It works better for smaller impactors.
Small compared to the radius of the spherical body impacted. Essentially if you model impacts into a planar interface with a reasonable distribution of velocities, densities, and sizes.
Jay Melosh came up with an emperically derived formula fit to the results of such simulations, here.
In the case of any Ceres-Earth orbital intersection, the crater would probably take the form of a spheroidal molten ball of rock. Likely another reset of the geological clock to zero, like the Proto-Earth collision that formed the moon.