Collisional history of asteroids: Evidence from Vesta and the Hirayama families

Details Collisional history of asteroids: Evidence from Vesta and the Hirayama families Collisional history of asteroids: Evidence from Vesta and the Hirayama families

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...62...30d&link_type=abstract

Icarus (ISSN 0019-1035), vol. 62, April 1985, p. 30-53.

Computer Science

172

Collision Parameters, Ejecta, Planetary Evolution, Vesta Asteroid, Asteroid Belts, Kinetic Energy, Planetary Craters, Planetary Mass, Planetary Rotation, Populations, Asteroids, Collisions, History, Vesta, Hirayama, Asteroid Belts, Abundance, Simulations, Evolution, Theoretical Studies, Distribution, Size, Composition, Models, Calculations, Gravity Effects, Strength, Themis, Eos, Parent Bodies, Comparisons, Observations

Scientific paper

Numerical simulations of the collisional evolution of hypothetical initial asteroid populations have been run which are subject to three constraints: they must evolve to the current asteroid size distribution, preserve Vesta's basaltic crust, and produce at least the observed number of major Hirayama families. A 'runaway growth' initial asteroid population distribution is found to best satisfy these constraints, and a model is developed for the calculation of fragment size distribution in the disruption of large, gravitationally bound bodies in which the material strength is enhanced by hydrostatic self-compression. This model predicts that large asteroids behave as intrinsically strong bodies despite histories of collisional fracture.

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