Hapke parameters

The Hapke parameters are a set of parameters for an empirical model that is commonly used to describe the directional reflectance properties of the airless regolith surfaces of bodies in the solar system. The model has been developed by astronomer Bruce Hapke at the University of Pittsburgh.

The parameters are:

The Hapke parameters can be used to derive other albedo and scattering properties such as the geometric albedo, the phase integral, and the Bond albedo.