Stephano (moon)

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Stephano - Uranus moon.jpg
Discovery image of Stephano (encircled)
Discovered by
Discovery date July 18, 1999
Adjectives Stephanonian
Orbital characteristics
Mean orbit radius
8,004,000 km[1][2]
Eccentricity 0.2292[2]
677.37 d
Inclination 141.81° (to the ecliptic),144°[1]
Satellite of Uranus
Physical characteristics
Mean radius
16 km (estimate)[3]
~3,000 km2 (estimate)
Volume ~20,000 km3 (estimate)
Mass ~2.2×1016 kg (estimate)
Mean density
~1.3 g/cm3 (assumed)
~0.0041 m/s2 (estimate)
~0.013 km/s (estimate)
Albedo 0.04 (assumed)[3]
Temperature ~65 K (estimate)

Stephano (/ˈstɛfən/ STEF-ə-noh or /stəˈfɑːn/ 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 in August 2000.[9]

The orbital parameters suggest that it may belong to the same dynamic cluster as Caliban, suggesting common origin.[10]

See also


  1. ^ a b Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3.
  2. ^ a b Yeomans, Donald K. (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 2008-01-19. 
  3. ^ a b Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3 ... ri (km) ... 16 ... i Radius of satellite assuming a geometric albedo of 0.04.
  4. ^ 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
  5. ^ Marsden, Brian G.; Probable New Satellites of Uranus, IAUC 7230, 1999 July 27
  6. ^ Marsden, Brian G.; Probable New Satellites of Uranus, IAUC 7248, 1999 September 4
  7. ^ Marsden, Brian G.; S/1999 U 1, S/1999 U 2 and S/1999 U 3, IAUC 7385, 2000 March 24
  8. ^ Marsden, Brian G.; S/1999 U 2, IAUC 7473, 2000 August 5
  9. ^ Marsden, Brian G.; Satellites of Uranus, IAUC 7479, 2000 August 21
  10. ^ 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
  • Sheppard, S. S.; Jewitt, D.; Kleyna, J. (2005). "An Ultradeep Survey for Irregular Satellites of Uranus: Limits to Completeness". The Astronomical Journal. 129: 518. arXiv:astro-ph/0410059Freely accessible. Bibcode:2005AJ....129..518S. doi:10.1086/426329. 

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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