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V. Zappala, A. Cellino, P. Michel, P. Tanga (Astronomical Obesrvatory of Torino)
By means of recent models suitable for describing size and velocity-size distributions of fragments after a catastrophic break-up, it has been possible to simulate the outcome of a given impact phenomenon as a function of the mass ratio between the Largest Remnant and the Parent Body. In the present paper, the model has been applied to all the known asteroids in order to look for the best candidates to inject km-sized fragments inside the 3/1 mean motion resonance with Jupiter. As a preliminary result we have seen that only a very few objects are able to inject a not negligible amount of fragments larger than 2 km into the resonance, without producing a well detectable family. Taking into account the probability of a break-up with a given mass ratio, the model will allow to establish the injection rate of km-sized objects into the most efficient resonances, and consequently the rate of NEAs coming from these sources.