Shepherd Satellites
The discovery of two "shepherd" satellites has advanced our understanding of the structure of the Uranian rings.
shepherd satellite Satellite whose gravitational effect on a ring helps preserve the ring's shape. Examples are two satellites of Saturn, Prometheus and Pandora, whose orbits lie on either side of the F ring.
Shepherd Satellite
The gravitational influence of a moon in orbit near the edge of a planetary ring can have the effect of repelling the ring material.
Shepherd Satellite
A satellite that, by its gravitational field, confines particles to a planetary ring.
Shield Volcanoes ...
SHEPHERD SATELLITE
A shepherd satellite is a moon of a planet that orbits along side a ring of that planet; the gravitational forces of the moon confines the ring and giving it a sharp edge.
Shepherd satellites are moons that orbit within, or just beyond, a planet's ring system. They have the effect of sculpting the rings: giving them sharp edges, and creating gaps between them.
Shepherd Satellite
A satellite that constrains the extent of a planetary ring through gravitational forces. Also known as a shepherd moon.
A shepherd satellite for Saturn's A-ring.
Prometheus
Discovered: S. A. Collins & D. Carlson/Voyager 1, 1980 ...
Atlas seems to be a shepherd satellite of the A ring. Furthermore, in 2004 a faint, thin ring, temporarily designated R/2004 S 1, was discovered within Atlas's orbit.
The tiny moons can also act as shepherd satellites. Two shepherd satellites with one orbiting slightly outside the other satellite can constrain or shepherd the ring particles to stay between the moonlet orbits.
The rings, especially the thin outer ones, are kept in tidy order by Shepherd Satellites. These are small satellites that are found near thin ring sections that use their gravitational pull to keep the particles in the rings in their places.
This is a shaded relief map of Pandora, the outer F Ring shepherd satellite of Saturn. As with all maps, it is the cartographer's interpretation and not all features are necessarily certain given the limited data available.
Pandora is a shepherd satellite for the outer edge of Saturn's F Ring. It has a radius of about 55x44x31 km. Pandora orbits at 141,700 km from Saturn. Its orbital period is 0.62 earth days. Pandora was discovered by S. A. Collins and D.
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For some ringlets, there are two satellites lying inside and outside the ringlet, they are called shepherd satellites, that keep the stability of the ringlet. The following photo shows the shepherd satellites of the ring of Uranus.
Some gaps are cleared out by the passage of tiny moonlets such as Pan, many more of which may yet be undiscovered, and some ringlets seem to be maintained by the gravitational effects of small shepherd satellites such as Prometheus and Pandora.
Collins and others in 1980, is the inner shepherd satellite of Saturn's F ring. Prometheus was named after a man who stole fire from Olympus and gave it to humankind in Greek mythology. It is the third closest moon to the surface of Saturn.
density waves resulting from the mutual gravitational attraction of the ring particles. Narrow gaps in the rings are most likely swept clean of particles by small moonlets embedded in the rings. The tiny moons can also act as shepherd satellites ...
We shall find similar examples of shepherd moons for rings associated with other planets. Although such shepherd satellites clearly play a significant role in ring structures, we only partially understand the details of these roles.
Terrile in 1980 from photographs taken by Voyager 1 during its flyby of Saturn. Atlas is probably a shepherd satellite (a moon that limits the extent of a planetary ring through gravitational forces) of Saturn's A ring.
 See also: Satellite, Orbit, Saturn, Planet, Diameter
  
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