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The chemical composition of the asteroid Ryugu is determined by X-ray fluorescence analyses

Research Project

Project/Area Number 20H02773
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 34020:Analytical chemistry-related
Research InstitutionTokyo University of Science

Principal Investigator

NAKAI Izumi  東京理科大学, 理学部第一部応用化学科, 教授 (90155648)

Co-Investigator(Kenkyū-buntansha) 由井 宏治  東京理科大学, 理学部第一部化学科, 教授 (20313017)
圦本 尚義  北海道大学, 理学研究院, 教授 (80191485)
寺田 靖子  公益財団法人高輝度光科学研究センター, 分光推進室, 主幹研究員 (90307695)
阿部 善也  東京電機大学, 工学研究科, 助教 (90635864)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2022: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2021: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2020: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
Keywords蛍光X線分析 / 放射光X線分析 / はやぶさ2 / 小惑星試料 / XAFS / リュウグウ / ラマン分光分析 / X線顕微鏡 / リュウグウ試料 / 化学組成分析 / 全岩組成 / 蛍光X線分析 / はやぶさ2 / 化学組成 / 全岩化学組成
Outline of Research at the Start

昨年6月に地球から約3億4000万kmはなれた小惑星リュウグウに到着したはやぶさ2は、小惑星サンプルを採取し、地球に本年末に帰還する。JAXAのプロジェクトチームの一員として、我々はリュウグウ試料の化学組成を蛍光X線分析により決定し、太陽系の起源・進化の解明に寄与する情報の取得をめざしている。本研究では、分析条件の最適化を行い、来年の6月に実試料を分析しリュウグウの化学組成を正確に明らかにすることをゴールとする。同時にSPring-8の最先端の放射光X線分析も適用し、多角的な元素情報を取得する。後続の研究者へ試料を非破壊・無汚染で提供することも求められていることから難易度の高い分析である。

Outline of Final Research Achievements

We developed a technique to analyze whole rocks by wavelength dispersive-X-ray fluorescence (WD-XRF) without pressurizing and molding a trace powder sample of the asteroid Ryugu, which was successfully brought back to Earth by the aster-oid probe “Hayabusa 2.” The composition of Ryugu is similar to that of Ivuna-type carbonaceous meteorites (CI chondrite). The sample is characterized with a high water content, which could be directly quantified by determining its total oxygen (O) content. The fundamental parameter method using ferroalloy as a standard enabled the quantitative analysis of carbon (C). Energy dispersive XRF enabled the analysis of C by introducing an SDD detector that uses graphene as a detector window material. The proposed method allows the nondestructive analysis of light elements (C, O, and chlorine) and expands the applications of XRF analysis to a wide range of geological samples.

Academic Significance and Societal Importance of the Research Achievements

はやぶさ2が、リュウグウから持ち帰ることに成功した貴重な実試料を分析することができるので、起原の不明な隕石試料と比べて格段に高精度のデータがえられる。はやぶさ2により、小惑星の試料を地球に持ち帰ることに成功した夢とロマンのある試料の研究で多くの人の注目を集めた。このプロジェクトの成功により日本の宇宙科学技術の高さを世界に示すことが出来た。今回の化学分析は,人類初のC型小惑星物質の分析であり分析の学術的意義は大きい。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (20 results)

All 2023 2022 2021 2020

All Journal Article (12 results) (of which Int'l Joint Research: 9 results,  Peer Reviewed: 12 results,  Open Access: 8 results) Presentation (6 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results) Book (2 results)

  • [Journal Article] Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites2023

    • Author(s)
      Yokoyama Tetsuya、Nagashima Kazuhide、Nakai Izumi、Young Edward D.、Abe Yoshinari、Aleon Jerome、Alexander Conel M. O’D.、Amari Sachiko、Amelin Yuri、Bajo Ken-ichi ... Yabuta Hikaru ... et al.
    • Journal Title

      Science

      Volume: 379 Issue: 6634 Pages: 7850-7850

    • DOI

      10.1126/science.abn7850

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu2023

    • Author(s)
      Piani L., Nagashima K., Kawasaki N., Sakamoto N., Bajo K.-I., Yabuta H. et al.
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 946 Issue: 2 Pages: L43-L43

    • DOI

      10.3847/2041-8213/acc393

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] New analytical method for the evaluation of heterogeneity in cation compositions of dolomites by micro-XRF and Raman spectroscopies2023

    • Author(s)
      Morita Mayu、Urashima Shu-hei、Tsuchiya Hayato、Komatani Shintaro、Yui Hiroharu
    • Journal Title

      Analytical Sciences

      Volume: - Issue: 8 Pages: 1279-1285

    • DOI

      10.1007/s44211-023-00333-5

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild22022

    • Author(s)
      Kawasaki Noriyuki、Nagashima Kazuhide、Sakamoto Naoya、Matsumoto Toru、Bajo Ken-ichi、Wada Sohei、Igami Yohei、Miyake Akira、Noguchi Takaaki、Yamamoto Daiki ... Yabuta Hikaru ... et al.
    • Journal Title

      Science Advances

      Volume: 8 Issue: 50 Pages: 1-10

    • DOI

      10.1126/sciadv.ade2067

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis2022

    • Author(s)
      Paquet Marine、Moynier Frederic、Yokoyama Tetsuya、Dai Wei、Hu Yan、Abe Yoshinari、Aleon Jerome、O’D. Alexander Conel M.、Amari Sachiko、Amelin Yuri ... Yabuta Hikaru ... et al.
    • Journal Title

