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Prospero (moon) facts for kids

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Prospero discovery image
Discovery image of Prospero.
Discovered by
  • John J. Kavelaars
  • Brett J. Gladman
  • Matthew J. Holman
  • Jean-Marc Petit
  • Hans Scholl
Discovery date 18 July 1999
Adjectives Prosperonian, Prosperian
Orbital characteristics
Mean orbit radius
16,256,000 km
Eccentricity 0.4448
1978.29 d
Inclination 152° (to the ecliptic)
Satellite of Uranus
Physical characteristics
Mean radius
25 km (estimate)
~8000 km² (estimate)
Volume ~65,000 km³ (estimate)
Mass ~8.5×1016 kg (estimate)
Mean density
~1.3 g/cm³ (assumed)
~0.0063 m/s² (estimate)
~0.021 km/s (estimate)
Albedo 0.04 (assumed)
Temperature ~65 K (estimate)

Prospero is a small retrograde non-spherical moon of Uranus found on 1999-07-18 by the astrophysicist Matthew Holman and his team, and given designation S/1999 U 3. Confirmed as Uranus XVIII it was named after the sorcerer Prospero in William Shakespeare's play The Tempest.

The orbital parameters suggest that it may belong, together with Sycorax and Setebos to the same dynamic cluster, suggesting common origin. However, this suggestion does not appear to be supported by the observed colours. The moon appears grey in the visible light , similar to Setebos but different from Sycorax (which is light red).

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