AbstractWe estimated the rate of comet and asteroid collisions with the terrestrial planets by calculating the orbits of 13,000 Jupiter-crossing objects (JCOs) and 1300 resonant asteroids and computing the probabilities of collisions based on random-phase approximations and the orbital elements sampled with a 500 years step. The Bulirsh–Stoer and a symplectic orbit integrator gave similar results for orbital evolution, but may give different collision probabilities with the Sun. A small fraction of former JCOs reached orbits with aphelia inside Jupiter's orbit and some reached Apollo orbits with semi-major axes less than 2 AU, Aten orbits and inner-Earth orbits (with aphelia less than 0.983 AU) and remained there for millions of years. Though less than 0.1% of the total, these objects were responsible for most of the collision probability of former JCOs with Earth and Venus. We conclude that a significant fraction of near-Earth objects could be extinct comets that came from the trans-Neptunian region or most of such comets disintegrated during their motion in near-Earth object orbits.
Comet and asteroid hazard to the terrestrial planets
Advances in Space Research ; 33 , 9 ; 1524-1533
2003-04-10
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Comet and asteroid hazard to the terrestrial planets
British Library Conference Proceedings | 2004
|Comet and asteroid hazard to the terrestrial planets
Online Contents | 2004
|Online Contents | 1997
Numerical and Probabilistic Analysis of Asteroid and Comet Impact Hazard Mitigation
British Library Conference Proceedings | 2010
|On coordinated approach to the problem of asteroid-comet impact hazard
Online Contents | 2010
|