Setebos (moon)
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Discovery image of Setebos (encircled)
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Discovery
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| Discovered by | |
| Discovery date | July 18, 1999 |
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Designations
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| Adjective | Setebosian |
| Mean orbit radius | 17,418,000 km[1][2] |
| Eccentricity | 0.5914[2] |
| Orbital period | 2225.21 d |
| Inclination | 158° (to the ecliptic)[3] |
| Satellite of | Uranus |
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Physical characteristics
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| Mean radius | 24 km (estimate)[1] |
| Surface area | ~7200 km² (estimate) |
| Volume | ~58,000 km³ (estimate) |
| Mass | ~7.5×1016 kg (estimate) |
| Mean density | ~1.3 g/cm³ (assumed) |
| Escape velocity | ~0.0204 km/s (estimate) |
| Rotation period | ? |
| Axial tilt | ? |
| Albedo | 0.04 (assumed)[3] |
| Temperature | ~65 K (estimate) |
Setebos (
/ˈsɛtɨbʌs/ 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).
[edit] See also
[edit] References
- ^ a b Sheppard 2005, p. 523
- ^ a b Yeomans, Donald K. (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. http://ssd.jpl.nasa.gov/?sat_elem#uranus. Retrieved 2008-01-19.
- ^ a b Sheppard, Scott S.; Jewitt, David C., Kleyna, Jan (2005). "An Ultradeep Survey for Irregular Satellites of Uranus: Limits to Completeness". The Astronomical Journal 129 (1): 518–525. arXiv:astro-ph/0410059. Bibcode 2004astro.ph.10059S. doi:10.1086/426329. "Table 3 ... ri (km) ... 24 ... i Radius of satellite assuming a geometric albedo of 0.04."
- ^ 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
- ^ 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
- ^ Grav, Tommy; Holman, Matthew J.; Fraser, Wesley C. (2004-09-20). "Photometry of Irregular Satellites of Uranus and Neptune". The Astrophysical Journal 613 (1): L77–L80. arXiv:astro-ph/0405605. Bibcode 2004ApJ...613L..77G. doi:10.1086/424997.
[edit] External links
- Setebos Profile (by NASA's Solar System Exploration)
- David Jewiit pages
- Uranus' Known Satellites (by Scott S. Sheppard)
- MPC: Natural Satellites Ephemeris Service
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