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Orbits and masses of Saturn's co-orbiting satellites, Janus and Epimetheus (1989)

Yoder, C. F. ; Synnott, S. P. ; Salo, H.

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Publication Date: 2011-08-19

Description: An attempt is made to provide a constraint on the combined mass of Janus and Epimetheus from an analysis of Voyager I and Voyager 2 data and ground-based observations obtained during the 1966 and 1980 ring plane crossings. The results of the analysis presented here suggest that the total mass is 2.59 + or - 0.26 x 10 to the 21st g, the mass ratio is 3.61 + or - 0.01, and Janus' density is 0.67 + or - 0.10 g/cu cm. The low density of Janus is attributed to its porosity rather than composition.

Keywords: LUNAR AND PLANETARY EXPLORATION

Type: Astronomical Journal (ISSN 0004-6256); 98; 1875-188

Format: text

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