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

Sakatani, N. (author)
Department of Physics, Rikkyo University, Toshima, Japan
Tanaka, S. (author)
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
Okada, T. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; University of Tokyo, Bunkyo, Japan
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Fukuhara, T. (author)
Department of Physics, Rikkyo University, Toshima, Japan
Riu, L. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Sugita, S. (author)
University of Tokyo, Bunkyo, Japan
Honda, R. (author)
Kochi University, Kochi, Japan
Morota, T. (author)
University of Tokyo, Bunkyo, Japan
Kameda, S. (author)
Department of Physics, Rikkyo University, Toshima, Japan
Yokota, Y. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Tatsumi, E. (author)
University of Tokyo, Bunkyo, Japan; Instituto de Astrofisica de Canarias, University of La Laguna, La Laguna, Spain
Yumoto, K. (author)
University of Tokyo, Bunkyo, Japan
Hirata, N. (author)
University of Aizu, Aizu-Wakamatsu, Japan
Miura, A. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Kouyama, T. (author)
National Institute of Advanced Industrial Science and Technology, Koto, Japan
Senshu, H. (author)
Chiba Institute of Technology, Narashino, Japan
Shimaki, Y. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Arai, T. (author)
Ashikaga University, Ashikaga, Japan
Takita, J. (author)
Hokkaido Kitami Hokuto High School, Kitami, Japan
Demura, H. (author)
University of Aizu, Aizu-Wakamatsu, Japan
Sekiguchi, T. (author)
Hokkaido University of Education, Asahikawa, Japan
Müller, T.G. (author)
Max-Planck Institute for Extraterrestrial Physics, Garching, Germany
Hagermann, Axel (author)
Luleå tekniska universitet,Rymdteknik
Biele, J. (author)
German Aerospace Center (DLR), Cologne, Germany
Grott, M. (author)
German Aerospace Center (DLR), Berlin, Germany
Hamm, M. (author)
German Aerospace Center (DLR), Berlin, Germany; University of Potsdam, Potsdam, Germany
Delbo, M. (author)
Observatoire de la Côte d’Azur, CNRS, Nice, France
Neumann, W. (author)
German Aerospace Center (DLR), Berlin, Germany; Universität Heidelberg, Heidelberg, Germany
Taguchi, M. (author)
Department of Physics, Rikkyo University, Toshima, Japan
Ogawa, Y. (author)
University of Aizu, Aizu-Wakamatsu, Japan
Matsunaga, T. (author)
National Institute for Environmental Studies, Tsukuba, Japan
Wada, T. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Hasegawa, S. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Helbert, J. (author)
German Aerospace Center (DLR), Berlin, Germany
Hirata, N. (author)
Kobe University, Kobe, Japan
Noguchi, R. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Yamada, M. (author)
Chiba Institute of Technology, Narashino, Japan
Suzuki, H. (author)
Meiji University, Kawasaki, Japan
Honda, C. (author)
University of Aizu, Aizu-Wakamatsu, Japan
Ogawa, K. (author)
JAXA Space Exploration Center, Japan Aerospace Exploration Agency, Sagamihara, Japan
Hayakawa, M. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Yoshioka, K. (author)
University of Tokyo, Kashiwa, Japan
Matsuoka, M. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Cho, Y. (author)
University of Tokyo, Bunkyo, Japan
Sawada, H. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Kitazato, K. (author)
University of Aizu, Aizu-Wakamatsu, Japan
Iwata, T. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan
Abe, M. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Ohtake, M. (author)
University of Aizu, Aizu-Wakamatsu, Japan
Matsuura, S. (author)
Kwansei Gakuin University, Hyogo, Japan
Matsumoto, K. (author)
The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan; National Astronomical Observatory of Japan, Mitaka, Japan
Noda, H. (author)
The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan; National Astronomical Observatory of Japan, Mitaka, Japan
Ishihara, Y. (author)
JAXA Space Exploration Center, Japan Aerospace Exploration Agency, Sagamihara, Japan
Yamamoto, K. (author)
National Astronomical Observatory of Japan, Mitaka, Japan
Higuchi, A. (author)
University of Occupational and Environmental Health, Kitakyusyu, Japan
Namiki, N. (author)
The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan; National Astronomical Observatory of Japan, Mitaka, Japan
Ono, G. (author)
Research and Development Directorate, Japan Aerospace Exploration Agency, Sagamihara, Japan
Saiki, T. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Imamura, H. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Takagi, Y. (author)
Aichi Toho University, Nagoya, Japan
Yano, H. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan
Shirai, K. (author)
Kobe University, Kobe, Japan
Okamoto, C. (author)
Kobe University, Kobe, Japan
Nakazawa, S. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Iijima, Y. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Arakawa, M. (author)
Kobe University, Kobe, Japan
Wada, K. (author)
Chiba Institute of Technology, Narashino, Japan
Kadono, T. (author)
University of Occupational and Environmental Health, Kitakyusyu, Japan
Ishibashi, K. (author)
Chiba Institute of Technology, Narashino, Japan
Terui, F. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Kikuchi, S. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Yamaguchi, T. (author)
Mitsubishi Electric Corporation, Kamakura, Japan
Ogawa, N. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Mimasu, Y. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Yoshikawa, K. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Takahashi, T. (author)
NEC Corporation, Fuchu, Japan
Takei, Y. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Fujii, A. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Takeuchi, H. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan
Yamamoto, Y. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Hirose, C. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Hosoda, S. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Mori, O. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Shimada, T. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Soldini, S. (author)
University of Liverpool, Liverpool, UK
Tsukizaki, R. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Ozaki, M. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan
Tachibana, S. (author)
University of Tokyo, Bunkyo, Japan
Ikeda, H. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
Ishiguro, M. (author)
Seoul National University, Seoul, Korea
Yabuta, H. (author)
Hiroshima University, Higashi-hiroshima, Japan
Yoshikawa, M. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan
Watanabe, S. (author)
Nagoya University, Nagoya, Japan
Tsuda, Y. (author)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; The Graduate University for Advanced Studies (SOKENDAI), Hayama, Japan
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 (creator_code:org_t)
2021-05-24
2021
English.
In: Nature Astronomy. - : Springer Nature. - 2397-3366. ; 5:8, s. 766-774
  • Journal article (peer-reviewed)
Abstract Subject headings
Close  
  • 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

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

Atmosfärsvetenskap
Atmospheric Science

Publication and Content Type

ref (subject category)
art (subject category)

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