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Anomalously porous boulders on (162173) Ryugu as primordial materials from its parent body

Sakatani, N. and Tanaka, S. and Okada, T. and Fukuhara, T. and Riu, L. and Sugita, S. and Honda, R. and Morota, T. and Kameda, S. and Yokota, S. and Tatsumi, E. and Yumuto, K. and Hirata, N. and Miura, A. and Kouyama, T. and Senshu, H. and Shimaki, Y. and Arai, T. and Takita, J. and Demura, H. and Sekiguchi, T. and Müller, T. G. and Hagermann, A. and Biele, Jens and Grott, Matthias and Hamm, Maximilian and Neumann, Wladimir and Taguchi, M. and Ogawa, Y. and Matsunaga, T. and Wada, T. and Hasegawa, S. and Helbert, Jörn and Hirata, N. and Noguchi, Rina and Yamada, M. and Suzuki, H. and Honda, C. and Ogawa, Naoko and Hayakawa, M. and Yoshioka, K. and Matsuoka, M. and Cho, Y. and Sawada, H. and Kitazato, K. and Iwata, T. and Abe, M. and Ohtake, M. and Matsuura, Shuji and Matsumoto, K. and Noda, H. and Ishihara, Y. and Yamamoto, K. and Higuchi, A. and Namiki, N. and Ono, G. and Saiki, T. and Imamura, T. and Takagi, Y. and Yano, H. and Shirai, K. and Okamoto, C. and Nakazawa, Satoru and Iijima, Y. and Arakawa, M. and Wada, Koji and Kadono, T. and Ishibashi, K. and Terui, Fuyuto and Kikuchi, Shota and Yamaguchi, T. and Ogawa, Naoko and Mimasu, Y. and Yoshikawa, Kent and Takahashi, T. and Takei, Y. and Fujii, Atsushi and Takeuchi, Hiroshi and Yamamoto, Y. and Hirose, Chikako and Hosoda, Satoshi and Mori, O. and Shimada, Takanobu and Soldini, S. and Tsukizaki, Ryudo and Ozaki, M. and Tachibana, S. and Ikeda, Hitoshi and Ishiguro, Masateru and Yabuta, K. and Yoshikawa, M. and Watanabe, S. and Tsuda, Yuichi (2021) Anomalously porous boulders on (162173) Ryugu as primordial materials from its parent body. Nature Astronomy. Nature Publishing Group. doi: 10.1038/s41550-021-01371-7. ISSN 2397-3366.

Full text not available from this repository.

Official URL: https://www.nature.com/articles/s41550-021-01371-7

Abstract

Planetesimals – the initial stage of the planetary formation process – are considered to be initially very porous aggregates of dusts, and subsequent thermal and compaction processes reduce their porosity. The Hayabusa2 spacecraft found that boulders on the surface of asteroid (162173) Ryugu have an average porosity of 30-50%, higher than meteorites but lower than cometary nuclei, which are considered to be remnants of the original planetesimals. 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 average and porosity >70%, which is as high as in cometary bodies. The artificial crater formed by Hayabusa2’s impact experiment 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 compaction. 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 operations.

