Six-color photometry of Iapetus, Titan, Rhea, Dione and Tethys

Details Six-color photometry of Iapetus, Titan, Rhea, Dione and Tethys Six-color photometry of Iapetus, Titan, Rhea, Dione and Tethys

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974icar...23..334n&link_type=abstract

Icarus, vol. 23, Nov. 1974, p. 334-354.

Astronomy and Astrophysics

Astronomy

24

Astronomical Photometry, Natural Satellites, Planetary Surfaces, Saturn (Planet), Albedo, Angular Distribution, Color, Dione, Electrophotometers, Iapetus, Light Curve, Rhea (Astronomy), Satellite Orbits, Surface Properties, Tables (Data), Tethys, Titan

Scientific paper

Six-color photometric observations made during Saturn's 1972/73 opposition enable us to separate the solar phase and orbital phase contributions to the observed light variations of Iapetus, Titan, Rhea, Dione and Tethys. Titan shows no orbital variations, but has phase coefficients which range from negligible values in the infrared to 0.014 mag/deg in the ultraviolet. Rhea has a bright leading side, a light curve amplitude of about 0.2 mag, and surprisingly large phase coefficients. Combined with other available information, the observations suggest a very porous, texturally complex surface layer. Dione has a leading side which is a few tenths of a magnitude brighter than the trailing side, but the light curve amplitude has little wavelength dependence and the phase coefficients are significantly smaller than those of Rhea, suggesting a less intricate surface texture. The leading side of Tethys is probably a few tenths of a magnitude brighter than the trailing side. Our Iapetus observations generally supplement the earlier work by Millis.

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