The orbital evolution of the asteroid Eros and implications for collision with the Earth

被引:38
作者
Michel, P [1 ]
Farinella, P [1 ]
Froeschle, C [1 ]
机构
[1] UNIV PISA,DIPARTIMENTO MATEMAT,I-56127 PISA,ITALY
关键词
D O I
10.1038/380689a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
THE population of asteroids that cross the Earth's orbit is responsible for most of the terrestrial impacts of kilometre-size objects, of which there may be several per million years(1). About 150 Earth-crossing asteroids are known, although many more are thought to exist(2). Asteroids that come close to the Earth's orbit, but do not currently cross it, may also pose a threat if they evolve onto Earth crossing orbits. The asteroid 433 Eros, with a diameter of similar to 22 km and a perihelion of 1.13 AU (where 1 AU is the average distance of the Earth from the Sun), is the second-largest near-Earth asteroid(3). Here we report a study of the dynamical evolution of Eros's orbit over a period of two million years. We identify an orbital resonance with Mars that has the potential to perturb Mars-crossing asteroids, such as Eros, onto Earth-crossing orbits; of eight trial orbits that closely match Eros's present orbital parameters, three become Earth-crossing on the timescale of our simulations, and one of these hits the Earth after 1.14 Myr. Although our simulations indicate no significant danger of a catastrophic impact by this large near-Earth asteroid during the next similar to 10(5) years, such a collision is likely in the far future.
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页码:689 / 691
页数:3
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