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Uranus XVIII

Proper NameProspero
DesignationUranus XVIII
Primary PlanetUranus
Orbital Period5 years, 152 days
Distance from UranusSemi-Major Axis: 16,276,800 km
Periapsis: 9,036,900 km
Apoapsis: 23,516,700 km
Rotation PeriodNot known
Mean Diameterc.50 km
NotesProspero, named for the magician at the centre of Shakespeare's The Tempest, is a small retrogade satellite of Uranus (that is, it follows its orbital path in the opposite direction to Uranus' rotation, suggesting that it was captured by the ice giant planet after it had formed).


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