Migration of Small Bodies and Dust to the Terrestrial Planets

Details Migration of Small Bodies and Dust to the Terrestrial Planets Migration of Small Bodies and Dust to the Terrestrial Planets

2004-10-29

arxiv.org/abs/astro-ph/0411005v1

Proc. IAU Coll. 197, 2005, pp. 399-404

Astronomy and Astrophysics

Astrophysics

Submitted to Proc. of the IAU Colloquium N 197 "Dynamics of populations of planetary systems" (Belgrade, Serbia and Montenegro

Scientific paper

10.1017/S1743921304008907

We integrated the orbital evolution of 30,000 Jupiter-family comets, 1300 resonant asteroids, and 7000 asteroidal, trans-Neptunian, and cometary dust particles. For initial orbital elements of bodies close to those of Comets 2P, 10P, 44P, and 113P, a few objects got Earth-crossing orbits with semi-major axes $a$$<$2 AU and moved in such orbits for more than 1 Myr (up to tens or even hundreds of Myrs). Four objects (from 2P and 10P runs) even got inner-Earth orbits (with aphelion distance $Q$$<$0.983 AU) and Aten orbits for Myrs. Our results show that the trans-Neptunian belt can provide a significant portion of near-Earth objects, or the number of trans-Neptunian objects migrating inside the solar system can be smaller than it was earlier considered, or most of 1-km former trans-Neptunian objects that had got near-Earth object orbits for millions of years disintegrated into mini-comets and dust during a smaller part of their dynamical lifetimes. The probability of a collision of an asteroidal or cometary particle during its lifetime with the Earth was maximum at diameter $d$$\sim$100 $\mu$m. At $d$$<$10 $\mu$m such probability for trans-Neptunian particles was less than that for asteroidal particles by less than an order of magnitude, so the fraction of trans-Neptunian particles with such diameter near Earth can be considerable.

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