Further characterization of carbonaceous materials in Hayabusa‐returned samples to understand their origin

1Masayuki Uesugi,2Motoo Ito,3Hikaru Yabuta,4Hiroshi Naraoka,4Fumio Kitajima,5Yoshinori Takano,6Hajime Mita,7Yoko Kebukawa,8Aiko Nakato,9Yuzuru Karouji
Meteoritics & Planetary Science (in Press) Link to Article [https://doi.org/10.1111/maps.13236]
1Japan Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo, 679‐5198 Japan
2Institute for Core Sample Research, Japan Agency for Marine‐Earth Science Technology (JAMSTEC), Nankoku, Kochi, 783‐8502 Japan
3Department of Earth and Planetary Systems Science, Hiroshima University, Hiroshima, 739‐8526 Japan
4Department of Earth and Planetary Science, Faculty of Science, Kyushu University, Hakozaki, Fukuoka, 812‐8581 Japan
5Department of Biogeochemistry, Japan Agency for Marine‐Earth Science and Technology (JAMSTEC), Yokosuka, 237‐0061 Japan
6Life, Environment and Materials Science, Fukuoka Institute of Technology, Fukuoka, 811‐0295 Japan
7Faculty of Engineering, Yokohama National University, Yokohama, 240‐8501 Japan
8Division of Earth and Planetary Sciences, Kyoto University,Sakyo, Kyoto, 606‐8502 Japan
9Space Exploration Innovation Hub Center, Japan Aerospace Exploration Agency (JAXA), , Sagamihara, Kanagawa, 252‐5210 Japan
Published by arrangement with John Wiley & Sons

Carbonaceous materials in the sample catcher of the Hayabusa spacecraft were assigned as category 3 particles. We investigated the category 3 particles with a suite of in situ microanalytical methods. Possible contaminants collected from the cleanrooms of the spacecraft assembly and extraterrestrial sample curation center (ESCuC) were also analyzed in the same manner as category 3 particles for comparison. Our data were integrated with those of the preliminary examination team for category 3 particles. Possible origins for the category 3 particles include contamination before and after the operation of the Hayabusa spacecraft.

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