PROSPERO (XVIII, 1999 U3) - MOON OF URANUS

Prospero (S/1999 U3), the 21st satellite of Uranus, is named after the master magician in Shakespeare's play The Tempest. Very little is known about Setebos. A small moon, it as an estimated 30 kilometres in diameter.

Orbit

Prospero orbits Uranus at an average distance of 1.6 million kilometres in a very elliptical and highly inclined retrograde orbit - opposite to that of Uranus itself and the planet's larger moons. It is very likely a captured asteroid.

Interior

The interior of Setebos is unknown.

Magnetic field

No magnetic field has been detected.

Atmosphere

No atmosphere has been detected.

Surface

Nothing is known about the surface of Prospero.