SPH model of a cratering on a D = 150 km target. Its cross section in the (x, y) plane is shown, with colors corresponding to the logarithm of velocity |v|. The number of SPH particles used was N_part ≐7.0 × 10⁵. The time t ≐ 100 s corresponds to the end of fragmentation phase. (The reaccumulation phase is computed later by an N-body model with self-gravity.) The original projectile had size d = 8 km, velocity v_imp = 6 km s⁻¹, and hit the target at a very oblique angle ϑ_imp = 75°. Green lines indicate the distances s which wouldbe travelled by particles within the ballistic time. Consequently, the diameter of the resulting (transient) crater should be at least d_crater ≃ 60 km.