Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990icar...83...27s&link_type=abstract
Icarus (ISSN 0019-1035), vol. 83, Jan. 1990, p. 27-38.
Astronomy and Astrophysics
Astronomy
71
Astronomical Models, Planetary Radiation, Planetary Surfaces, Surface Roughness Effects, Thermal Emission, Limb Darkening, Thermophysical Properties, Planets, Models, Atmosphereless Bodies, Surface, Tehrmal Properties, Thermal Emissions, Diurnal Variations, Temperature, Subsurface, Albedo, Heat Flow, Scattering, Beaming, Roughness, Moon, Asteroids, Geometry, Asteroids, Ceres, Wavelengths, Parameters, Calculations, Radiation, Conduction, Comparisons
Scientific paper
A model for determining diurnal temperatures in spherical-section depressions and which encompasses both subsurface heat-flow and direct and scattered sunlight effects is presently applied to the disk-integrated thermal emission of a rough planetary surface with nonzero thermal inertia. Attention is given to the variation with roughness and thermal inertia of the beaming parameter eta, which characterizes zero-phase thermal emission by comparison with a smooth, nonrotating body and is almost independent of albedo for a given surface roughness. The thermal phase curve of Ceres is noted to be well matched by the model features of (1) prograde rotation, (2) 44-deg rms surface slope, and (3) a thermal inertia that is 30 percent of the lunar value.
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