HAYABUSA/AMICA数据的散射光校正和Itokawa的定量光谱比较
Scattered Light Correction of HAYABUSA/AMICA Data and Quantitative Spectral Comparisons of Itokawa
摘要：
隼鸟号航天器于2005年与其目标小行星25143 Itokawa会合，并于2010年将小行星样本带回地球。机载相机AMICA在会合阶段拍摄了1400多张Itokawa的照片。据报告，光学器件内部的光散射严重污染了AMICA图像。该效应使得难以在较长波长（>800 nm）下生成彩色图。本文通过对AMICA在飞行中拍摄到的丝川和月亮的暗晕的研究，提出了一种扣除散射光的方法。其结果是，我们发现，包括散射光校正的整体数据减少方案，使识别约3%的区域差异的相对反射光谱的Itokawa。我们证实，Itokawa的颜色变化在很大程度上归因于空间风化。
英文摘要：
The Hayabusa spacecraft rendezvoused with its target asteroid 25143 Itokawa in 2005 and brought an asteroidal sample back to the Earth in 2010. The onboard camera, AMICA, took more than 1400 images of Itokawa during the rendezvous phase. It was reported that the AMICA images were severely contaminated by light scatter inside the optics. The effect made it difficult to produce the color maps at longer wavelengths (>800 nm). In this paper, we demonstrate a method to subtract the scattered light by investigating the dim halos of Itokawa and the Moon taken by AMICA during the inflight operation. As the result, we found that the overall data reduction scheme including the scattered light correction enables to recognize ~3% regional differences in the relative reflectance spectra of Itokawa. We confirmed that the color variation in Itokawa was largely attributed to space weathering.
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