Lunar occultation of Saturn. I - The diameters of Tethys, Dione, Rhea, Titan, and Iapetus

Details Lunar occultation of Saturn. I - The diameters of Tethys, Dione, Rhea, Titan, and Iapetus Lunar occultation of Saturn. I - The diameters of Tethys, Dione, Rhea, Titan, and Iapetus

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...26..387e&link_type=abstract

Icarus, vol. 26, Dec. 1975, p. 387-407.

Astronomy and Astrophysics

Astronomy

23

Dione, Iapetus, Lunar Occultation, Rhea (Astronomy), Size Determination, Tethys, Titan, Curve Fitting, Diameters, Least Squares Method, Light Curve, Limb Darkening

Scientific paper

The diameters of Tethys, Dione, Rhea, Titan and Iapetus were determined from observations of their March 30, 1974, lunar occultations, made with the Mauna Kea 224 and 61 cm telescopes. Light curves were obtained simultaneously in four colors, and the difference between the time of occultation at the two telescopes provided a direct measurement of the slope of the lunar limb, found to be small in all cases. The satellite diameters were determined by least-squares fits of model occultation light curves to the data. Titan's diameter must be at least 5800 km, much larger than the currently accepted value of 5000 km, making it the largest satellite in the solar system. This larger diameter implies a low mean density. For the other four satellites arguments are presented in favor of accepting the occultation diameters corresponding to limb darkened disks. Except for Titan, the lunar occultation diameters generally agree with previous diskmeter and radiometric determinations.

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