Formation and migration of trans-Neptunian objects to the terrestrial planets

Details Formation and migration of trans-Neptunian objects to the terrestrial planets Formation and migration of trans-Neptunian objects to the terrestrial planets

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001nea..conf..388i&link_type=abstract

Near-Earth astronomy of XXI century, Proceedings of the conference, held 21-25 May, 2001, Zvenigorod, Russia, p. 388-400 (2001).

Astronomy and Astrophysics

Astronomy

Trans-Neptunian Objects, Terrestrial Planets, Near-Earth Objects

Scientific paper

Many large trans-Neptunian objects (TNOs) moving in orbits with relatively small eccentricities could be formed directly by compression of rarefied dust condensations but not by solid body accumulation. Most of "local" TNOs could be swept out by the planetesimals which entered from the zone of the giant planets during the accumulation of these planets. A small portion of these planetesimals could be left beyond Neptune's orbit in highly eccentric orbits. If we shall consider the number of TNOs with diameter d>1 km to be equal to 10^{10}, then we obtain that about 30000 former TNOs with d>1 km are moving in Jupiter-crossing orbits and about 170 of them are Earth-crossers. Thus, about 20% of Earth-crossing objects (ECOs) could be former TNOs now crossing both the orbits of Earth and Jupiter. It is possible that even more former TNOs move in Earth-crossing orbits entirely located inside Jupiter's orbit. The characteristic time elapsed up to a close encounter of an ECO with the Earth is greater by a factor of several than that for Apollos, the latter time is equal to 100 Myr.

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