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Exploring hydrated minerals on asteroids --- AKARI near-infrared asteroid spectroscopic survey

Research Project

Project/Area Number 17K05636
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Solid earth and planetary physics
Research InstitutionKobe University

Principal Investigator

Usui Fumihiko  神戸大学, 理学研究科, 特命助教 (30720669)

Co-Investigator(Kenkyū-buntansha) 長谷川 直  国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 主任研究開発員 (10399553)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords小惑星 / 含水鉱物 / 近赤外線分光観測 / 水・含水鉱物
Outline of Final Research Achievements

Using the Japanese infrared satellite AKARI, we have detected the existence of water in the form of hydrated minerals in a number of asteroids for the first time. AKARI had the capability to obtain spectra at near-infrared wavelengths from 2 to 5 micron. Using this unique function, the spectroscopic observations of 66 asteroids were carried out. This provides the first opportunity to study the features of hydrated minerals in asteroids at around the wavelength of 2.7 micron. The observations detected absorption for 17 C-type asteroids. C-type asteroids, which appear dark at visible wavelengths, were believed to be rich in water and organic material, but the present observations with AKARI are the first to directly confirm the presence of hydrated minerals in these asteroids.
This discovery will contribute to our understanding of the distribution of water in our solar system, the evolution of asteroids, and the origin of water on Earth.

Academic Significance and Societal Importance of the Research Achievements

小惑星には含水鉱物として水が存在しているが、これを検出できる近赤外線の波長帯は地球大気の影響により地上の天文台からは観測できなかった。赤外線天文衛星「あかり」による観測で、数多くの小惑星について含水鉱物の存在を世界で初めて検出した。
「はやぶさ2」などの小惑星探査機と望遠鏡による天文観測は相補的であり、望遠鏡による多数の天体の網羅的な観測によって、探査機が詳しく調べた天体が一般的なのか例外的なのかという太陽系の中での位置付けを示すことができる。これにより、小惑星の起源と進化だけでなく、地球の水や生命の起源への理解も進むと期待される。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (36 results)

All 2020 2019 2018 2017 Other

All Int'l Joint Research (2 results) Journal Article (8 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 8 results,  Open Access: 2 results) Presentation (24 results) (of which Int'l Joint Research: 16 results,  Invited: 1 results) Remarks (2 results)

  • [Int'l Joint Research] Universite Grenoble Alpes(フランス)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Aix-Marseille University(フランス)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Style and intensity of hydration among C-complex asteroids: A comparison to desiccated carbonaceous chondrites2020

    • Author(s)
      Potin S.、Beck P.、Usui F.、Bonal L.、Vernazza P.、Schmitt B.
    • Journal Title

      Icarus

      Volume: 348 Pages: 113826-113826

    • DOI

      10.1016/j.icarus.2020.113826

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Q-type asteroids: Possibility of non-fresh weathered surfaces2019

    • Author(s)
      Hasegawa, S., Hiroi, T., Ohtsuka, K., Ishiguro, M., Kuroda, D., Ito, T., Sasaki, S.
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 71 Issue: 5 Pages: 103-103

    • DOI

      10.1093/pasj/psz088

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Physical properties of near-Earth asteroids with a low delta-v: Survey of target candidates for the Hayabusa2 mission2018

    • Author(s)
      Hasegawa Sunao、他42名
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 70 Issue: 6 Pages: 114-114

    • DOI

      10.1093/pasj/psy119

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] AKARI/IRC near-infrared asteroid spectroscopic survey: AcuA-spec2018

    • Author(s)
      Usui Fumihiko、Hasegawa Sunao、Ootsubo Takafumi、Onaka Takashi
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 71 Issue: 1

    • DOI

      10.1093/pasj/psy125

    • NAID

      120006604633

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Significantly high polarization degree of the very low-albedo asteroid (152679) 1998 KU22018

    • Author(s)
      Kuroda Daisuke、Ishiguro Masateru、Watanabe Makoto、Hasegawa Sunao、Sekiguchi Tomohiko、Naito Hiroyuki、Usui Fumihiko、Imai Masataka、Sato Mitsuteru、Kuramoto Kiyoshi
    • Journal Title

