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

Details Orbits and masses of Saturn's co-orbiting satellites, Janus and Epimetheus Orbits and masses of Saturn's co-orbiting satellites, Janus and Epimetheus

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.1875y&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Nov. 1989, p. 1875-1889.

Astronomy and Astrophysics

Astronomy

37

Gravitational Effects, Janus, Orbital Elements, Planetary Mass, Satellite Imagery, Saturn Rings, Space Observations (From Earth), Voyager 1 Spacecraft, Voyager 2 Spacecraft

Scientific paper

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.

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