Polydeuces

Polydeuces is a moon of Saturn that orbits in resonance with Dione and Helene.

Orbit

The simulation to the right shows Dione, Helene, and Polydeuces in a rotating frame whose period matches the period of Dione. Saturn is the yellow circle in the middle. Dione traces the white stationary orbit. Helene traces the purple orbit from the L4 point. Polydeuces traces the green orbit from the L5 point.