Item URL in elib:https://elib.dlr.de/142411/
Document Type:Article
Title:Anomalously porous boulders on (162173) Ryugu as primordial materials from its parent body
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Sakatani, N.Ikkyo University Toshima, Dep. of PhysicsUNSPECIFIED
Tanaka, S.Institute of Space and Astronautical Science , Japan Aerospace Exploration Agency (ISAS / JAXA) ( 3 - 1 - 1 Yoshinodai, Chuo - Ku, Sa gamihara 2 52 - 5210 , JapanUNSPECIFIED
Okada, T.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA) Sagamihara, JapanUNSPECIFIED
Fukuhara, T.hokkaido university, sapporo, japanUNSPECIFIED
Riu, L.Japan Aerospace Exploaration Agency, Ins. of Space and Astronautical ScienceUNSPECIFIED
Sugita, S.University of Tokyo, Tokyo, JapanUNSPECIFIED
Honda, R.Kochi University, JapanUNSPECIFIED
Morota, T.University of Tokyo, Tokyo, JapanUNSPECIFIED
Kameda, S.Rikkyo University, JapanUNSPECIFIED
Yokota, S.ISAS/JAXAUNSPECIFIED
Tatsumi, E.The University of Tokyo, Tokyo 113-0033, JapanUNSPECIFIED
Yumuto, K.University of Tokyo, BunkyoUNSPECIFIED
Hirata, N.Univ Aizu, Res Ctr Adv Informat Sci & Technol, Aizu Wakamatsu, Fukushima, JapanUNSPECIFIED
Miura, A.JAXA-ISAS, Sagamihara, JapanUNSPECIFIED
Kouyama, T.National Institute of Advanced Industrial Science and Technology, Tokyo, JapanUNSPECIFIED
Senshu, H.Chiba Institute of Technology, JapanUNSPECIFIED
Shimaki, Y.JAXA-ISAS, Sagamihara, JapanUNSPECIFIED
Arai, T.Ashikaga University, JapanUNSPECIFIED
Takita, J.Hokkaido Kitami Hokuto High School, JapanUNSPECIFIED
Demura, H.University of Aizu, JapanUNSPECIFIED
Sekiguchi, T.Hokkaido University of Education, Asahikawa, JapanUNSPECIFIED
Müller, T. G.MPE, GarchingUNSPECIFIED
Hagermann, A.Lulea University of Technology, KirunaUNSPECIFIED
Biele, JensJens.Biele (at) dlr.deUNSPECIFIED
Grott, MatthiasMatthias.Grott (at) dlr.deUNSPECIFIED
Hamm, Maximilianmaximilian.hamm (at) dlr.deUNSPECIFIED
Neumann, WladimirWladimir.Neumann (at) dlr.deUNSPECIFIED
Taguchi, M.Rikkyo University, Tokyo, JapanUNSPECIFIED
Ogawa, Y.Univ Aizu, Res Ctr Adv Informat Sci & Technol, Aizu Wakamatsu, Fukushima, JapanUNSPECIFIED
Matsunaga, T.National Institute for Environmental Studies, TsukabaUNSPECIFIED
Wada, T.jaxa-isas, sagamihara, japanUNSPECIFIED
Hasegawa, S.jaxa-isas, sagamihara, japanUNSPECIFIED
Helbert, JörnJoern.Helbert (at) dlr.dehttps://orcid.org/0000-0001-5346-9505
Hirata, N.Kobe University, Kobe 657-8501, JapanUNSPECIFIED
Noguchi, Rinaisas/jaxa japanUNSPECIFIED
Yamada, M.Chiba University, JapanUNSPECIFIED
Suzuki, H.Meiji University, JapanUNSPECIFIED
Honda, C.Univ Aizu, Res Ctr Adv Informat Sci & Technol, Aizu Wakamatsu, Fukushima, JapanUNSPECIFIED
Ogawa, Naokoisas/jaxa japanUNSPECIFIED
Hayakawa, M.ISAS, JAXA, JapanUNSPECIFIED
Yoshioka, K.University of Tokyo, JapanUNSPECIFIED
Matsuoka, M.ISAS, JAXA, JapanUNSPECIFIED
Cho, Y.University of Tokyo, JapanUNSPECIFIED
Sawada, H.ISAS, JAXA, JapanUNSPECIFIED
Kitazato, K.University of AizuUNSPECIFIED
Iwata, T.ISAS/JAXAUNSPECIFIED
Abe, M.ISAS/JAXAUNSPECIFIED
