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Prospero (moon)

Prospero discovery image.gif
Discovery image of Prospero.
Discovered by
Discovery date18 July 1999
AdjectivesProsperonian, Prosperian
Orbital characteristics
Mean orbit radius
16,256,000 km[1][2]
1978.29 d
Inclination152°[1] (to the ecliptic)[1]
Satellite ofUranus
Physical characteristics
Mean radius
25 km (estimate)[3]
~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)
Albedo0.04 (assumed)[3]
Temperature~65 K (estimate)

Prospero (/ˈprɒspər/ PROS-pər-oh) is a relatively small retrograde irregular satellite of Uranus discovered on 18 July 1999 by the astrophysicist Matthew Holman and his team, and given the provisional 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 to the same dynamic cluster as Sycorax and Setebos, suggesting common origin.[4] However, this suggestion does not appear to be supported by the observed colours. The satellite appears neutral (grey) in visible light (colour indices B-V=0.80, R-V=0.39),[5] similar to Setebos but different from Sycorax (which is light red).

See also


  1. ^ a b c Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3.
  2. ^ a b Yeomans, Donald K. (28 June 2007). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 19 January 2008.
  3. ^ a b Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3 ... ri (km) ... 25 ... i Radius of satellite assuming a geometric albedo of 0.04.
  4. ^ Grav, Tommy; Holman, Matthew J.; Gladman, Brett J.; Aksnes, Kaare Photometric survey of the irregular satellites, Icarus, 166, (2003), pp. 33–45. arXiv:astro-ph/0301016
  5. ^ Grav, Holman & Fraser 2004.

External links