Astrophysics (index)

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:

  • Metis (Jupiter)
  • Adrastea (Jupiter)
  • Cordelia (Uranus)
  • Ophelia (Uranus)
  • Galatea (Neptune)
  • Pan (Saturn)
  • Daphnis (Saturn)
  • Atlas (Saturn)
  • Prometheus (Saturn)
  • Pandora (Saturn)

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

index