Ohtake, M.Kobe UniversityUNSPECIFIED
Matsuura, ShujiKwansei Gakuin University, Hyogo, JapanUNSPECIFIED
Matsumoto, K.The Graduate University for Advanced StudiesUNSPECIFIED
Noda, H.The Graduate University for Advanced StudiesUNSPECIFIED
Ishihara, Y.YAXA Space Exploration CenterUNSPECIFIED
Yamamoto, K.National Astronomical Observatory of Japan, JapanUNSPECIFIED
Higuchi, A.University of Occupational and Environemntal Healh, KitakuyusyuUNSPECIFIED
Namiki, N.The Graduate University for Advanced StudiesUNSPECIFIED
Ono, G.Research and Development Directorate, JAXA, Sagamihara 252-5210, JapanUNSPECIFIED
Saiki, T.ISAS/JAXA JapanUNSPECIFIED
Imamura, T.ISAS/JAXA JapanUNSPECIFIED
Takagi, Y.Aichi Toho University, Nagoya, JapanUNSPECIFIED
Yano, H.ISAS/JAXA, japanUNSPECIFIED
Shirai, K.Kobe University, JapanUNSPECIFIED
Okamoto, C.Kobe University JapanUNSPECIFIED
Nakazawa, Satoruisas/jaxa japanUNSPECIFIED
Iijima, Y.ISAS/JAXA, JapanUNSPECIFIED
Arakawa, M.Kobe University, KobeUNSPECIFIED
Wada, KojiChiba Institute of TechnologyUNSPECIFIED
Kadono, T.University of Occupational and Environmental Health, Kitakyusu, JapanUNSPECIFIED
Ishibashi, K.NEC Corporation Fuchu, JapanUNSPECIFIED
Terui, Fuyutoisas/jaxa japanUNSPECIFIED
Kikuchi, Shotaisas/jaxa japanUNSPECIFIED
Yamaguchi, T.Mitsubishi Electric Corporation, Kamakura, JapanUNSPECIFIED
Ogawa, Naokoisas/jaxa japanUNSPECIFIED
Mimasu, Y.ISAS/JAXA JapanUNSPECIFIED
Yoshikawa, Kentisas/jaxa japanUNSPECIFIED
Takahashi, T.NEC Corporation, Fuchu, JapanUNSPECIFIED
Takei, Y.ISAS/JAXA JapanUNSPECIFIED
Fujii, Atsushiisas/jaxa japanUNSPECIFIED
Takeuchi, Hiroshiisas/jaxa japanUNSPECIFIED
Yamamoto, Y.isas/jaxa japanUNSPECIFIED
Hirose, Chikakoisas/jaxa japanUNSPECIFIED
Hosoda, Satoshiisas/jaxa japanUNSPECIFIED
Mori, O.ISAS/JAXA JapanUNSPECIFIED
Shimada, Takanobuisas/jaxa japanUNSPECIFIED
Soldini, S.University of LiverpoolUNSPECIFIED
Tsukizaki, Ryudoisas/jaxa japanUNSPECIFIED
Ozaki, M.ISAS/JAXA, JapanUNSPECIFIED
Tachibana, S.University of Tokyo, Bunkyo JapanUNSPECIFIED
Ikeda, Hitoshiisas/jaxa japanUNSPECIFIED
Ishiguro, MasateruSeoul National UniversityUNSPECIFIED
Yabuta, K.Hiroshima UniversityUNSPECIFIED
Yoshikawa, M.isas/jaxa japanUNSPECIFIED
Watanabe, S.Nagoya University, JapanUNSPECIFIED
Tsuda, Yuichiisas/jaxa, japanUNSPECIFIED
Date:24 May 2021
Journal or Publication Title:Nature Astronomy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1038/s41550-021-01371-7
Publisher:Nature Publishing Group
ISSN:2397-3366
Status:Published
Keywords:Ryugu, Planetesimals
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project MASCOT - Science
Location: Berlin-Adlershof , Köln-Porz
Institutes and Institutions:Space Operations and Astronaut Training > User center for space experiments (MUSC)
Institute of Planetary Research > Planetary Physics
Institute of Planetary Research > Planetary Laboratories
Deposited By: Herrmann, Astrid
Deposited On:26 May 2021 11:32
Last Modified:26 May 2021 11:32

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