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Space Science Reviews

, Volume 163, Issue 1–4, pp 41–61 | Cite as

The Origin and Evolution of the Asteroid Belt—Implications for Vesta and Ceres

  • David P. O’Brien
  • Mark V. Sykes
Article

Abstract

Vesta and Ceres are the largest members of the asteroid belt, surviving from the earliest phases of Solar System history. They formed at a time when the asteroid belt was much more massive than it is today and were witness to its dramatic evolution, where planetary embryos were formed and lost, where the collisional environment shifted from accretional to destructive, and where the current size distribution of asteroids was sculpted by mutual collisions and most of the asteroids originally present were lost by dynamical processes. Since these early times, the environment of the asteroid belt has become relatively quiescent, though over the long history of the Solar System the surfaces of Vesta and Ceres continue to record and be influenced by impacts, most notably the south polar cratering event on Vesta. As a consequence of such impacts, Vesta has contributed a significant family of asteroids to the main belt, which is the likely source of the HED meteorites on Earth. No similar contribution to the main belt (or meteorites) is evident for Ceres. Through studies of craters, the surfaces of these asteroids will offer an opportunity for Dawn to probe the modern population of small asteroids in a size regime not directly observable from Earth.

Keywords

Asteroids Asteroid dynamics Asteroid collisional evolution Asteroid Vesta Asteroid Ceres Asteroid families Planet formation Impacts 

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© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Planetary Science InstituteTucsonUSA

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