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Related to shepherd satellites: Roche limit
shepherd satellites(shepherding satellites) Small satellites that gravitationally confine particles to a ring around a planet. In Saturn's ring system, Atlas orbits close to the outer edge of ring A, while ring F is confined by Prometheus and Pandora. Voyager 2 discovered Cordelia and Ophelia among Uranus' rings.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006