Science. 1982 Jun 25;216(4553):1405-7. doi: 10.1126/science.216.4553.1405.
The distribution of compositional types among the asteroids is found to vary systematically with heliocentric distance. Seven distinct peaks in the relative proportion of the compositional types E, R, S, M, F, C, P, and D are found from 1.8 to 5.2 astronomical units. The inferred composition of the asteroids in each semimajor axis region is consistent with the theory that the asteroids accreted from the solar nebula at or near their present locations.
研究发现，小行星的成分类型分布与日心距离有系统的变化。在 1.8 到 5.2 天文单位的范围内，发现了 E、R、S、M、F、C、P 和 D 七种成分类型的相对比例的明显峰值。每个半长轴区域的小行星推断成分与小行星从太阳星云在其当前位置或附近吸积的理论一致。
