Migliorini F, Michel P, Morbidelli A, Nesvorny D, Zappala V
F. Migliorini, Armagh Observatory, College Hill BT61 9DG, Northern Ireland, United Kingdom, and Osservatorio Astronomico di Torino, I-10025 Pino Torinese, Italy. P. Michel, Osservatorio Astronomico di Torino, I-10025 Pino Torinese, Italy, and Obse.
Science. 1998 Sep 25;281(5385):2022-4. doi: 10.1126/science.281.5385.2022.
Orbital dynamic simulations show that many asteroids in the main asteroid belt are driven toward Mars-crossing orbits by numerous weak mean motion resonances, which slowly increase the orbital ellipticity of the asteroids. In addition, half of the Mars-crossing asteroids (MCAs) transition to Earth-crossing asteroids (ECAs) in less than 20 million years. This scenario quantitatively explains the observed number of large ECAs and MCAs.
轨道动力学模拟表明，主小行星带中的许多小行星由于众多微弱的平均运动共振而被驱向与火星相交的轨道，这些共振会缓慢增加小行星的轨道椭圆率。此外，一半的与火星相交小行星（MCA）在不到2000万年的时间内转变为与地球相交小行星（ECA）。这种情况定量地解释了观测到的大型ECA和MCA的数量。
