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

(moons,rings,Jupiter,Uranus,Neptune,Saturn)
http://en.wikipedia.org/wiki/Planetary_ring

Referenced by:
ring system

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