Setebos (moon)

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Uranus - Setebos image.jpg
Discovery image of Setebos (encircled)
Discovered by
Discovery dateJuly 18, 1999
Orbital characteristics
Mean orbit radius
17,418,000 km[1][2]
2225.21 d
Inclination158° (to the ecliptic)[1]
Satellite ofUranus
Physical characteristics
Mean radius
24 km (estimate)[3]
~7200 km² (estimate)
Volume~58,000 km³ (estimate)
Mass~7.5×1016 kg (estimate)
Mean density
~1.3 g/cm³ (assumed)
~0.0063 m/s² (estimate)
~0.0204 km/s (estimate)
Albedo0.04 (assumed)[3]
Temperature~65 K (estimate)

Setebos (/ˈsɛtəbʌs/ SET-ə-bus) is one of the outermost retrograde irregular satellites of Uranus. It was discovered on 18 July 1999 by John J. Kavelaars et al. and provisionally designated S/1999 U 1.[4]

Confirmed as Uranus XIX, it is named after the god worshipped by Caliban and Sycorax in William Shakespeare's play The Tempest.

The orbital parameters suggest that it may belong to the same dynamic cluster as Sycorax and Prospero, suggesting common origin.[5] 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=0.77, R-V=0.35),[6] similar to Prospero but different from Sycorax (which is light red).

A crater on Umbriel is also named after Setebos, but with the spelling Setibos.

See also[edit]


  1. ^ a b Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3.
  2. ^ a b Yeomans, Donald K. (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 2008-01-19.
  3. ^ a b Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3 ... ri (km) ... 24 ... i Radius of satellite assuming a geometric albedo of 0.04.
  4. ^ Gladman, B. J.; Kavelaars, J. J.; Holman, M. J., Petit, J.-M.; Scholl, H.; Nicholson, P. D.; and Burns, J. A.; The Discovery of Uranus XIX, XX, and XXI, Icarus, 147 (2000), pp. 320–324
  5. ^ Grav, Tommy; Holman, Matthew J.; Gladman, Brett J.; and Aksnes, Kaare; Photometric survey of the irregular satellites, Icarus, 166, (2003), pp. 33–45. arXiv:astro-ph/0301016
  6. ^ Grav, Holman & Fraser 2004.

External links[edit]