Volume 60, Issue 4 pp. 916-927
Report

Mineralogy of terminal grains recovered from the Tanpopo capture panel onboard the International Space Station

Takaaki Noguchi

Corresponding Author

Takaaki Noguchi

Division of Earth and Planetary Sciences, Kyoto University, Kyoto, Japan

Correspondence

Takaaki Noguchi, Division of Earth and Planetary Sciences, Kyoto University, Kitashirakawaoiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan.

Email: [email protected]

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Akira Miyake

Akira Miyake

Division of Earth and Planetary Sciences, Kyoto University, Kyoto, Japan

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Hikaru Yabuta

Hikaru Yabuta

Department of Earth and Planetary Systems Science, Hiroshima University, Hiroshima, Japan

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Yoko Kebukawa

Yoko Kebukawa

Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo, Japan

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Hiroki Suga

Hiroki Suga

NanoTerasu Promotion Division, Japan Synchrotron Radiation Research Institute, Sendai, Miyagi, Japan

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Makoto Tabata

Makoto Tabata

Faculty of Science, Chiba University, Chiba, Japan

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Kyoko Okudaira

Kyoko Okudaira

Division of Information Systems and Aizu Research Center for Space Informatics (ARC-Space), Department of Computer Science and Engineering, University of Aizu, Fukushima, Japan

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Akihiko Yamagishi

Akihiko Yamagishi

Department of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Tokyo, Japan

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H. Yano

H. Yano

Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa, Japan

Space and Astronautical Science, Graduate Institute for Advanced Studies, SOKENDAI, Sagamihara, Kanagawa, Japan

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First published: 19 February 2025

Editorial Handling—Donald Brownlee

Abstract

The Tanpopo experiment is Japan's first astrobiology mission aboard the Japanese Experiment Module Exposed Facility on the International Space Station. The Tanpopo-1 mission exposed silica aerogel panels to low Earth orbit from 2015 to 2016 to capture micrometeoroids. We identified an impact track measuring approximately 8 mm long, which contained terminal grains in the silica aerogel panel oriented toward space. The impact track exhibited a bulbous cavity with two thin, straight tracks branching from it, each preserving a terminal grain at their ends. The terminal grains were extracted from the silica aerogel and analyzed using scanning transmission electron microscopy and scanning transmission X-ray microscopy to investigate their X-ray absorption near-edge structure (STXM-XANES). Both grains are Fe-bearing and relatively homogeneous orthopyroxene crystals (En88.4±0.4 and En88.2±1.8). The recovery of Fe-bearing low-Ca pyroxene aligns with previous studies of micrometeoroids captured in LEO. Micrometeoroids containing Fe-bearing olivine and low-Ca pyroxene are likely abundant in LEO.

Data availability statement

Data are available on request from the authors.

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