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| The '''Hapke parameters''' are a set of parameters for a quasi-experimental model that are commonly used to describe the
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| [[Bidirectional reflectance distribution function|directional reflectance properties]] of the airless [[regolith]] surfaces of bodies in the [[solar system]]. They were developed by astronomer [[Bruce Hapke]] at the [[University of Pittsburgh]].
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| The quantities are:<ref name=HelVevTho96>{{cite journal | author= P. Helfenstein ''et al.''| title= Galileo Photometry of Asteroid 243 Ida| journal= Icarus| year= 1996| volume= 120 | issue= 1| pages= 48| bibcode= 1996Icar..120...48H| doi= 10.1006/icar.1996.0036}}</ref>
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| #<math>\bar{\omega}_0</math> — 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, <math>K_s/(K_s+K_a)</math>, where <math>K_s</math> is the [[scattering coefficient]], and <math>K_a</math> is the [[absorption coefficient]] <ref name=physicsworld1>[http://scienceworld.wolfram.com/physics/SingleScatteringAlbedo.html Single Scattering Albedo], scienceworld.wolfram.com.</ref>
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| #<math>h</math> — The width of the [[opposition effect|opposition surge]].
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| #<math>B_0</math> or <math>S_0</math> — The strength of the opposition surge.
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| #<math>P_0</math> or ''g'' — The particle phase function parameter, also called the asymmetry factor.
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| #<math>\theta</math> — The effective surface tilt, also called the macroscopic roughness angle.
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| 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]].
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| ==See also==
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| *[[albedo]]
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| *[[Geometric albedo]]
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| *[[Bidirectional reflectance distribution function]]
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| ==References==
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| <references/>
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| [[Category:Radiometry]]
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| [[Category:Scattering, absorption and radiative transfer (optics)]]
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Latest revision as of 11:55, 13 January 2015
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