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Setebos (moon)

Setebos
Uranus - Setebos image.jpg
Discovery image of Setebos (encircled)
Discovery
Discovered by
Discovery date July 18, 1999
Designations
Adjectives Setebosian
Orbital characteristics
Mean orbit radius
17,418,000 km
Eccentricity 0.5914
2225.21 d
Inclination 158° (to the ecliptic)
Satellite of Uranus
Physical characteristics
Mean radius
24 km (estimate)
~7200 km² (estimate)
Volume ~58,000 km³ (estimate)
Mass ~7.5×1016kg (estimate)
Mean density
~1.3 g/cm³ (assumed)
~0.0204 km/s (estimate)
?
?
Albedo 0.04 (assumed)
Temperature ~65 K (estimate)

Setebos (/ˈsɛtbʌs/ 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.

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. 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), similar to Prospero but different from Sycorax (which is light red).

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


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