- Hapke parameters
The Hapke parameters are a set of parameters for a quasi-experimental model that are commonly used to describe the
directional reflectance properties of the airlessregolith surfaces of bodies in thesolar system . They were developed by astronomerBruce Hapke at theUniversity of Pittsburgh .The quantities are cite journal | author= P. Helfenstein "et al"| title= "Galileo Photometry of Asteroid 243 Ida"| journal= Icarus| year= 1996| volume= 120| pages= 48| url= http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1996Icar..120...48H&db_key=AST&data_type=HTML&format=&high=444b66a47d10703| doi= 10.1006/icar.1996.0036] :
# — Single scattering
albedo . This is the ratio of scattering efficiency to total light extinction (which includes also absorption), for small-particle scattering of light. That is, , where is thescattering coefficient , and is theabsorption coefficient [http://scienceworld.wolfram.com/physics/SingleScatteringAlbedo.html Single Scattering Albedo] , scienceworld.wolfram.com.]
# — The width of the opposition surge.
# or — The strength of the opposition surge.
# or "g" — The particle phase function parameter, also called the asymmetry factor.
# — The effective surface tilt, also called the macroscopic roughness angle.The Hapke parameters can be used to derive other albedo and scattering properties such as the
geometric albedo , thephase integral , and theBond albedo .ee also
*
albedo
*Geometric albedo
*Bidirectional reflectance distribution function References
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