S/2004 S 5: A new co-orbital companion for Dione

Details S/2004 S 5: A new co-orbital companion for Dione S/2004 S 5: A new co-orbital companion for Dione

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005icar..179..222m&link_type=abstract

Icarus, Volume 179, Issue 1, p. 222-234.

Astronomy and Astrophysics

Astronomy

9

Scientific paper

We describe the astrometry and dynamics of S/2004 S 5 (provisionally named Polydeuces), a new satellite of Saturn, discovered in images recorded using the Imaging Science Subsystem (ISS) of the Cassini spacecraft. A total of 119 observations are presented, 101 of which were obtained with Cassini's narrow-angle camera and 18 using the wide-angle camera. Orbit determinations, based on a uniformly precessing ellipse model clearly showed S/2004 S 5 to be a possible co-orbital of Dione. By fitting a numerical solution of the full equations of motion to the available observations, we show that S/2004 S 5 is executing tadpole motion around Dione's L Lagrangian point, with a libration amplitude varying between +21.16±0.03° and -31.68±0.06° over a period of 791.3±0.1 days.

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