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Near-opposition limb darkening of solids of planetary interestResults are presented for a general laboratory study of the limb darkening at small phase angles of various materials of planetary interest, with particular attention given to the wavelength dependence of limb darkening. Only substances stable at room temperature were measured, including basalt, graphite, mixtures of MgO and charcoal powders, olivine, goethite, bronzite, CaCO3, MgSO4, BaSO4, limonite, and hematite. Previous studies aimed at determining the nature of limb darkening at opposition for different common materials are reviewed. It is found that the scattering properties of most particulate materials near phase zero can be described adequately by Minnaert's law, but that such a representation is totally inadequate for materials that tend to fracture into flakes with mirrorlike surfaces (e.g., bronzite and graphite). The results also indicate that materials such as olivine have scattering properties within deep absorption bands which exhibit definite departures from Minnaert's law at large angles of incidence or emission.
Document ID
19780041779
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Veverka, J.
(Cornell Univ. Ithaca, NY, United States)
Goguen, J.
(Cornell Univ. Ithaca, NY, United States)
Yang, S.
(Cornell Univ. Ithaca, NY, United States)
Elliot, J. L.
(Cornell University Ithaca, N.Y., United States)
Date Acquired
August 9, 2013
Publication Date
February 1, 1978
Publication Information
Publication: Icarus
Volume: 33
Subject Category
Astronomy
Accession Number
78A25688
Funding Number(s)
CONTRACT_GRANT: NGR-33-010-082
CONTRACT_GRANT: NSG-7156
Distribution Limits
Public
Copyright
Other

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