      Astronomy & Astrophysics

      Volume: 611 Pages: 31-31

    • DOI

      10.1051/0004-6361/201732086

    • Related Report
      2018 Research-status Report 2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] The AKARI IRC asteroid flux catalogue: updated diameters and albedos2018

    • Author(s)
      Ali-Lagoa V.、Mueller T. G.、Usui F.、Hasegawa S.
    • Journal Title

      Astronomy and Astrophysics

      Volume: 612 Pages: A85-A85

    • DOI

      10.1051/0004-6361/201731806

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Follow-up observations for the Asteroid Catalog using AKARI Spectroscopic Observations2017

    • Author(s)
      Hasegawa Sunao、Kuroda Daisuke、Yanagisawa Kenshi、Usui Fumihiko
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 69 Issue: 6 Pages: 99-99

    • DOI

      10.1093/pasj/psx117

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Thermal Modeling of Comet-like Objects from AKARI Observation2017

    • Author(s)
      Bach Yoonsoo P.、Ishiguro Masateru、Usui Fumihiko
    • Journal Title

      The Astronomical Journal

      Volume: 154 Issue: 5 Pages: 202-202

    • DOI

      10.3847/1538-3881/aa8dfe

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Q-type asteroids: Possibility of having non-fresh weathered surfaces2020

    • Author(s)
      S. Hasegawa, T. Hiroi, K. Ohtsuka, M. Ishiguro, D. Kuroda, T. Ito, and S. Sasaki
    • Organizer
      51st Lunar and Planetary Science Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 近赤外線分光観測による小惑星母天体の内部構造探査2020

    • Author(s)
      臼井 文彦、長谷川 直、大坪 貴文、塩谷 圭吾、宮田 隆志、上塚 貴史、高遠 徳尚、北里 宏平
    • Organizer
      日本天文学会2020年春季年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] AKARI/IRC near-infrared asteroid spectroscopic survey: AcuA-spec2019

    • Author(s)
      F. Usui, S. Hasegawa, T. Ootsubo, and T. Onaka
    • Organizer
      Japan Geoscience Union Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Follow-up observations for AKARI/IRC near-infrared asteroid spectroscopic survey (AcuA-spec)2019

    • Author(s)
      S. Hasegawa, D. Kuroda, K. Yanagisawa, and F. Usui
    • Organizer
      Japan Geoscience Union Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Investigation of the Hydration Features of Asteroids with Carbonaceous Chondrites: Experimental Analysis and Comparison with Astronomical Observations2019

    • Author(s)
      S. Potin, P. Beck, L. Bonal, F. Usui, P. Vernazza, and B. Schmitt
    • Organizer
      82nd Annual Meeting of The Meteoritical Society
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Search for Water on Asteroids with TAO/MIMIZUKU2019

    • Author(s)
      Fumihiko Usui
    • Organizer
      Mid-infrared Astronomy --- Past 20 years & Future 20 years
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Near-Infrared Asteroid Spectroscopic Survey with AKARI: Dehydration process of C-complex asteroids revealed by spectral features in 2.7 um band2019

    • Author(s)
      Fumihiko Usui, Sunao Hasegawa, Takafumi Ootsubo
    • Organizer
      EPSC-DPS Joint Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 近赤外線分光観測による小惑星族母天体の内部構造探査計画2019

    • Author(s)
      臼井 文彦、長谷川 直、大坪 貴文
    • Organizer
      日本惑星科学会2019年秋季講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Q型小惑星:風化した表層である可能性2019

    • Author(s)
      長谷川 直、廣井 孝弘、大塚 勝仁、石黒 正晃、 黒田 大介、伊藤 孝士、佐々木 晶
    • Organizer
      日本惑星科学会2019年秋季講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Dehydration Process of C-Complex Asteroids Revealed Through Near-Infrared Spectroscopy2019

