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

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

Michikami, Tatsuhiro (författare): Faculty of Engineering, Kindai University, Hiroshima Campus, 1 Takaya Umenobe, Higashi-Hiroshima, Hiroshima 739-2116, Japan

Hagermann, Axel (författare): Luleå tekniska universitet,Rymdteknik

Morota, Tomokatsu (författare): Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

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Yokota, Yasuhiro (författare): Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara 252-5210, Japan

Urakawa, Seitaro (författare): Japan Spaceguard Association, Bisei Spaceguard Center 1716-3 Okura, Bisei, Ibara, Okayama 714-1411, Japan

Okamura, Hiroyuki (författare): Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan

Tanabe, Naoya (författare): Japan Aerospace Exploration Agency (JAXA), 7-44-1 Jindaiji Higashi-machi, Chofu-shi, Tokyo 182-8522, Japan

Yumoto, Koki (författare): Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

Ebihara, Tatsuki (författare): Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

Cho, Yuichiro (författare): Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

Ernst, Carolyn M. (författare): The Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, United States

Hayakawa, Masahiko (författare): Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara 252-5210, Japan

Hirabayashi, Masatoshi (författare): Department of Aerospace Engineering, Department of Geosciences, Auburn University, 211 Davis, Auburn, AL 36849, United States

Hirata, Naru (författare): Graduate School of Computer Science and Engineering, University of Aizu, Tsuruga, Ikkimachi, Aizu Wakamatsu, Fukushima 965-8580, Japan

Honda, Chikatoshi (författare): Graduate School of Computer Science and Engineering, University of Aizu, Tsuruga, Ikkimachi, Aizu Wakamatsu, Fukushima 965-8580, Japan

Honda, Rie (författare): Department of Information Science, Kochi University, 2-5-1 Akebono-cho, Kochi, 780-8520, Japan

Kameda, Shingo (författare): Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan

Kanamaru, Masanori (författare): Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara 252-5210, Japan

Kikuchi, Hiroshi (författare): Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara 252-5210, Japan

Kikuchi, Shota (författare): Planetary Exploration Research Center, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino 275-0016, Japan

Kouyama, Toru (författare): Digital Architecture Research Center, National Institute of Advanced Industrial Science and Technology, 2-3-26, Aomi, Koto-ku, Tokyo 135-0064, Japan

Matsuoka, Moe (författare): Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France

Miyamoto, Hideaki (författare): Department of Systems Innovation, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Noguchi, Takaaki (författare): Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University, Kitashirakawaoiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan

Noguchi, Rina (författare): Faculty of Science, Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, Niigata 950-2181, Japan; Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara 252-5210, Japan

Ogawa, Kazunori (författare): Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara 252-5210, Japan

Okada, Tatsuaki (författare): Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara 252-5210, Japan

Sakatani, Naoya (författare): Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan

Sasaki, Sho (författare): Department of Earth and Space Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka 560-0043, Japan

Sawada, Hirotaka (författare): Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara 252-5210, Japan

Sugimoto, Chiho (författare): Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

Suzuki, Hidehiko (författare): Department of Physics, Meiji University, Kawasaki, 1-1-1 Higashimita, Tama-ku, Kawasaki 214-8571, Japan

Tanaka, Satoshi (författare): Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara 252-5210, Japan

Tatsumi, Eri (författare): Instituto de Astrofisica de Canarias, Calle Vía Láctea, s/n, 38205 San Cristóbal de La Laguna, Santa Cruz de Tenerife, Spain; Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

Tsuchiyama, Akira (författare): Research Organization of Science and Technology, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan; CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (CAS), 511 Kehua Street, Wushan, Tianhe District, Guangzhou 510640, China; CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China

Tsuda, Yuichi (författare): Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara 252-5210, Japan

Watanabe, Sei-ichiro (författare): Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan

Yamada, Manabu (författare): Planetary Exploration Research Center, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino 275-0016, Japan

Yoshikawa, Makoto (författare): Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara 252-5210, Japan

Yoshioka, Kazuo (författare): Department of Complexity Science and Engineering, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

Sugita, Seiji (författare): Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; Planetary Exploration Research Center, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino 275-0016, Japan; Department of Complexity Science and Engineering, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan; Research Center for the Early Universe, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

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Elsevier, 2022
2022
Engelska.
Ingår i: Icarus. - : Elsevier. - 0019-1035 .- 1090-2643. ; 381

Relaterad länk:: https://doi.org/10.1...; visa fler...; https://urn.kb.se/re...; https://doi.org/10.1...; visa färre...

Tidskriftsartikel (refereegranskat)

Abstract Ämnesord

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Over a broad size range, the shapes of impact fragments from catastrophic disruptions are distributed around the mean axial ratio 2: √2: 1, irrespective of experimental conditions and target materials. Although most blocks on asteroids are likely to be impact fragments, there is not enough quantitative data for reliable statistics on their three-axial lengths and/or ratios because it is difficult to precisely estimate the heights of the blocks. In this study, we evaluate the heights of blocks on asteroid Ryugu by measuring their shadows. The three-axial ratios of ~4100 small blocks with diameters from 5.0 cm to 7.6 m in Ryugu's equatorial region are investigated using eight close-up images of narrower localities taken at altitudes below 500 m, i.e. at <5.4 cm/pixel resolution, obtained immediately before the second touch-down of the Hayabusa2 spacecraft. The purpose of this study is to investigate the block shape distribution, which is important for understanding the geological history of asteroid Ryugu. Specifically, the shape distribution is compared to laboratory impact fragments. Our observations indicate that the shape distributions of blocks smaller than 1 m on Ryugu are consistent with laboratory impact fragment shape distributions, implying that the dominant shape-determining process for blocks on Ryugu was impact fragmentation. Blocks several meters in size in the equatorial region seem to be slightly flatter than the rest, suggesting that some blocks are partly buried in a bed of regolith. In conclusion, the shape distributions of blocks from several-cm to several-m in the equatorial region of asteroid Ryugu suggest that these are mainly fragments originating from the catastrophic disruption of their parent body and/or from a later impact.

Ämnesord

NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)

Nyckelord

Asteroids
Surfaces
Impact process
Asteroid Ryugu
Regolith
Atmosfärsvetenskap
Atmospheric science

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