Collisions of planetesimals from different parts of the feeding zone the terrestrial planets with the forming planets and the Moon embryo
Abstract
Computer simulations of the evolution of orbits of planetesimals were made for the feeding zone of the terrestrial planets. The gravitational influence of planets or their embryos was taken into account. The probabilities of collisions of planetesimals with planets or their embryos were calculated based on the orbital elements of migrated planetesimals. It was shown that the embryos of the terrestrial planets with masses which were not more than 0.1 of masses of the planets accumulated mainly material from neighbourhoods of their orbits. The amount of material from different parts of the zone from 0.7 to 1.5 AU from the Sun, which collided with almost formed the Earth and Venus, differed for these planets, probably, by no more than a factor of two. Inner layers of each terrestrial planet could accumulate mainly planetesimals from the neighbourhood of the orbit of this planet. The outer layers of the Earth and Venus could accumulate similar planetesimals from different regions of the feeding zone of the terrestrial planets. At the ratio of the masses of the embryos of the Earth and the Moon equaled to 81 (the ratio of the masses of the Earth and the Moon), the ratio of probabilities of collisions of planetesimals with the embryos of the Earth and the Moon in the considered calculations did not exceed 54. Based on a talk presented at the XI International Conference "Near-Earth Astronomy and Space Heritage" (Sep 30 - Oct 4, 2019, Kazan, Russia).
- Publication:
-
INASAN Science Reports
- Pub Date:
- August 2020
- DOI:
- 10.26087/INASAN.2020.5.3.004
- Bibcode:
- 2020INASR...5...97I