## Formation of sharp edges and planar areas of asteroids by polyhedral abrasion

Domokos, G.
Sipos, A. Á.
Szabó, Gy. M.
Várkonyi, P. L.
##### Description
While the number of asteroids with known shapes has drastically increased over the past few years, little is known on the the time-evolution of shapes and the underlying physical processes. Here we propose an averaged abrasion model based on micro-collisons, accounting for asteroids not necessarily evolving toward regular spheroids, rather (depending on the fall-back rate of ejecta) following an alternative path, thus confirming photometry-derived features, e.g. existence of large, relatively flat areas separated by edges. We show that our model is realistic, since the bulk of the collisions falls into this category.
Comment: 17 pages, 3 figures, accepted by Astrophysical Journal
##### Keywords
Astrophysics - Earth and Planetary Astrophysics