<P> Three small moons orbit between Mimas and Enceladus: Methone, Anthe, and Pallene . Named after the Alkyonides of Greek mythology, they are some of the smallest moons in the Saturn system . Anthe and Methone have very faint ring arcs along their orbits, whereas Pallene has a faint complete ring . Of these three moons, only Methone has been photographed at close range, showing it to be egg - shaped with very few or no craters . </P> <P> Trojan moons are a unique feature only known from the Saturnian system . A trojan body orbits at either the leading L or trailing L Lagrange point of a much larger object, such as a large moon or planet . Tethys has two trojan moons, Telesto (leading) and Calypso (trailing), and Dione also has two, Helene (leading) and Polydeuces (trailing). Helene is by far the largest trojan moon, while Polydeuces is the smallest and has the most chaotic orbit . These moons are coated with dusty material that has smoothened out their surfaces . </P> <P> These moons all orbit beyond the E Ring . They are: </P> <Ul> <Li> Rhea is the second - largest of Saturn's moons . In 2005 Cassini detected a depletion of electrons in the plasma wake of Rhea, which forms when the co-rotating plasma of Saturn's magnetosphere is absorbed by the moon . The depletion was hypothesized to be caused by the presence of dust - sized particles concentrated in a few faint equatorial rings . Such a ring system would make Rhea the only moon in the Solar System known to have rings . However, subsequent targeted observations of the putative ring plane from several angles by Cassini's narrow - angle camera turned up no evidence of the expected ring material, leaving the origin of the plasma observations unresolved . Otherwise Rhea has rather a typical heavily cratered surface, with the exceptions of a few large Dione - type fractures (wispy terrain) on the trailing hemisphere and a very faint "line" of material at the equator that may have been deposited by material deorbiting from present or former rings . Rhea also has two very large impact basins on its anti-Saturnian hemisphere, which are about 400 and 500 km across . The first, Tirawa, is roughly comparable to the Odysseus basin on Tethys . There is also a 48 km - diameter impact crater called Inktomi at 112 ° W that is prominent because of an extended system of bright rays, which may be one of the youngest craters on the inner moons of Saturn . No evidence of any endogenic activity has been discovered on the surface of Rhea . </Li> </Ul>

List saturn's moon's. briefly describe their characteristics