Astronomy:Stephano (moon)

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Short description: Moon of Uranus
Stephano
Discovery image of Stephano (encircled)
Discovery
Discovered by
Discovery dateJuly 18, 1999
Designations
Designation
Uranus XX
Pronunciation/ˈstɛfənoʊ/ STEF-ən-oh[1][2]
AdjectivesStephanonian /ˌstɛfəˈnoʊniən/ STEF-ə-NOH-nee-ən[3]
Orbital characteristics
Mean orbit radius8,004,000 km[4][5]
Eccentricity0.2292[5]
Orbital period677.37 d
Inclination141.81° (to the ecliptic),144°[4]
Satellite ofUranus
Physical characteristics
Mean radius16 km (estimate)[6]
Surface area~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)
Rotation period?
Axial tilt?
Albedo0.04 (assumed)[6]
Physics~65 K (estimate)


Stephano (/ˈstɛfənoʊ/ STEF-ən-oh) 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.[7][8][9][10][11]

Confirmed as Uranus XX, it was named after the drunken butler in William Shakespeare's play The Tempest in August 2000.[12]

The orbital parameters suggest that it may belong to the same dynamic cluster as Caliban, suggesting common origin.[13]

Animation of Stephano's orbit around Uranus.
   Uranus  ·    Sycorax ·    Francisco  ·    Caliban  ·    Stephano  ·    Trinculo
Animation of discovery images taken by the CFHT in July 1999

See also

  • Uranus' natural satellites
  • Irregular satellites

References

  1. ↑ Shakespeare Recording Society (1995) The Tempest (audio CD)
  2. ↑ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
  3. ↑ Lessing (1914) How the Ancients Represented Death
  4. ↑ 4.0 4.1 Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3.
  5. ↑ 5.0 5.1 Yeomans, Donald K. (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. http://ssd.jpl.nasa.gov/?sat_elem#uranus. 
  6. ↑ 6.0 6.1 Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3 ... ri (km) ... 16 ... i Radius of satellite assuming a geometric albedo of 0.04.
  7. ↑ 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
  8. ↑ Marsden, Brian G.; Probable New Satellites of Uranus, IAUC 7230, 1999 July 27
  9. ↑ Marsden, Brian G.; Probable New Satellites of Uranus, IAUC 7248, 1999 September 4
  10. ↑ Marsden, Brian G.; S/1999 U 1, S/1999 U 2 and S/1999 U 3, IAUC 7385, 2000 March 24
  11. ