Delivery of Material from the Asteroid Belt
The delivery of bodies from the main asteroid belt to Earth-crossing orbits requires a complex scenario that involves disruptive asteroidal collisions as well as gravitational and non-gravitational dynamical transport processes. We review the recent developments in this field that have lead to substantial modifications of the scenario envisaged until the early 1990s. We avoid discussion of still poorly understood primordial delivery of material onto the Earth before the “Late Heavy Bombardment” period and focus on the transport mechanism at later stages of the solar system evolution. It now appears that the delivery process is not the same for meter-sized meteorites and kilometer-sized near-Earth asteroids, and that a variety of resonant effects play a significant role on different time scales. Although it seems likely that the main asteroid belt can supply the vast majority of the macroscopic bodies hitting the Earth, a quantitative model of this process requires further progress in both the theoretical and the observational areas.
KeywordsOrdinary Chondrite Asteroid Belt Main Belt Main Asteroid Belt Secular Resonance
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