Stephano (moon)
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Discovery image of Stephano (encircled)
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Discovery
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| Discovered by | John J. Kavelaars, Brett J. Gladman, Matthew J. Holman, Jean-Marc Petit, and Hans Scholl |
| Discovery date | July 18, 1999 |
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Designations
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| Adjective | Stephanonian |
| Mean orbit radius | 8,004,000 km[1][2] |
| Eccentricity | 0.2292[2] |
| Orbital period | 677.37 d |
| Inclination | 141.81° (to the ecliptic),144°[3] |
| Satellite of | Uranus |
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Physical characteristics
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| Mean radius | 16 km (estimate)[3] |
| Surface area | ~3,000 km2 (estimate) |
| Volume | ~20,000 km3 (estimate) |
| Mass | ~2.2×1016 kg (estimate) |
| Mean density | ~1.3 g/cm3 (assumed) |
| Equatorial surface gravity | ~0.0041 m/s2 (estimate) |
| Escape velocity | ~0.013 km/s (estimate) |
| Rotation period | ? |
| Axial tilt | ? |
| Albedo | 0.04 (assumed)[3] |
| Temperature | ~65 K (estimate) |
Stephano (
/ˈstɛfənoʊ/ STEF-ə-noh or /stɨˈfɑːnoʊ/ stə-FAH-noh) 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.[4][5][6][7][8]
Confirmed as Uranus XX, it was named after the drunken butler in William Shakespeare's play The Tempest on 2000 August.[9]
The orbital parameters suggest that it may belong to the same dynamic cluster as Caliban, suggesting common origin.[10]
[edit] See also
[edit] References
- ^ 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 c 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) ... 16 ... 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
- ^ Marsden, Brian G.; Probable New Satellites of Uranus, IAUC 7230, 1999 July 27
- ^ Marsden, Brian G.; Probable New Satellites of Uranus, IAUC 7248, 1999 September 4
- ^ Marsden, Brian G.; S/1999 U 1, S/1999 U 2 and S/1999 U 3, IAUC 7385, 2000 March 24
- ^ Marsden, Brian G.; S/1999 U 2, IAUC 7473, 2000 August 5
- ^ Marsden, Brian G.; Satellites of Uranus, IAUC 7479, 2000 August 21
- ^ 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
[edit] External links
- Stephano Profile by NASA's Solar System Exploration
- David Jewitt pages
- Uranus' Known Satellites (by Scott S. Sheppard)
- MPC: Natural Satellites Ephemeris Service
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