Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...64..320b&link_type=abstract
Icarus (ISSN 0019-1035), vol. 64, Nov. 1985, p. 320-328.
Astronomy and Astrophysics
Astronomy
45
Albedo, Astronomical Photometry, Light Scattering, Planetary Craters, Planetary Surfaces, Surface Roughness Effects, Lambert Surface, Phase Shift, Photogoniometers, Reflectance, Satellite Surfaces, Topography
Scientific paper
Topographic features affect the scattering properties of planetary surfaces by casting shadows and altering the local incidence and emission angles. Measurements of this phenomenon were obtained on the Cornell goniometer for both high and low albedo surfaces. For the low albedo surface, the decrease in reflected radiation due to topography increases sharply with increasing phase angle, whereas for the high albedo sample the effects are approximately constant between phase angles of 30 and 70 deg. The observations are in good agreement with a theoretical model in the case of the dark surface. However, for the high albedo surface the model overestimates the effects by a factor of 2, since it does not include the partial illumination of shadows by multiple scattering. For both high and low albedo surfaces, the effects of topography do not become significant until a phase angle of 30-40 deg.
Buratti Bonnie Jean
Veverka Joe
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