Lesson plan
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 main parameters are: # \bar{\omega}_0 — 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, K_s/(K_s+K_a) , where K_s is the scattering coefficient, and K_a is the absorption coefficient # h — The width of the opposition surge. # B_0 or S_0 — The strength of the opposition surge. # P_0 or g — The particle phase function parameter, also called the asymmetry factor. # \theta — 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, the phase integral, and the Bond albedo.
Article summary
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 main parameters are: # \bar{\omega}_0 — 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, K_s/(K_s+K_a) , where K_s is the scattering coefficient, and K_a is the absorption coefficient # h — The width of the opposition surge. # B_0 or S_0 — The strength of the opposition surge. # P_0 or g — The particle phase function parameter, also called the asymmetry factor. # \theta — 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, the phase integral, and the Bond albedo.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
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