Spectral characterization of analog samples in anticipation of OSIRIS-REx's arrival at Bennu: A blind test study
Spectral characterization of analog samples in anticipation of OSIRIS-REx's arrival at Bennu: A blind test study
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DOI：
10.1016/j.icarus.2018.10.018
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发表时间：
2017-04
期刊：
影响因子：
3.2
通讯作者：
K. Hanna;D. Schrader;E. Cloutis;G. Cody;A. King;T. McCoy;D. Applin;J. Mann;Neil Bowles;J. Brucato;H. Connolly;E. Dotto;L. P. Keller;L. Lim;B. Clark;V. Hamilton;Cateline Lantz;D. Lauretta;S. S. Russell-S.;P. F. Schofield
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文献类型：
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作者：
K. Hanna;D. Schrader;E. Cloutis;G. Cody;A. King;T. McCoy;D. Applin;J. Mann;Neil Bowles;J. Brucato;H. Connolly;E. Dotto;L. P. Keller;L. Lim;B. Clark;V. Hamilton;Cateline Lantz;D. Lauretta;S. S. Russell-S.;P. F. Schofield
我们目前的光谱测量的一套矿物混合物和陨石，可能类似于小行星（101955）Bennu，美国宇航局的起源，光谱解释，资源识别，安全，风化层探测器（OSIRIS-REx）的目标小行星使命。样品套件，其中包括无水和水合矿物混合物和一套南极陨石（CM，CI，CV，CR和L5），被选择来表征光谱效应，由于不同量的水蚀变和少量的有机材料。我们的研究结果表明，矿物混合物的效用，了解陨石材料的混合行为，并确定在可见光到近红外（VNIR）和热红外（TIR）光谱范围内的光谱占主导地位的物种。我们的测量结果表明，即使在陨石光谱中有细微的特征，我们也可以识别出与组成每个样品的矿物有关的诊断特征。此外，这两个光谱范围的互补性质，关于他们的能力，以检测不同的混合物和陨石成分，可以用来更好地表征模拟样品的组成。然而，我们观察到的矿物混合物和陨石之间的VNIR和TIR光谱的差异。这些差异可能是由于（1）混合物与陨石中成分的类型和物理分布的差异，（2）我们没有添加到混合物中的陨石中观察到的缺失相，以及（3）样品之间的差异。除了模拟样品的初始表征外，我们还将使用这些光谱测量来测试相位检测和丰度确定算法，以预测Bennu的表面特性并选择采样点。
We present spectral measurements of a suite of mineral mixtures and meteorites that are possible analogs for asteroid (101955) Bennu, the target asteroid for NASA's Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer (OSIRIS-REx) mission. The sample suite, which includes anhydrous and hydrated mineral mixtures and a suite of chondritic meteorites (CM, CI, CV, CR, and L5), was chosen to characterize the spectral effects due to varying amounts of aqueous alteration and minor amounts of organic material. Our results demonstrate the utility of mineral mixtures for understanding the mixing behavior of meteoritic materials and identifying spectrally dominant species across the visible to near-infrared (VNIR) and thermal infrared (TIR) spectral ranges. Our measurements demonstrate that, even with subtle signatures in the spectra of chondritic meteorites, we can identify diagnostic features related to the minerals comprising each of the samples. Also, the complementary nature of the two spectral ranges regarding their ability to detect different mixture and meteorite components can be used to characterize analog sample compositions better. However, we observe differences in the VNIR and TIR spectra between the mineral mixtures and the meteorites. These differences likely result from (1) differences in the types and physical disposition of constituents in the mixtures versus in meteorites, (2) missing phases observed in meteorites that we did not add to the mixtures, and (3) albedo differences among the samples. In addition to the initial characterization of the analog samples, we will use these spectral measurements to test phase detection and abundance determination algorithms in anticipation of mapping Bennu's surface properties and selecting a sampling site.