Near-opposition limb darkening of solids of planetary interest

Details Near-opposition limb darkening of solids of planetary interest Near-opposition limb darkening of solids of planetary interest

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...33..368v&link_type=abstract

Icarus, vol. 33, Feb. 1978, p. 368-379.

Astronomy and Astrophysics

Astronomy

8

Astronomical Photometry, Light Scattering, Limb Darkening, Planetary Surfaces, Charcoal, Goniometers, Granular Materials, Magnesium Oxides, Minerals, Surface Roughness Effects, Wavelengths, Limbs, Scattering, Albedo, Satellites, Spectrum, Darkening, Particles, Surface, Olivines, Textures, Ephemeris, Bronzite, Graphite, Asteroids

Scientific paper

Results 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.

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