    • Author(s)
      F. Usui, S. Hasegawa, T. Ootsubo, K. Amano, and T. Nakamura
    • Organizer
      Asteroid Science in the Age of Hayabusa2 and OSIRIS-REx
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] AKARI Near-Infrared Asteroid Spectroscopic Survey2019

    • Author(s)
      Fumihiko Usui
    • Organizer
      Thermal Models for Planetary Science III
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Exploring Hydrated Minerals on Asteroids with AKARI2019

    • Author(s)
      F. Usui, S. Hasegawa, T. Ootsubo, T. Onaka
    • Organizer
      50th Lunar and Planetary Science Conference
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Comets, asteroids and interplanetary dust as seen in near- to far-infrared with AKARI2018

    • Author(s)
      T. Ootsubo, F. Usui, S. Hasegawa, T. G. Mueller, V. Ali-Lagoa, J. Pyo, A. Takahashi, D. Ishihara, S. Takaba, and H. Kawakita
    • Organizer
      42nd COSPAR Scientific Assembly
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Spectroscopic, spectrophotometric, and periodic observations for low delta-v near-Earth asteroids2018

    • Author(s)
      S. Hasegawa, et al.
    • Organizer
      Japan Geoscience Union Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Toward an innovative asteroid mineralogy: comparative study of asteroid and meteorite spectra in the 3-micron band2018

    • Author(s)
      F. Usui, S. Hasegawa, T. Ootsubo, and T. Nakamura
    • Organizer
      Japan Geoscience Union Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] はやぶさ2のバックアップ天体捜索の為の観測:近地球小惑星の物理特性2018

    • Author(s)
      長谷川直 他42名
    • Organizer
      日本惑星科学会秋季講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] 赤外線天文衛星「あかり」近赤外線分光観測による小惑星の含水鉱物探査2018

    • Author(s)
      臼井文彦、長谷川直、大坪貴文
    • Organizer
      日本惑星科学会秋季講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] 天文観測と隕石分析で探るC型小惑星の熱的進化過程2018

    • Author(s)
      臼井 文彦、長谷川 直、大坪 貴文、中村 智樹
    • Organizer
      日本天文学会2018年秋季年会
    • Related Report
      2018 Research-status Report
  • [Presentation] 天文観測による小惑星の水関連物質探査2018

    • Author(s)
      臼井 文彦
    • Organizer
      第62回宇宙科学技術連合講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] Near-infrared asteroid spectroscopic survey with AKARI2017

    • Author(s)
      F. Usui, S. Hasegawa, and T. Ootsubo
    • Organizer
      Asteroids, Comets, Meteors 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Bus-DeMeo分類と物理観測から推定される小惑星表層組成: C,Cb,B型小惑星表層における水氷の存在の可能性2017

    • Author(s)
      長谷川直、黒田大介、柳澤顕史、臼井文彦
    • Organizer
      日本地球惑星科学連合2017年大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Investigation of hydrated minerals on the main belt asteroids from the AKARI near-infrared spectroscopy2017

    • Author(s)
      F. Usui, S. Hasegawa, and T. Ootsubo
    • Organizer
      JpGU-AGU Joint Meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] A Review of the Infrared Asteroid Survey with AKARI2017

    • Author(s)
      F. Usui
    • Organizer
      From Lijiang to the Oort Cloud: International Workshop on Solar System Small Bodies Exploration
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Search for Water on Asteroids with the AKARI Near-infrared Spectroscopy2017

    • Author(s)
      F. Usui, S. Hasegawa, T. Ootsubo, and T. Onaka
    • Organizer
      The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Remarks] 赤外線天文衛星「あかり」、小惑星に水を発見

    • URL

      http://www.kobe-u.ac.jp/research_at_kobe/NEWS/news/2018_12_17_01.html

    • Related Report
      2018 Research-status Report
  • [Remarks] 水を湛たたえた小惑星たち ─「あかり」による小惑星の含水鉱物探査

    • URL

      http://www.isas.jaxa.jp/feature/forefront/190325.html

    • Related Report
      2018 Research-status Report

URL: 

Published: 2017-04-28   Modified: 2021-02-19  

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