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Setebos is one of the outermost retrograde
irregular satellite In astronomy, an irregular moon, irregular satellite or irregular natural satellite is a natural satellite following a distant, inclined, and often eccentric and retrograde orbit. They have been captured by their parent planet, unlike regular s ...
s of
Uranus Uranus is the seventh planet from the Sun. Its name is a reference to the Greek god of the sky, Uranus ( Caelus), who, according to Greek mythology, was the great-grandfather of Ares (Mars), grandfather of Zeus (Jupiter) and father of ...
. 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 Caliban ( ), son of the witch Sycorax, is an important character in William Shakespeare's play '' The Tempest''. His character is one of the few Shakespearean figures to take on a life of its own "outside" Shakespeare's own work: as Russell H ...
and Sycorax in
William Shakespeare William Shakespeare ( 26 April 1564 – 23 April 1616) was an English playwright, poet and actor. He is widely regarded as the greatest writer in the English language and the world's pre-eminent dramatist. He is often called England's nation ...
's play '' The Tempest''. The orbital parameters suggest that it may belong to the same dynamic cluster as Sycorax and
Prospero Prospero ( ) is a fictional character and the protagonist of William Shakespeare's play '' The Tempest''. Prospero is the rightful Duke of Milan, whose usurping brother, Antonio, had put him (with his three-year-old daughter, Miranda) to se ...
, suggesting common origin. However, this suggestion does not appear to be supported by the observed colours. The satellite appears neutral (grey) in
visible light Light or visible light is electromagnetic radiation that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 te ...
( colour indices B-V=0.77, R-V=0.35), 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

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Moons of Uranus Uranus, the seventh planet of the Solar System, has 27 known moons, most of which are named after characters that appear in, or are mentioned in, the works of William Shakespeare and Alexander Pope. Uranus's moons are divided into three groups: t ...
*
Irregular satellite In astronomy, an irregular moon, irregular satellite or irregular natural satellite is a natural satellite following a distant, inclined, and often eccentric and retrograde orbit. They have been captured by their parent planet, unlike regular s ...
s


References

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External links


Setebos Profile
(b
NASA's Solar System Exploration




(by
Scott S. Sheppard Scott Sander Sheppard (born 1977) is an American astronomer and a discoverer of numerous moons, comets and minor planets in the outer Solar System. He is an astronomer in the Department of Terrestrial Magnetism at the Carnegie Institution for Scie ...
)
MPC: Natural Satellites Ephemeris Service
{{DEFAULTSORT:Setebos (Moon) Moons of Uranus Irregular satellites 19990718 Moons with a retrograde orbit