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About Prospero
Prospero, also known as Uranus XVIII and previously as S/1999 U 3, is an irregular moon of Uranus. It was discovered on 18 July 1999 by Matthew Holman and his team and it was named after the sorcerer Prospero in William Shakespeare's play The Tempest. Prospero orbits Uranus at an average distance of 16.2 million km (10.1 million mi) and takes about 1978 Earth days to complete one orbit. Prospero is estimated to be about 50 km (31 mi) in diameter and although many of its physical properties are still unknown, telescope observations suggest that it has an elongated shape and a rotation period of either 7 or 14 hours.
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