SPH simulations of high-speed collisions between asteroids and comets

We studied impact processes by means of smoothed-particle hydrodynamics (SPH) simulations. The method was applied to modeling formation main-belt families during the cometary bombardment (either early or late, ${\sim}\,3.85\,{\rm Gy}$ ago). If asteroids were bombarded comets, as predicted Nice model, hundreds asteroid (catastrophic disruptions diameter $D \ge 100\,{\rm km}$ bodies) should have been created, but observed number is only 20. Therefore we computed a standard set 125 simulations collisions between representative = and high-speed icy projectiles (comets). According our results, largest remnant mass $M_{\rm lr}$ similar in low-speed collisions, due appropriate scaling with effective strength $Q_{\rm eff}$, fragment lf}$ exhibits systematic differences - it typically smaller for craterings bigger super-catastrophic events. This trend does not, however, explain non-existence old families. respective parametric relations can be used other statistical (Monte-Carlo) models better understand asteroidal populations.