主带小行星

近地小行星与主带小行星和短周期彗星之间的关系。

The relation of NEAs to main-belt asteroids and to short period comets .

本文将仔细讨论这一问题，并以主带小行星的运动为例，较系统地介绍几种辛算法对应的显式辛差分格式。

In the paper this problem is discussed in some detail and the several corresponding explicit symplectic difference schemes have been constructed .

据了解，目前为公众熟悉的小行星有主带小行星，还有轨道比较奇怪的近地小行星和半人马小行星。

Currently , the public is familiar with the main-belt asteroids and the near-Earth asteroids with strange orbits , including the Earth-approaching asteroids and the centaurs .

最近的观测研究表明某些小行星可能是由彗星演变来的，而某些近地小行星可能来源于主带小行星和死亡的彗核。

Recent observations and studies indicate that some of asteroids have originally relation with comets and some of NEA originate probably form main-belt asteroids and extinct cometary nuclei .