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|Discovered by|| Mark R. Showalter|
and Jack J. Lissauer
|Discovered in||August 25, 2003|
|Semi-major axis||74,392 km|
|Orbital period||0.618 d|
|Inclination||0.1° (to Uranus' equator)|
|Is a moon of||Uranus|
|Mean diameter||~18 km (estimate)|
|Surface area||~1,000 km2 (estimate)|
|Volume||~3,000 km3 (estimate)|
|Mass||~3.8×1015 kg (estimate)|
|Mean density||~1.3 g/cm3 (estimate)|
|Surface gravity||~0.0031 m/s2 (estimate)|
|Escape velocity||~0.0076 km/s (estimate)|
|Rotation period||synchronous (assumed)|
|Axial tilt||zero (assumed)|
|Atmospheric pressure||0 kPa|
Cupid is an inner moon (which makes it one of the closer moons) of Uranus. It was found by Mark Showalter and Jack J. Lissauer in 2003 using the Hubble Space Telescope. It was named after a character in William Shakespeare's play Timon of Athens.
It is the smallest of the closer Uranian moons, estimated to be only about 18 km in diameter. This and the dark surface made it too dim to be detected by the Voyager 2 cameras during its Uranus flyby in 1986.
- Showalter, Mark R.; Lissauer, Jack J. (2005-12-22). "The Second Ring-Moon System of Uranus: Discovery and Dynamics". Science Express. . http://www.sciencemag.org/cgi/content/abstract/1122882v1.
- Showalter, M. R.; Lissauer, J. J. (September 25, 2003). "IAU Circular No. 8209". http://cfa-www.harvard.edu/iauc/08200/08209.html. Retrieved 2006-08-05.
- "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. http://planetarynames.wr.usgs.gov/append7.html. Retrieved 2006-08-05.
- Hubble Uncovers Smallest Moons Yet Seen Around Uranus – Hubble Space Telescope news release (2003-09-25)