Evidence for widespread hydrated minerals on asteroid (101955) Bennu
Evidence for widespread hydrated minerals on asteroid (101955) Bennu
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DOI：
10.1038/s41550-019-0722-2
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发表时间：
2019-04-01
期刊：
影响因子：
14.1
通讯作者：
Marty, B.
中科院分区：
文献类型：
--
作者：
Hamilton, V. E.;Simon, A. A.;Marty, B.
来自起源的早期光谱数据，光谱解释，资源识别和安全性 - 重制探索者（Osirisrex）任务揭示了在近地球小行反表面（101955）Bennu表面上有近翅片吸收的形式的大量水合矿物的证据2.7 MU M和热红外光谱特征与CM型碳质最相似软骨。我们在Bennu的表面上观察到这些光谱特征，并且没有证据表明在迄今为止观察到的数十至数百米的空间尺度下，旋转变异性很大。在可见的和近红外（0.4至2.4 mu M）中，Bennu的光谱显得无特征，并带有蓝色（负）斜坡，证实了以前的地面观测。 Bennu可能代表一类可能将挥发物和有机化学带到地球的物体。
Early spectral data from the Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRISREx) mission reveal evidence for abundant hydrated minerals on the surface of near-Earth asteroid (101955) Bennu in the form of a near-infrared absorption near 2.7 mu m and thermal infrared spectral features that are most similar to those of aqueously altered CM-type carbonaceous chondrites. We observe these spectral features across the surface of Bennu, and there is no evidence of substantial rotational variability at the spatial scales of tens to hundreds of metres observed to date. In the visible and near-infrared (0.4 to 2.4 mu m) Bennu's spectrum appears featureless and with a blue (negative) slope, confirming previous ground-based observations. Bennu may represent a class of objects that could have brought volatiles and organic chemistry to Earth.