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- Sakatani, N.Department of Physics, Rikkyo University, Toshima, Japan (author)
Anomalously porous boulders on (162173) Ryugu as primordial materials from its parent body
- Article/chapterEnglish2021
Publisher, publication year, extent ...
- 2021-05-24
- Springer Nature,2021
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:ltu-85047
- https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-85047URI
- https://doi.org/10.1038/s41550-021-01371-7DOI
Supplementary language notes
- Language:English
- Summary in:English
Part of subdatabase
- SwePubSwePub
Classification
Notes
- Validerad;2021;Nivå 2;2021-08-17 (johcin)
- Planetesimals—the initial stage of the planetary formation process—are considered to be initially very porous aggregates of dusts1,2, and subsequent thermal and compaction processes reduce their porosity3. The Hayabusa2 spacecraft found that boulders on the surface of asteroid (162173) Ryugu have an average porosity of 30–50% (refs. 4,5,6), higher than meteorites but lower than cometary nuclei7, which are considered to be remnants of the original planetesimals8. 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 average6 and porosity >70%, which is as high as in cometary bodies. The artificial crater formed by Hayabusa2’s impact experiment9 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 compaction3. 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 operations10,11.
Subject headings and genre
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- Atmosfärsvetenskap
- Atmospheric Science
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- Tanaka, S.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan; University of Tokyo, Kashiwa, Japan (author)
- Okada, T.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; University of Tokyo, Bunkyo, Japan (author)
- Fukuhara, T.Department of Physics, Rikkyo University, Toshima, Japan (author)
- Riu, L.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Sugita, S.University of Tokyo, Bunkyo, Japan (author)
- Honda, R.Kochi University, Kochi, Japan (author)
- Morota, T.University of Tokyo, Bunkyo, Japan (author)
- Kameda, S.Department of Physics, Rikkyo University, Toshima, Japan (author)
- Yokota, Y.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Tatsumi, E.University of Tokyo, Bunkyo, Japan; Instituto de Astrofisica de Canarias, University of La Laguna, La Laguna, Spain (author)
- Yumoto, K.University of Tokyo, Bunkyo, Japan (author)
- Hirata, N.University of Aizu, Aizu-Wakamatsu, Japan (author)
- Miura, A.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Kouyama, T.National Institute of Advanced Industrial Science and Technology, Koto, Japan (author)
- Senshu, H.Chiba Institute of Technology, Narashino, Japan (author)
- Shimaki, Y.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Arai, T.Ashikaga University, Ashikaga, Japan (author)
- Takita, J.Hokkaido Kitami Hokuto High School, Kitami, Japan (author)
- Demura, H.University of Aizu, Aizu-Wakamatsu, Japan (author)
- Sekiguchi, T.Hokkaido University of Education, Asahikawa, Japan (author)
- Müller, T.G.Max-Planck Institute for Extraterrestrial Physics, Garching, Germany (author)
- Hagermann, AxelLuleå tekniska universitet,Rymdteknik(Swepub:ltu)axehag (author)
- Biele, J.German Aerospace Center (DLR), Cologne, Germany (author)
- Grott, M.German Aerospace Center (DLR), Berlin, Germany (author)
- Hamm, M.German Aerospace Center (DLR), Berlin, Germany; University of Potsdam, Potsdam, Germany (author)
- Delbo, M.Observatoire de la Côte d’Azur, CNRS, Nice, France (author)
- Neumann, W.German Aerospace Center (DLR), Berlin, Germany; Universität Heidelberg, Heidelberg, Germany (author)
- Taguchi, M.Department of Physics, Rikkyo University, Toshima, Japan (author)
- Ogawa, Y.University of Aizu, Aizu-Wakamatsu, Japan (author)
- Matsunaga, T.National Institute for Environmental Studies, Tsukuba, Japan (author)
- Wada, T.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Hasegawa, S.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Helbert, J.German Aerospace Center (DLR), Berlin, Germany (author)
- Hirata, N.Kobe University, Kobe, Japan (author)
- Noguchi, R.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Yamada, M.Chiba Institute of Technology, Narashino, Japan (author)
- Suzuki, H.Meiji University, Kawasaki, Japan (author)
- Honda, C.University of Aizu, Aizu-Wakamatsu, Japan (author)
- Ogawa, K.JAXA Space Exploration Center, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Hayakawa, M.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Yoshioka, K.University of Tokyo, Kashiwa, Japan (author)
- Matsuoka, M.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Cho, Y.University of Tokyo, Bunkyo, Japan (author)
- Sawada, H.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Kitazato, K.University of Aizu, Aizu-Wakamatsu, Japan (author)
- Iwata, T.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan (author)
