The surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy

The near-Earth asteroid 162173 Ryugu, the target of the Hayabusa2 sample-return mission, is thought to be a primitive carbonaceous object. We report reflectance spectra of Ryugu's surface acquired with the Near-Infrared Spectrometer (NIRS3) on Hayabusa2, to provide direct measurements of the su...

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Published in:Science (American Association for the Advancement of Science) Vol. 364; no. 6437; p. 272
Main Authors: Kitazato, K, Milliken, R E, Iwata, T, Abe, M, Ohtake, M, Matsuura, S, Arai, T, Nakauchi, Y, Nakamura, T, Matsuoka, M, Senshu, H, Hirata, N, Hiroi, T, Pilorget, C, Brunetto, R, Poulet, F, Riu, L, Bibring, J-P, Takir, D, Domingue, D L, Vilas, F, Barucci, M A, Perna, D, Palomba, E, Galiano, A, Tsumura, K, Osawa, T, Komatsu, M, Nakato, A, Takato, N, Matsunaga, T, Takagi, Y, Matsumoto, K, Kouyama, T, Yokota, Y, Tatsumi, E, Sakatani, N, Yamamoto, Y, Okada, T, Sugita, S, Honda, R, Morota, T, Kameda, S, Sawada, H, Honda, C, Yamada, M, Suzuki, H, Yoshioka, K, Hayakawa, M, Ogawa, K, Cho, Y, Shirai, K, Shimaki, Y, Yamaguchi, A, Ogawa, N, Terui, F, Yamaguchi, T, Takei, Y, Saiki, T, Nakazawa, S, Tanaka, S, Yoshikawa, M, Watanabe, S, Tsuda, Y
Format: Journal Article
Language:English
Published: United States 19.04.2019
ISSN:1095-9203, 1095-9203
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Summary:The near-Earth asteroid 162173 Ryugu, the target of the Hayabusa2 sample-return mission, is thought to be a primitive carbonaceous object. We report reflectance spectra of Ryugu's surface acquired with the Near-Infrared Spectrometer (NIRS3) on Hayabusa2, to provide direct measurements of the surface composition and geological context for the returned samples. A weak, narrow absorption feature centered at 2.72 micrometers was detected across the entire observed surface, indicating that hydroxyl (OH)-bearing minerals are ubiquitous there. The intensity of the OH feature and low albedo are similar to thermally and/or shock-metamorphosed carbonaceous chondrite meteorites. There are few variations in the OH-band position, which is consistent with Ryugu being a compositionally homogeneous rubble-pile object generated from impact fragments of an undifferentiated aqueously altered parent body.
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ISSN:1095-9203
1095-9203
DOI:10.1126/science.aav7432