, Stefano Rubino, Yann Arribard, Donia Baklouti, Ferenc Borondics, Zahia Djouadi, Cateline Lantz, Megumi Matsumoto, Moe Matsuoka, Tomoki Nakamura, Miki Takahashi, David Troadec, and Akira Tsuchiyama
  • Organizer: European Planetary Science Congress
• [Presentation] Impact experiments for crater scaling laws and impact-induced seismic shaking on rubble-pile asteroids (2020)
  • Author(s): Yuya Yamamoto, Masahiko Arakawa, Minami Yasui, Sunao Hasegawa, Ryo Sugimura, Yusaku Yokota, Hatsune Okawa
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research
• [Presentation] Irradiation experiments to reproduce space weathering of primitive asteroids (2020)
  • Author(s): R. Brunetto, C. Lantz, S. Rubino, D. Baklouti, F. Borondics, H. Leroux, T. Nakamura
  • Organizer: European Conference on Laboratory Astrophysics
• [Presentation] Mission Status of Hayabusa2, Science Highlights, and Outlook for Sample Analyses (2020)
  • Author(s): 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
  • Organizer: Europlanet Science Congress 2020
  • Int'l Joint Research / Invited
• [Presentation] Occurrence of tochilinite at initial alteration stages in CM chondrites (2020)
  • Author(s): Y. Enokido, T. Nakamura, M. Matsumoto
  • Organizer: Goldschmidt 2020
• [Presentation] Reflectance spectra measurement plan of captured samples from Ryugu: current status (2020)
  • Author(s): M. Matsuoka, T.Nakamura et al.
  • Organizer: AGU
• [Presentation] Resurfacing processes on asteroid (162173) Ryugu caused by an artificial impact of Hayabusa2’s Small Carry-on Impactor (2020)
  • Author(s): Masahiko Arakawa
  • Organizer: 52nd Meeting of the AAS Division for Planetary Sciences
  • Int'l Joint Research
• [Presentation] Seismic wave propagation on asteroid Ryugu induced by the impact experiment of the Hayabusa2 mission (2020)
  • Author(s): 西山学、川村 太一、並木 則行、Fernando Benjamin、Leng Kuangdai、佐伯 孝尚、今村 裕志、高木 靖彦、白井 慶、早川 雅彦、岡本 千里、澤田 弘崇、津田 雄一、小川 和律、荒川 政彦
  • Organizer: 地球惑星科学連合合同大会2020
• [Presentation] Simulation of seismic wave propagation on Ryugu induced by the SCI impact experiment of the Hayabusa2 mission (2020)
  • Author(s): G. Nishiyama, T. Kawamura, N. Namiki, B. Fernando, K. Leng, K. Onodera, S. Sugita, T. Saiki, H. Imamura, Y. Takagi, K. Shirai, M. Hayakawa, C. Okamoto, H. Sawada, Y. Tsuda, K. Ogawa, S. Nakazawa, Y. Iijima
  • Organizer: American Geophysical Union Fall Meeting 2020
  • Int'l Joint Research
• [Presentation] Sugars in carbonacesous chondrites (2020)
  • Author(s): Yoshihiro Furukawa, Yoshito Chikaraishi, Naohiko Ohkouchi, Nanako O. Ogawa, Daniel P. Glavin, Jason P. Dworkin, Chiaki Abe, and Tomoki Nakamura
  • Organizer: Goldschmidt 2020
• [Presentation] Temperature variations of boulders on Ryugu observed in Hayabusa2 decent operations (2020)
  • Author(s): Ayumu Ohsugi, Naoya Sakatani, Yuri Shimaki, Hiroki Senshu, Takehiko Arai, Hirohide Demura, Satoshi Tanaka, Tetsuya Fukuhara, Tatsuaki Okada
  • Organizer: JpGU-AGU2020
  • Int'l Joint Research
• [Presentation] The ESA Hera mission: rendezvous with a binary asteroid and planetary defense (2020)
  • Author(s): Patrick Michel, Tatsuaki Okada, Masahiko Arakawa et al.
  • Organizer: JpGU-AGU2020
  • Int'l Joint Research / Invited
• [Presentation] THERMAL IMAGER TO REVEAL SURFACE PHYSICAL STATE OF ASTEROIDS (2020)
  • Author(s): Tatsuaki Okada, Tetsuya Fukuhara, Makoto Yoshikawa
  • Organizer: Apophis T-9 Years
  • Int'l Joint Research
• [Presentation] Thermal Infrared Multi-band Imager for the Hera Mission (2020)
  • Author(s): Tatsuaki Okada, Tetsuya Fukuhara, Satoshi Tanaka, Takehiko Arai, Naoya Sakatani, Yuri Shimaki, Hiroki Senshu, Hirohide Demura, Toru Kouyama, Tomohiko Sekiguchi, Sunao Hasegawa, Makoto Yoshikawa
  • Organizer: JpGU-AGU2020
  • Int'l Joint Research
• [Presentation] Thermophysical Properties of Ryugu Estimated from a Box-A Observation (2020)
