Interacting ellipsoids: a minimal model for the dynamics of Rubble-pile bodies

Details Interacting ellipsoids: a minimal model for the dynamics of Rubble-pile bodies Interacting ellipsoids: a minimal model for the dynamics of Rubble-pile bodies

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23..238r&link_type=abstract

Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 238-238

Astronomy and Astrophysics

Astronomy

Scientific paper

Rubble-pile asteroids are strength-less bodies formed by the gravitational re-accumulation of fragments after the breakup of large asteroids during energetic collisional events. Many collisional processes in the Solar System, like the formation of asteroid families, the tidal disruption of comets and NEAs and the formation of asteroid binaries and satellites may involve parent bodies with a rubble pile structure. We present here the results of a simple mechanical model recently introduced to study the dynamics of such kind of asteroids. In this model, a rubble-pile consists of N interacting fragments represented by rigid ellipsoids, and the equations of motion explicitly incorporate the minimal degrees of freedom necessary to describe the attitude and rotational state of each fragment. We perform different tests of this model and compare the results with those from hydrodynamical models and laboratory experiments. We find that, in spite of its simplicity, the model succeeds to reproduce most of the features expected from typical collisional events, and the energy and angular momentum transfer during high velocity collisions is well behaved.

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