論文

査読有り
2020年5月8日

Sample collection from asteroid (162173) Ryugu by Hayabusa2: Implications for surface evolution

Science
  • T. Morota
  • ,
  • S. Sugita
  • ,
  • Y. Cho
  • ,
  • M. Kanamaru
  • ,
  • E. Tatsumi
  • ,
  • N. Sakatani
  • ,
  • R. Honda
  • ,
  • N. Hirata
  • ,
  • H. Kikuchi
  • ,
  • M. Yamada
  • ,
  • Y. Yokota
  • ,
  • S. Kameda
  • ,
  • M. Matsuoka
  • ,
  • H. Sawada
  • ,
  • C. Honda
  • ,
  • T. Kouyama
  • ,
  • K. Ogawa
  • ,
  • H. Suzuki
  • ,
  • K. Yoshioka
  • ,
  • M. Hayakawa
  • ,
  • N. Hirata
  • ,
  • M. Hirabayashi
  • ,
  • H. Miyamoto
  • ,
  • T. Michikami
  • ,
  • T. Hiroi
  • ,
  • R. Hemmi
  • ,
  • O. S. Barnouin
  • ,
  • C. M. Ernst
  • ,
  • K. Kitazato
  • ,
  • T. Nakamura
  • ,
  • L. Riu
  • ,
  • H. Senshu
  • ,
  • H. Kobayashi
  • ,
  • S. Sasaki
  • ,
  • G. Komatsu
  • ,
  • N. Tanabe
  • ,
  • Y. Fujii
  • ,
  • T. Irie
  • ,
  • M. Suemitsu
  • ,
  • N. Takaki
  • ,
  • C. Sugimoto
  • ,
  • K. Yumoto
  • ,
  • M. Ishida
  • ,
  • H. Kato
  • ,
  • K. Moroi
  • ,
  • D. Domingue
  • ,
  • P. Michel
  • ,
  • C. Pilorget
  • ,
  • T. Iwata
  • ,
  • M. Abe
  • ,
  • M. Ohtake
  • ,
  • Y. Nakauchi
  • ,
  • K. Tsumura
  • ,
  • H. Yabuta
  • ,
  • Y. Ishihara
  • ,
  • R. Noguchi
  • ,
  • K. Matsumoto
  • ,
  • A. Miura
  • ,
  • N. Namiki
  • ,
  • S. Tachibana
  • ,
  • M. Arakawa
  • ,
  • H. Ikeda
  • ,
  • K. Wada
  • ,
  • T. Mizuno
  • ,
  • C. Hirose
  • ,
  • S. Hosoda
  • ,
  • O. Mori
  • ,
  • T. Shimada
  • ,
  • S. Soldini
  • ,
  • R. Tsukizaki
  • ,
  • H. Yano
  • ,
  • M. Ozaki
  • ,
  • H. Takeuchi
  • ,
  • Y. Yamamoto
  • ,
  • T. Okada
  • ,
  • Y. Shimaki
  • ,
  • K. Shirai
  • ,
  • Y. Iijima
  • ,
  • H. Noda
  • ,
  • S. Kikuchi
  • ,
  • T. Yamaguchi
  • ,
  • N. Ogawa
  • ,
  • G. Ono
  • ,
  • Y. Mimasu
  • ,
  • K. Yoshikawa
  • ,
  • T. Takahashi
  • ,
  • Y. Takei
  • ,
  • A. Fujii
  • ,
  • S. Nakazawa
  • ,
  • F. Terui
  • ,
  • S. Tanaka
  • ,
  • M. Yoshikawa
  • ,
  • T. Saiki
  • ,
  • S. Watanabe
  • ,
  • Y. Tsuda

368
6491
開始ページ
654
終了ページ
659
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1126/science.aaz6306
出版者・発行元
American Association for the Advancement of Science (AAAS)

The near-Earth asteroid (162173) Ryugu is thought to be a primitive carbonaceous object that contains hydrated minerals and organic molecules. We report sample collection from Ryugu’s surface by the Hayabusa2 spacecraft on 21 February 2019. Touchdown images and global observations of surface colors are used to investigate the stratigraphy of the surface around the sample location and across Ryugu. Latitudinal color variations suggest the reddening of exposed surface material by solar heating and/or space weathering. Immediately after touchdown, Hayabusa2’s thrusters disturbed dark, fine grains that originate from the redder materials. The stratigraphic relationship between identified craters and the redder material indicates that surface reddening occurred over a short period of time. We suggest that Ryugu previously experienced an orbital excursion near the Sun.

リンク情報
DOI
https://doi.org/10.1126/science.aaz6306
URL
https://syndication.highwire.org/content/doi/10.1126/science.aaz6306

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