  • Author(s): Yuri Shimaki, Hiroki Senshu, Naoya Sakatani, Tatsuaki Okada, Tetsuya Fukuhara, Satoshi Tanaka, Makoto Taguchi, Takehiko Arai, Hirohide Demura, Kentaro Suko, Tomohiko Sekiguchi, Toru Kouyama, Jun Takita, Sunao Hasegawa
  • Organizer: JpGU-AGU2020
  • Int'l Joint Research
• [Presentation] Three-dimensional tracking of various sized glass beads ejected from crater formed by high-velocity impact (2020)
  • Author(s): Hatsune Okawa, Minami Yasui, Masahiko Arakawa, Sunao Hasegawa, Yusaku Yokota, Yuya Yamamoto
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research
• [Presentation] X-ray nanotomograpy analysis of CM chondrites as a rehearsal of Hayabusa 2 sample analysis (2020)
  • Author(s): M. Sun, A. Tsuchiyama, A. Miyake, S. Okumura, M. Matsumoto, T. Nakamura, Y. Fujioka, N. Tomioka, M. Ito, Y. Kodama, N. Imae, A. Yamaguchi, S. Rubino, N. Nakano, J. Matsuno, T. Noguchi, K. Uesugi, A. Takeuchi, M. Yasutake, T. Nakano
  • Organizer: Annual meeting of chinese geoscience union
• [Presentation] YORP Effect on Asteroid Ryugu (2020)
  • Author(s): Masanori Kanamaru, Sho Sasaki, Tomokatsu Morota, Yuichiro Cho, Naru Hirata, Naoyuki Hirata, Hiroki Senshu, Yuri Shimaki, Satoshi Tanaka, Tatsuaki Okada, Tomohiro Usui, Seiji Sugita, Sei-ichiro Watanabe
  • Organizer: JpGU-AGU2020
  • Int'l Joint Research
• [Presentation] クレーター形成時のエジェクタ放出過程におけるサイズごとの三次元粒子追跡 (2020)
  • Author(s): 大川初音, 荒川政彦, 保井みなみ, 長谷川直, 横田優作, 山本裕也
  • Organizer: 日本惑星科学会2020年度秋季講演会
• [Presentation] はやぶさ2SCIによる人工クレーター形成に伴う小惑星リュウグウの再表面化過程 (2020)
  • Author(s): 本田理恵, 荒川政彦ほか
  • Organizer: 日本惑星科学会2020年度秋季講演会
• [Presentation] はやぶさ２のタッチダウンによって明らかとなった小惑星リュウグウの表層の進化 (2020)
  • Author(s): 諸田ほか
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research / Invited
• [Presentation] はやぶさ2のリュウグウ近傍観測の科学成果 (2020)
  • Author(s): 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
  • Organizer: 日本惑星科学会秋季講演会
• [Presentation] はやぶさ２のリュウグウ近傍探査と科学成果 (2020)
  • Author(s): 渡邊誠一郎
  • Organizer: 日本地球化学会年会2020
  • Invited
• [Presentation] ラブルパイル天体に適用可能なクレータースケール則と衝突励起振動に関する実験的研究 (2020)
  • Author(s): 山本裕也、荒川政彦ほか
  • Organizer: 日本惑星科学会2020年度秋季講演会
• [Presentation] 弱い強度を持つ表面への衝突クレーター形成実験とクレータースケール則の構築 (2020)
  • Author(s): 杉村瞭、荒川政彦、保井みなみ、千秋博紀、長谷川直
  • Organizer: JpGU-AGU Joint Meeting 2020
• [Presentation] 小惑星Ryuguに働くYORP効果と自転進化史 (2020)
  • Author(s): 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
  • Organizer: 日本惑星科学会秋季講演会
• [Presentation] 小惑星の起伏地形上に形成するクレーターに関する実験的研究 (2020)
  • Author(s): 横田優作,荒川政彦, 保井みなみ, 山本裕也, 長谷川直, 大川初音
  • Organizer: 日本惑星科学会2020年度秋季講演会
• [Presentation] 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 (2020)
  • Author(s): 渡邊誠一郎
  • Organizer: JpGU-AGU Joint Meeting 2020
  • Int'l Joint Research
• [Presentation] 小惑星リュウグウの科学 (2020)
  • Author(s): 渡邊誠一郎
  • Organizer: 日本天文学会秋季年会
  • Invited
• [Presentation] 小惑星探査機はやぶさ2の低高度運用で観測された小惑星リュウグウに点在する岩塊の温度変化分布解析 (2020)
  • Author(s): 大杉歩, 坂谷尚哉, 嶌生有理, 千秋博紀, 荒井武彦, 出村裕英, 田中智,福原哲哉, 岡田達明
  • Organizer: 日本惑星科学会秋季講演会
• [Presentation] 小惑星探査機はやぶさ2搭載中間赤外カメラTIRのデータアーカイブ (2020)
  • Author(s): 荒井武彦, 岡田達明, 田中智, 福原哲哉, 出村裕英, 坂谷尚哉, 嶌生有理, 千秋博紀, 神山徹, 関口朋彦
  • Organizer: 日本惑星科学会秋季講演会
• [Presentation] Synchrotron radiation-based X-ray computed nanotomography of unheated and experimentally heated Murchison CM chondrite (2020)
  • Author(s): M. Matsumoto, A. Tsuchiyama, M. Yasutake, A. Miyake, K. Uesugi, A. Takeuchi, T. Nakano, T. Nakamura.
  • Organizer: JPGU
• [Presentation] Relationship between visible reflectance at 550 nm and carbon contents in carbonaceous chondrites: At-tempt to estimate the bulk carbon contents of asteroid Ryugu’s surface. (2020)
  • Author(s): H. Yabuta, M. Ikehara, E. Tatsumi, S. Sugita, S. Yamashita, K. Mogi, K. Amano, M. Matsuoka, S. Kobayashi and T. Nakamura
  • Organizer: JPGU
• [Presentation] 非加熱・実験加熱Murchison隕石の放射光X線CT (2020)
  • Author(s): 松本恵, 土`山明, 安武正展, 三宅亮, 上杉健太朗, 竹内晃久,中野司, 中村智樹
  • Organizer: 鉱物学会
• [Presentation] 顕微赤外ロックイン式周期加熱法によるMurray隕石の熱拡散率測定 (2020)
  • Author(s): 河原岳尊、石崎拓也、冨岡孝太、田中智、中村智樹、長野方星
  • Organizer: 熱物性シンポジウム