摘要
利用Sunshine等人基于实验室标准矿物光谱提出的修正高斯模型(Modified Gaussian Model,MGM),对8颗Q型近地小行星的反射光谱进行分析,得到了所研究的Q型小行星表面主要矿物是斜方辉石和单斜辉石的结论,估算了单斜辉石的丰度,对3753号小行星呈现出的表面单斜辉石丰度很低的现象进行了分析.
Using the Modified Gaussian Model （MGM） method developed by Sunshine et al. to extract mineralogical information from the spectra of eight Q-type near-earth asteroids, we obtain their surface composition of orthopyroxene and clinopyroxene. We further get a compositional proportion of each asteroid： the abundance of clinopyroxene is about 70% on the suface of asteroids 5143, 7341, 66146, and 162058, and it is about 60% on the surface of asteroids 1862, 4688, and 5660, but only 43% on the surface of asteroid 3753. Then we analyse the reason of apparently low abundance of clinopyroxene on the surface of asteroid 3753. The level of metamorphism experienced by the asteroid increases with the decreasing of the distance from the center. So the asteroid 3753 is highly metamorphosed, and the abundance of clinopyroxene is low.
出处
《天文学报》
CSCD
北大核心
2016年第4期437-446,共10页
Acta Astronomica Sinica
基金
国家自然科学基金项目(11573075
11403107
11273067)
澳门科学技术发展基金项目(095/2013/A3)
紫金山天文台小行星基金会
澳门科技大学月球与行星科学实验室–中国科学院月球与深空探测重点实验室伙伴实验室资助
