Collision rates of the nominal target body (Table 2) with a radius of 10 m integrated over impactor masses larger than the indicated minimum mass. Top panel: orbital collision rate and bottom panel: stokes collision rate. Results are shown for three different slopes of the impactor mass distribution and in the bottom panel additionally for three different eccentricity and inclination values. is the equilibrium eccentricity in the vicinity of a mars mass perturber (Ida 1990; Thommes et al. 2003). The red shaded region depicts collisions more frequent than once every thousand years and the target mass m_t is indicated.