| Proper Name | Prospero | | Designation | Uranus XVIII | | Primary Planet | Uranus | | Orbital Period | 5 years, 152 days | | Distance from Uranus | Semi-Major Axis: 16,276,800 km
Periapsis: 9,036,900 km
Apoapsis: 23,516,700 km | | Eccentricity | 0.4448 | | Rotation Period | Not known | | Mean Diameter | c.50 km | | Notes | Prospero, 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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