Science. 1970 Jun 19;168(3938):1445-7. doi: 10.1126/science.168.3938.1445.
The spectral reflectivity (0.30 to 1.10 microns) of several asteroids has been measured for the first time. The reflection spectrum for Vesta contains a strong absorption band centered near 0.9 micron and a weaker absorption feature between 0.5 and 0.6 micron. The reflectivity decreases strongly in the ultraviolet. The reflection spectrum for the asteroid Pallas and probably for Ceres does not contain the 0.9-micron band. Vesta shows the strongest and best-defined absorption bands yet seen in the reflection spectrum for the solid surface of an object in the solar system. The strong 0.9-micron band arises from electronic absorptions in ferrous iron on the M2 site of a magnesian pyroxene. Comparison with laboratory measurements on meteorites and Apollo 11 samples indicates that the surface of Vesta has a composition very similar to that of certain basaltic achondrites.
首次测量了几颗小行星的光谱反射率（0.30 至 1.10 微米）。灶神星的反射光谱在 0.9 微米附近有一个很强的吸收带，在 0.5 到 0.6 微米之间有一个较弱的吸收特征。在紫外线下，反射率强烈下降。小行星帕拉斯和可能还有谷神星的反射光谱没有包含 0.9 微米带。灶神星显示了太阳系固体表面物体反射光谱中迄今为止最强和最清晰的吸收带。强烈的 0.9 微米带是由镁质辉石 M2 位上的亚铁电子吸收引起的。与陨石和阿波罗 11 号样本的实验室测量结果进行比较表明，灶神星的表面成分与某些玄武质无球粒陨石非常相似。
