Online Planetary Science Impact Crater Estimator Online Planetary Science Impact Crater Estimator Estimate the size of an impact crater based on projectile and target properties. Impactor Properties Impactor Diameter [m] Impactor Velocity [km/s] Impact Angle: 45° Target Properties Target Body Earth Moon Mars Target Surface Sedimentary Rock Crystalline/Igneous Rock Ice Estimate Crater Size Crater Profile (Illustration) Download Report as PDF