Computer Science
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sosyr..29..261i&link_type=abstract
Solar Syst. Res., vol. 29, p. 261-330 (1995)
Computer Science
10
Small Bodies, Asteroids, Near-Earth Objects, Trans-Neptunian Belt, Solar System
Scientific paper
The present migration of bodies to the Earth from the asteroid and trans-Neptune belts is investigated. Computer simulations of the evolution of disks that originally consisted of planets and hundreds of bodies located in various regions of the Solar System were carried out. It was found that either perihelia or aphelia of orbits of bodies that collide the Earth lie mainly near the Earth's orbit. The orbit of a near-Earth asteroid (NEA) varies significantly before the collision of an NEA with the planet. Most of the asteroids of the Amor group should have come from the asteroid belt. Mean lifetimes of the main-belt asteroids with diameter less than 100 km are shorter than the age of the Solar System. A certain fraction of bodies migrating to the Earth from various regions of the Solar System, has replenished the family of asteroids with orbits entirely inside Earth's orbit, and several of them lie inside the orbit of Venus. The number of asteroids of this family may be large. If the orbital elements of two celestial bodies vary before their collision, the characteristic time elapsed up to this collision may be several times less than that for fixed average inclinations and eccentricities. The mean time between collisions of NEAs with diameters greater than 1 km with Earth may be less than 100 000 yr. The number of NEAs that are ejected into hyperbolic orbits is about ten times as large as the number of objects colliding with Earth. For most bodies that collide with Earth, the time interval between settling into an orbit intersecting with the Earth's orbit and colliding with Earth does not exceed 10 Myr.
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