      Nature Astronomy

      Volume: 7 Issue: 2 Pages: 182-189

    • DOI

      10.1038/s41550-022-01846-1

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Solar System calcium isotopic composition inferred from Ryugu samples2022

    • Author(s)
      Moynier F.、Dai W.、Yokoyama T.、Hu Y.、Paquet M.、Abe Y.、Aleon J.、Alexander C.M.O'D、Amari S.、Amelin Y. ... Yabuta H. ... et al.
    • Journal Title

      Geochemical Perspectives Letters

      Volume: 24 Pages: 1-6

    • DOI

      10.7185/geochemlet.2238

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Presolar Stardust in Asteroid Ryugu2022

    • Author(s)
      Barosch Jens、Nittler Larry R.、Wang Jianhua、O’D. Alexander Conel M.、De Gregorio Bradley T.、Engrand Cecile、Kebukawa Yoko、Nagashima Kazuhide、Stroud Rhonda M.、Yabuta Hikaru et al.
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 935 Issue: 1 Pages: 1-12

    • DOI

      10.3847/2041-8213/ac83bd

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Practical Application of Elemental Imaging for Light Elements, Including Oxygen and Fluorine in Industrial Materials by Micro-EDXRF2022

    • Author(s)
      M. Morita, T. Aoyama, H. Nakano, S. Komatani
    • Journal Title

      Advances in X-ray Chemical Analysis

      Volume: 53 Pages: 139144-139144

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 日本全国土砂データベースによる埼玉県出土縄文土器の産地推定の試み2021

    • Author(s)
      親泊宗一郎,大屋道則,阿部善也,中井 泉
    • Journal Title

      X線分析の進歩

      Volume: 52 Pages: 212230-212230

    • NAID

      40022635474

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Evidence of metasomatism in the interior of Vesta2020

    • Author(s)
      Zhang Ai-Cheng、Kawasaki Noriyuki、Bao Huiming、Liu Jia、Qin Liping、Kuroda Minami、Gao Jian-Feng、Chen Li-Hui、He Ye、Sakamoto Naoya、Yurimoto Hisayoshi
    • Journal Title

      Nature Communications

      Volume: 11 Issue: 1 Pages: 1289-1289

    • DOI

      10.1038/s41467-020-15049-7

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Variations in initial 26Al/27Al ratios among fine-grained Ca-Al-rich inclusions from reduced CV chondrites2020

    • Author(s)
      Kawasaki Noriyuki、Wada Sohei、Park Changkun、Sakamoto Naoya、Yurimoto Hisayoshi
    • Journal Title

      Geochimica et Cosmochimica Acta

      Volume: 279 Pages: 1-15

    • DOI

      10.1016/j.gca.2020.03.045

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Cr-Zr-Ca armalcolite in lunar rocks is loveringite: Constraints from electron backscatter diffraction measurements.2020

    • Author(s)
      Ai-Cheng Zhang, Run-Lian Pang, Naoya Sakamoto, Hisayoshi Yurimoto
    • Journal Title

      American Mineralogist

      Volume: 105 Issue: 7 Pages: 1021-1029

    • DOI

      10.2138/am-2020-7260

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] リュウグウ小惑星試料のWD-XRF分析2022

    • Author(s)
      本間寿 , 阿部善也 , 寺田靖子 , 中井泉 , 圦本尚義
    • Organizer
      X線分析討論会
    • Related Report
      2022 Annual Research Report
  • [Presentation] リュウグウ小惑星試料のED-XRF分析2022

    • Author(s)
      森田麻由, 駒谷慎太郎 , 由井宏治 , 阿部善也, 寺田靖子 ,中井泉 , 圦本尚義
    • Organizer
      X線分析討論会
    • Related Report
      2022 Annual Research Report
  • [Presentation] リュウグウ小惑星試料の高エネルギー放射光蛍光X線分析2022

    • Author(s)
      阿部善也, 寺田靖子, 中井泉, 圦本尚義
    • Organizer
      X線分析討論会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Chemical and Isotopic Characterization of Asteroid Ryugu [#1377]2022

    • Author(s)
      H.Yurimoto, Hayabusa2-Initial-Analysis Chemistry Team
    • Organizer
      53rd Lunar and Planetary Science Conference (LPSC 2022, Houston, USA),
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Progress of chemical characterization of asteroid Ryugu samples2021

    • Author(s)
      H.. Yurimoto.
    • Organizer
      Hayabusa Symposium 2021 (on line)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Plenary: Age of Asteroid Sample Return.2020

    • Author(s)
      H. Yurimoto
    • Organizer
      Goldschmidt2020 ( Virtual, Global)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Book] 粉末X線解析の実際 (第3版)2021

    • Author(s)
      中井 泉、泉 富士夫
    • Total Pages
      308
    • Publisher
      朝倉書店
    • ISBN
      9784254141092
    • Related Report
      2021 Annual Research Report
  • [Book] 元素は語る - 考古化学で読む元素図鑑 -2020

    • Author(s)
      中井 泉
    • Total Pages
      240
    • Publisher
      ワニブックス
    • ISBN
      9784847066436
    • Related Report
      2020 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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