S/2004 S 5: A new co-orbital companion for Dione
Abstract
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.
- Publication:
-
Icarus
- Pub Date:
- December 2005
- DOI:
- 10.1016/j.icarus.2005.06.009
- Bibcode:
- 2005Icar..179..222M