- Abe, M.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Ohtake, M.University of Aizu, Aizu-Wakamatsu, Japan (author)
- Matsuura, S.Kwansei Gakuin University, Hyogo, Japan (author)
- Matsumoto, K.The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan; National Astronomical Observatory of Japan, Mitaka, Japan (author)
- Noda, H.The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan; National Astronomical Observatory of Japan, Mitaka, Japan (author)
- Ishihara, Y.JAXA Space Exploration Center, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Yamamoto, K.National Astronomical Observatory of Japan, Mitaka, Japan (author)
- Higuchi, A.University of Occupational and Environmental Health, Kitakyusyu, Japan (author)
- Namiki, N.The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan; National Astronomical Observatory of Japan, Mitaka, Japan (author)
- Ono, G.Research and Development Directorate, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Saiki, T.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Imamura, H.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Takagi, Y.Aichi Toho University, Nagoya, Japan (author)
- Yano, H.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan (author)
- Shirai, K.Kobe University, Kobe, Japan (author)
- Okamoto, C.Kobe University, Kobe, Japan (author)
- Nakazawa, S.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Iijima, Y.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Arakawa, M.Kobe University, Kobe, Japan (author)
- Wada, K.Chiba Institute of Technology, Narashino, Japan (author)
- Kadono, T.University of Occupational and Environmental Health, Kitakyusyu, Japan (author)
- Ishibashi, K.Chiba Institute of Technology, Narashino, Japan (author)
- Terui, F.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Kikuchi, S.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Yamaguchi, T.Mitsubishi Electric Corporation, Kamakura, Japan (author)
- Ogawa, N.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Mimasu, Y.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Yoshikawa, K.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Takahashi, T.NEC Corporation, Fuchu, Japan (author)
- Takei, Y.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Fujii, A.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Takeuchi, H.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan (author)
- Yamamoto, Y.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Hirose, C.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Hosoda, S.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Mori, O.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Shimada, T.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Soldini, S.University of Liverpool, Liverpool, UK (author)
- Tsukizaki, R.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Ozaki, M.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan (author)
- Tachibana, S.University of Tokyo, Bunkyo, Japan (author)
- Ikeda, H.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan (author)
- Ishiguro, M.Seoul National University, Seoul, Korea (author)
- Yabuta, H.Hiroshima University, Higashi-hiroshima, Japan (author)
- Yoshikawa, M.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan (author)
- Watanabe, S.Nagoya University, Nagoya, Japan (author)
- Tsuda, Y.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan (author)
- Department of Physics, Rikkyo University, Toshima, JapanInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan; University of Tokyo, Kashiwa, Japan (creator_code:org_t)
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- In:Nature Astronomy: Springer Nature5:8, s. 766-7742397-3366
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- Honda, R.
- Morota, T.
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- Miura, A.
- Kouyama, T.
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- Shimaki, Y.
- Arai, T.
- Takita, J.
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- Sekiguchi, T.
- Müller, T.G.
- Hagermann, Axel
- Biele, J.
- Grott, M.
- Hamm, M.
- Delbo, M.
- Neumann, W.
- Taguchi, M.
- Ogawa, Y.
- Matsunaga, T.
- Wada, T.
- Hasegawa, S.
- Helbert, J.
- Noguchi, R.
- Yamada, M.
- Suzuki, H.
- Honda, C.
- Ogawa, K.
- Hayakawa, M.
- Yoshioka, K.
- Matsuoka, M.
- Cho, Y.
- Sawada, H.
- Kitazato, K.
- Iwata, T.
- Abe, M.
- Ohtake, M.
- Matsuura, S.
- Matsumoto, K.
- Noda, H.
- Ishihara, Y.
- Yamamoto, K.
- Higuchi, A.
- Namiki, N.
- Ono, G.
- Saiki, T.
- Imamura, H.
- Takagi, Y.
- Yano, H.
- Shirai, K.
- Okamoto, C.
- Nakazawa, S.
- Iijima, Y.
- Arakawa, M.
- Wada, K.
- Kadono, T.
- Ishibashi, K.
- Terui, F.
- Kikuchi, S.
- Yamaguchi, T.
- Ogawa, N.
- Mimasu, Y.
- Yoshikawa, K.
- Takahashi, T.
- Takei, Y.
- Fujii, A.
- Takeuchi, H.
- Yamamoto, Y.
- Hirose, C.
- Hosoda, S.
- Mori, O.
- Shimada, T.
- Soldini, S.
- Tsukizaki, R.
- Ozaki, M.
- Tachibana, S.
- Ikeda, H.
- Ishiguro, M.
- Yabuta, H.
- Yoshikawa, M.
- Watanabe, S.
- Tsuda, Y.
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