![]() We have used the model results to make an estimate of the impactor diameter for the (596) Scheila collision of D = 49–65 m depending on the impactor taxonomy, which is broadly consistent with previous estimates. As expected the photometric signal increases with impactor size, but we find also that the photometric signature decreases rapidly as the target asteroid diameter increases, due to gravitational fallback. We estimate the magnitude change between a series of target/impactor pairs, assuming it is given by the increase in reflecting surface area within a photometric aperture due to the resulting ejecta. Icarus, 187, 345–356) and models the ejecta expansion following an impact as occurring in discrete shells each with their own velocity. ![]() It is based on the cratering scaling laws of Holsapple and Housen (Holsapple, K.A., Housen, K.R. We have developed a model to predict the post-collision brightness increase of sub-catastrophic collisions between asteroids and to evaluate the likelihood of a survey detecting these events.
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