Caliban (moon)
Caliban is the second-largest irregular satellite of Uranus. It was discovered on 6 September 1997 by Brett J. Gladman, Philip D. Nicholson, Joseph A. Burns, and John J. Kavelaars using the 200-inch Hale Telescope together with Sycorax and given the temporary designation S/1997 U 1.
Designated Uranus XVI, it was named after the monster character in William Shakespeare's play The Tempest.
Orbit
Caliban follows a distant orbit, more than 10 times further from Uranus than Oberon, the outermost regular moon. Its orbit is retrograde, moderately inclined and slightly eccentric. The orbital parameters suggest that it may belong to the same dynamic cluster as Stephano and Francisco, suggesting a common origin.The diagram illustrates the orbital parameters of the retrograde irregular satellites of Uranus with the eccentricity of the orbits represented by the segments extending from the pericentre to the apocentre.
Physical characteristics
Caliban's diameter is estimated to be around, based on thermal measurements by the Herschel Space Observatory. Its albedo is estimated at around 0.22, which is unusually high compared to those of other Uranian irregular satellites. Neptune's largest irregular satellite, Nereid, has a similarly high albedo as Caliban.Somewhat inconsistent reports put Caliban in the light-red category, redder than Himalia but still less red than most Kuiper belt objects. Caliban may be slightly redder than Sycorax. It also absorbs light at 0.7 μm, and one group of astronomers think this may be a result of liquid water that modified the surface.
Measurements of Caliban's light curve by the Kepler space telescope indicate that its rotation period is about 9.9 hours.