UBV photometry of Iapetus - Results from five apparitions

Details UBV photometry of Iapetus - Results from five apparitions UBV photometry of Iapetus - Results from five apparitions

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977icar...31...81m&link_type=abstract

Icarus, vol. 31, May 1977, p. 81-88.

Astronomy and Astrophysics

Astronomy

7

Astronomical Photometry, Brightness, Iapetus, Luminous Intensity, Ubv Spectra, Annual Variations, Light Curve, Polar Caps, Solar Position

Scientific paper

Measurements of the brightness and B-V color index of the leading and trailing hemispheres of Iapetus during the past five apparitions of Saturn are presented. The dependence of brightness on solar phase angle is determined for the two faces of the satellite. After correction for solar phase angle and distance effects, the brighter trailing hemisphere of Iapetus was found to be constant in brightness and color index throughout the interval covered by the observations. The brightness of the dark leading hemisphere, however, decreased by about 0.2 mag over the same period, and its B-V color index reddened by 0.05 mag. These changes are interpreted as evidence for the existence of a bright southern pole cap on Iapetus.

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