隼鸟2号近红外光谱法探测的小行星162173龙宫的表面成分。
The surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy.
作者信息
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, Arai T, 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, Hirata N, Yamaguchi A, Ogawa N, Terui F, Yamaguchi T, Takei Y, Saiki T, Nakazawa S, Tanaka S, Yoshikawa M, Watanabe S, Tsuda Y
机构信息
The University of Aizu, Fukushima, Japan.
Brown University, Providence, RI, USA.
出版信息
Science. 2019 Apr 19;364(6437):272-275. doi: 10.1126/science.aav7432. Epub 2019 Mar 19.
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.
近地小行星“龙宫”（162173 Ryugu）是隼鸟2号采样返回任务的目标，被认为是一个原始的碳质天体。我们报告了利用隼鸟2号上的近红外光谱仪（NIRS3）获取的“龙宫”表面反射光谱，以便为返回的样本提供表面成分和地质背景的直接测量数据。在整个观测表面检测到一个以2.72微米为中心的微弱、狭窄的吸收特征，表明含羟基（OH）的矿物在那里普遍存在。OH特征的强度和低反照率与热变质和/或冲击变质的碳质球粒陨石相似。OH波段位置几乎没有变化，这与“龙宫”是由未分化的水蚀变母体的撞击碎片形成的成分均匀的碎石堆天体一致。
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