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A retrograde satellite of Uranus outermost but one at a distance of 16 089 000 km; also known as Uranus XVIII. It orbits every 1948.1 days at an inclination of 146° to Uranus’s equator. Prospero has a diameter of about 50 km and was discovered in 1999 from ground-based observations.

Subjects: Astronomy and Astrophysics.

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