Astrophysics (index)about

Shepherd Moon

(Shepherding Moon)
(small moon at outer edge of a ring)

A Shepherd Moon is a small Moon at the outer edge of a ring or in a gap between rings, whose presence helps shape the ring, in particular to make the edge "sharp". Examples:

planet shepherd moons
Jupiter Metis, Adrastea
Saturn Pan, Daphnis, Atlas, Prometheus, Pandora
Uranus Cordelia, Ophelia
Neptune Galatea