Stephano (moon)
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| Discovery | |||||||
|---|---|---|---|---|---|---|---|
| Discovered by | Brett J. Gladman, Matthew J. Holman, John J. Kavelaars, Jean-Marc Petit, and Hans Scholl |
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| Discovered in | July 18, 1999 | ||||||
| Orbital characteristics | |||||||
| Mean radius | 8,004,000 km[1] | ||||||
| Eccentricity | 0.2292 | ||||||
| Orbital period | 677.37 d | ||||||
| Inclination | 141.81° (to the ecliptic)144°)[2] | ||||||
| Is a satellite of | Uranus | ||||||
| Physical characteristics | |||||||
| Mean diameter | ~32 km (estimate)[2] | ||||||
| Surface area | ~3000 km² (estimate) | ||||||
| Volume | ~20,000 km3 (estimate) | ||||||
| Mass | ~2.2×1016 kg (estimate) | ||||||
| Mean density | ~1.3 g/cm3 (assumed) | ||||||
| Surface gravity | ~0.0041 m/s2 (estimate) | ||||||
| Escape velocity | ~0.013 km/s (estimate) | ||||||
| Rotation period | ? | ||||||
| Axial tilt | ?° | ||||||
| Albedo | 0.04 (assumed)[2] | ||||||
| Surface temp. |
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| Atmospheric pressure | 0 kPa | ||||||
Stephano (stef'-ə-noe, IPA: /ˈstɛfənɔʊ/, or stə-faa'-noe, /stɨˈfɑnɔʊ/) is a retrograde irregular satellite of Uranus. It was discovered by Brett J. Gladman, et al. in 1999, and given the provisional designation S/1999 U 2.[3]
Confirmed as Uranus XX, it is named after the drunken butler in William Shakespeare's play The Tempest.
The orbital parameters suggest that it may belong, together with Caliban to the same dynamic cluster, suggesting common origin.[4]
[edit] See also
[edit] References
- ^ Jacobson, R.A. (2003) URA066 (2007-Jun-28). Planetary Satellite Mean Orbital Parameters. JPL/NASA. Retrieved on 2008-01-23.
- ^ a b c Scott S. Sheppard, David C. Jewitt, and Jan Kleyna An Ultradeep Survey for Irregular Satellites of Uranus: Limits to Completeness, The Astronomical Journal, 129 (2005), pages 518–525 . Preprint
- ^ B. Gladman, JJ Kavelaars, Matthew J. Holman, J-M. Petit, H. Scholl, P. Nicholson, J. A. Burnse The Discovery of Uranus XIX, XX, and XXI, Icarus, 147 (2000), pp. 320–324
- ^ Grav, Tommy; Holman, Matthew J.; Gladman, Brett J.; Aksnes, Kaare Photometric survey of the irregular satellites,Icarus, 166 (2003), pp. 33-45. Preprint
[edit] External links
- Stephano Profile by NASA's Solar System Exploration
- David Jewitt pages
- Uranus' Known Satellites (by Scott S. Sheppard)
- Ephemeris IAU-NSES
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