On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective

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  • NAKAMURA Eizo
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • KOBAYASHI Katsura
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • TANAKA Ryoji
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • KUNIHIRO Tak
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • KITAGAWA Hiroshi
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • POTISZIL Christian
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • OTA Tsutomu
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • SAKAGUCHI Chie
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • YAMANAKA Masahiro
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • RATNAYAKE Dilan M.
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • TRIPATHI Havishk
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • KUMAR Rahul
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • AVRAMESCU Maya-Liliana
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • TSUCHIDA Hidehisa
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • YACHI Yusuke
    The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University
  • MIURA Hitoshi
    Department of Information and Basic Science, Nagoya City University
  • ABE Masanao
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency The Graduate University for Advanced Studies (SOKENDAI)
  • FUKAI Ryota
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • FURUYA Shizuho
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency Graduate School of Science, The University of Tokyo
  • HATAKEDA Kentaro
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • HAYASHI Tasuku
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • HITOMI Yuya
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency Marine Works Japan, Ltd.
  • KUMAGAI Kazuya
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency Marine Works Japan, Ltd.
  • MIYAZAKI Akiko
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • NAKATO Aiko
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • NISHIMURA Masahiro
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • OKADA Tatsuaki
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency Graduate School of Science, The University of Tokyo
  • SOEJIMA Hiromichi
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency Marine Works Japan, Ltd.
  • SUGITA Seiji
    Graduate School of Science, The University of Tokyo Planetary Exploration Research Center (PERC), Chiba Institute of Technology
  • SUZUKI Ayako
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency Marine Works Japan, Ltd.
  • USUI Tomohiro
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • YADA Toru
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • YAMAMOTO Daiki
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • YOGATA Kasumi
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • YOSHITAKE Miwa
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • ARAKAWA Masahiko
    Graduate School of Science, Kobe University
  • FUJII Atsushi
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • HAYAKAWA Masahiko
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • HIRATA Naoyuki
    Graduate School of Science, Kobe University
  • HIRATA Naru
    Faculty of Computer Science and Engineering, The University of Aizu
  • HONDA Rie
    Faculty of Science and Technology, Kochi University
  • HONDA Chikatoshi
    Faculty of Computer Science and Engineering, The University of Aizu
  • HOSODA Satoshi
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • IIJIMA Yu-ichi
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • IKEDA Hitoshi
    Research and Development Directorate, JAXA
  • ISHIGURO Masateru
    Department of Physics and Astronomy, Seoul National University
  • ISHIHARA Yoshiaki
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • IWATA Takahiro
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency The Graduate University for Advanced Studies (SOKENDAI)
  • KAWAHARA Kosuke
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • KIKUCHI Shota
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency Planetary Exploration Research Center (PERC), Chiba Institute of Technology
  • KITAZATO Kohei
    Faculty of Computer Science and Engineering, The University of Aizu
  • MATSUMOTO Koji
    National Astronomical Observatory of Japan
  • MATSUOKA Moe
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency Observatoire de Paris
  • MICHIKAMI Tatsuhiro
    Faculty of Engineering, Kindai University
  • MIMASU Yuya
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • MIURA Akira
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • MOROTA Tomokatsu
    Graduate School of Environmental Studies, Nagoya University
  • NAKAZAWA Satoru
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • NAMIKI Noriyuki
    National Astronomical Observatory of Japan
  • NODA Hirotomo
    National Astronomical Observatory of Japan
  • NOGUCHI Rina
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency Faculty of Science, Niigata University
  • OGAWA Naoko
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency JAXA Space Exploration Center, Japan Aerospace Exploration Agency
  • OGAWA Kazunori
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • OKAMOTO Chisato
    Graduate School of Science, Kobe University
  • ONO Go
    Research and Development Directorate, JAXA
  • OZAKI Masanobu
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • SAIKI Takanao
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • SAKATANI Naoya
    College of Science, Rikkyo University
  • SAWADA Hirotaka
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • SENSHU Hiroki
    Planetary Exploration Research Center (PERC), Chiba Institute of Technology
  • SHIMAKI Yuri
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • SHIRAI Kei
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency Graduate School of Science, Kobe University
  • TAKEI Yuto
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • TAKEUCHI Hiroshi
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • TANAKA Satoshi
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency The Graduate University for Advanced Studies (SOKENDAI) The University of Tokyo
  • TATSUMI Eri
    Graduate School of Science, The University of Tokyo Instituto de Astrofisica de Canarias, University of La Laguna
  • TERUI Fuyuto
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency Faculty of Engineering, Kanagawa Institute of Technology
  • TSUKIZAKI Ryudo
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • WADA Koji
    Planetary Exploration Research Center (PERC), Chiba Institute of Technology
  • YAMADA Manabu
    Planetary Exploration Research Center (PERC), Chiba Institute of Technology
  • YAMADA Tetsuya
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • YAMAMOTO Yukio
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • YANO Hajime
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • YOKOTA Yasuhiro
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • YOSHIHARA Keisuke
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • YOSHIKAWA Makoto
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency The Graduate University for Advanced Studies (SOKENDAI)
  • YOSHIKAWA Kent
    Research and Development Directorate, JAXA
  • FUJIMOTO Masaki
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • WATANABE Sei-ichiro
    Graduate School of Environmental Studies, Nagoya University
  • TSUDA Yuichi
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency Graduate School of Science, The University of Tokyo

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<p>Presented here are the observations and interpretations from a comprehensive analysis of 16 representative particles returned from the C-type asteroid Ryugu by the Hayabusa2 mission. On average Ryugu particles consist of 50% phyllosilicate matrix, 41% porosity and 9% minor phases, including organic matter. The abundances of 70 elements from the particles are in close agreement with those of CI chondrites. Bulk Ryugu particles show higher δ18O, Δ17O, and ε54Cr values than CI chondrites. As such, Ryugu sampled the most primitive and least-thermally processed protosolar nebula reservoirs. Such a finding is consistent with multi-scale H-C-N isotopic compositions that are compatible with an origin for Ryugu organic matter within both the protosolar nebula and the interstellar medium. The analytical data obtained here, suggests that complex soluble organic matter formed during aqueous alteration on the Ryugu progenitor planetesimal (several 10’s of km), <2.6 Myr after CAI formation. Subsequently, the Ryugu progenitor planetesimal was fragmented and evolved into the current asteroid Ryugu through sublimation.</p>

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