Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...78..337s&link_type=abstract
Icarus (ISSN 0019-1035), vol. 78, April 1989, p. 337-354. Research supported by USAF.
Astronomy and Astrophysics
Astronomy
130
Albedo, Asteroids, Astrometry, Astronomical Models, Radiometers, Accuracy, Diameters, Infrared Spectra, Solar System, Thermal Analysis, Asteroids, Radiometry, Size, Diameter, Parameters, Calculations, Planets, Thermal Properties, Solar System, Satellites, Emissions, Latitude, Albedo, Surface, Roughness, Beaming, Airless Bodies, Intertia, Models, Rotation, Distance, Hypotheses
Scientific paper
Radiometric diameter determinations are presently shown to often be significantly affected by the effect of rotation. This thermal effect of rotation depends not only on the object's thermal inertia, rotation rate, and pole orientation, but also on its temperature, since colder objects having constant rotation rate and thermal inertia will radiate less of their heat on the diurnal than on the nocturnal hemisphere. A disk-integrated beaming parameter of 0.72 is determined for the moon, and used to correct empirically for the roughness effects in thermophysical models; the standard thermal model is found to systematically underestimate cold object diameters, while overstating their albedos.
Lebofsky Larry A.
Spencer John Robert
Sykes Mark V.
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