A newly revised estimation of bulk densities and examination of the shape of individual Ryugu grains
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- Akiko Miyazaki
- Japan Aerospace Exploration Agency/ ISAS
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- Toru Yada
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Kasumi Yogata
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Kentaro Hatakeda
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Aiko Nakato
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Masahiro Nishimura
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Kana Nagashima
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Kazuya Kumagai
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Yuya Hitomi
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Hiromichi Soejima
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Rui Tahara
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Rei Kanemaru
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Arisa Nakano
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Miwa Yoshitake
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Ayako Iwamae
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Shizuho Furuya
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Akira Tsuchiyama
- Ritsumeikan University: Ritsumeikan Daigaku
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- Shogo Tachibana
- University of Tokyo Graduate School of Science Faculty of Science: Tokyo Daigaku Daigakuin Rigakukei Kenkyuka Rigakubu
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- Tatsuhiro Michikami
- Kindai University Faculty of Engineering: Kinki Daigaku Kogakubu Daigakuin System Kogaku Kenkyuka Hiroshima Campus
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- Tatsuaki Okada
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Masanao Abe
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
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- Tomohiro Usui
- Japan Aerospace Exploration Agency Institute of Space and Astronautical Science: Uchu Koku Kenkyu Kaihatsu Kiko Uchu Kagaku Kenkyujo
説明
<jats:title>Abstract</jats:title> <jats:p>The bulk density of grains from a celestial body is a fundamental property related to its composition and structure, providing a clue to understand the evolutionary history of the body. Here, we provide the bulk density of 637 grains returned from the C-type near-Earth asteroid 162173 Ryugu. This is the largest number of grains to date as a part of the curation activity, and corresponds to 38 wt.% of total returned samples (⁓5 g). Although several densities of the Ryugu grains were reported, some showed uncertainties in sample volume estimation. In this study, we applied a new volume estimation model calibrated by X-ray micro-computed tomography (XCT) to Ryugu grains to estimate their bulk density more accurately. The averaged bulk density of the Ryugu grains was 1.79±0.31 g/cm<jats:sup>3</jats:sup> (error is 1 standard deviation) for a wide range of weight of 0.5‒100 mg (sub-mm ‒10 mm in size) and for a variety of their 3D shapes characterized by the three axial length ratios. We also found that the average bulk densities of the two sampling sites on Ryugu, stored separately in the Chambers A and C of the sample container, were almost the same within error. The log plots in the weight (≥1.0 mg) and size (≥1.5 mm) distributions were approximately linear, and the slopes were approximately -1.1 and -3.4, respectively. The average bulk density of 637 Ryugu grains with >0.5 mg was almost the same as that of 16 Ryugu grains with XCT, and also consistent with the densities of CI chondrites (1.57 ‒2.12 g/cm<jats:sup>3</jats:sup>). The axial ratios of the 724 Ryugu grains and the particles ejected during the sampling operations (flying particles) were similar, which suggests relatively small Ryugu materials (mm‒cm in size) are similar in shape. The minor difference between Rygu grains and flying particles could be attributed to subsequent events such as scraping during sampling operations and transportation.</jats:p>
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 75 (1), 171-, 2023-04-27
Research Square Platform LLC
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キーワード
詳細情報 詳細情報について
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- CRID
- 1360022306717273984
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- ISSN
- 18805981
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE