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Photopolarimetry of scattering surfaces and their interpretation by computer modelWolff's computer model of a rough planetary surface was simplified and revised. Close adherence to the actual geometry of a pitted surface and the inclusion of a function for diffuse light resulted in a quantitative model comparable to observations by planetary satellites and asteroids. A function is also derived to describe diffuse light emitted from a particulate surface. The function is in terms of the indices of refraction of the surface material, particle size, and viewing angles. Computer-generated plots describe the observable and theoretical light components for the Moon, Mercury, Mars and a spectrum of asteroids. Other plots describe the effects of changing surface material properties. Mathematical results are generated to relate the parameters of the negative polarization branch to the properties of surface pitting. An explanation is offered for the polarization of the rings of Saturn, and the average diameter of ring objects is found to be 30 to 40 centimeters.
Document ID
19800005746
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Wolff, M. (International Technical Associates, Inc. Long Beach, CA, United States)
Date Acquired
September 4, 2013
Publication Date
November 1, 1979
Subject Category
Lunar And Planetary Exploration
Report/Patent Number
NASA-CR-162514
Accession Number
80N14002
Funding Number(s)
CONTRACT_GRANT: NASW-3201
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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