F Ring

Outermost of Saturn's rings easily visible to the unaided eye.

Shepherd Moons

 * Inner: Prometheus
 * Outer: Pandora

Perturbation
Prometheus' orbit is eccentric enough that it overlaps the inner edge of the ring at apoapsis, creating a compression streamer in the ring with each encounter. This streamer is quickly stretched along the length of the ring by differential rotation. This, together with further disruption by several moonlets orbiting inside the ring make the F Ring the most dynamic of Saturn's rings.