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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Veröffentlicht in:	Science (American Association for the Advancement of Science) Jg. 364; H. 6437; S. 272
Hauptverfasser:	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
Sprache:	Englisch
Veröffentlicht:	United States 19.04.2019
ISSN:	1095-9203, 1095-9203
Online-Zugang:	Weitere Angaben
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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.
AbstractList	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. 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.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.
Author	Arai, T Morota, T Tanaka, S Brunetto, R Barucci, M A Shimaki, Y Matsuura, S Hirata, N Yoshioka, K Domingue, D L Komatsu, M Okada, T Suzuki, H Perna, D Saiki, T Sugita, S Kameda, S Yamaguchi, A Takato, N Kitazato, K Nakato, A Matsuoka, M Kouyama, T Milliken, R E Yamaguchi, T Iwata, T Nakamura, T Osawa, T Matsumoto, K Yoshikawa, M Shirai, K Terui, F Yamamoto, Y Matsunaga, T Poulet, F Sawada, H Tsumura, K Sakatani, N Bibring, J-P Yamada, M Ogawa, N Ohtake, M Ogawa, K Cho, Y Watanabe, S Yokota, Y Honda, C Hiroi, T Galiano, A Takagi, Y Nakazawa, S Pilorget, C Abe, M Nakauchi, Y Vilas, F Senshu, H Riu, L Honda, R Hayakawa, M Takei, Y Tsuda, Y Takir, D Palomba, E Tatsumi, E
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Copyright	Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.
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References	31000648 - Science. 2019 Apr 19;364(6437):230-231
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Snippet	The near-Earth asteroid 162173 Ryugu, the target of the Hayabusa2 sample-return mission, is thought to be a primitive carbonaceous object. We report...
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Title	The surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy
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