The surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy
Journal
Date Issued
2019
Author(s)
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.
•
•
•
•
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.
Abstract
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.
Funding(s)
Volume
364
Issue
6437
Start page
272
Issn Identifier
0036-8075
Ads BibCode
2019Sci...364..272K
Rights
restricted
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