Measuring the sizes of Saturn's satellites

Details Measuring the sizes of Saturn's satellites Measuring the sizes of Saturn's satellites

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975s%26t....50..356v&link_type=abstract

Sky and Telescope, vol. 50, Dec. 1975, p. 356-359.

Astronomy and Astrophysics

Astronomy

1

Iapetus, Light Curve, Natural Satellites, Saturn (Planet), Size Determination, Titan, Astronomical Photometry, Lunar Occultation, Orbital Elements, Satellite Orbits

Scientific paper

Measurements made using single- and three-channel photometers during the March 29, 1974 occultation of Saturn and its satellites by the dark limb of the first-quarter moon have been used to calculate the diameters of the five brightest satellites (Tethys, Dione, Rhea, Titan, Iapetus). Two sets of diameters were calculated: one with the assumption of no limb darkening and one with the assumption of complete limb darkening according to Lambert's law. Albedo measurements suggest that the second assumption is correct. The calculated diameter for Titan assuming total darkening and a cloud height of 150 km is 5500 km, corresponding to a mean density of 1.6 gm/cu cm, a value significantly lower than that previously accepted.

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