IR brightness and eclipse cooling of Saturn's rings

Details IR brightness and eclipse cooling of Saturn's rings IR brightness and eclipse cooling of Saturn's rings

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.283..842n&link_type=abstract

Nature, vol. 283, Feb. 28, 1980, p. 842, 843.

Astronomy and Astrophysics

Astronomy

6

Brightness Temperature, Eclipses, Infrared Astronomy, Saturn Rings, Telescopes, Saturn, Rings, Cooling, Eclipses, Infrared, Wavelengths, Ice, Absorption, Scattering, Photometry, Telescopic Observations, Models, Brightness Temperature, Data, Radiation, Optical Properties

Scientific paper

Equatorial scans of Saturn at 20 microns wavelength, obtained with the Mayall 4-m telescope in 1978-79, show a continuing decrease in the specific brightness of the A and B rings as the ring plane projection approaches and edge-on apparition. The decreased brightness of the previously dominant B ring reveals more clearly a large difference in brightness between the east and west ansae portions of the C ring, in contrast to a barely discernible difference for the other ring ansae. The amount of eclipse cooling is compatible with a C ring particle size of about 1 cm. It is proposed here that the B ring brightness variation could partially result from a decrease of absorbed insolation by a modest amount of visible scattering.

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