 A number of localised objects such as S/2004 S 3, S/2004 S 4, and S/2004 S 6, sometimes surrounded by a dusty halo, have been seen in the vicinity of the F ring, but at present it is not clear whether they are all transient clumps or whether some may include small solid objects (moons).Uranus has by far the most extensive system of inner satellites, containing thirteen known moons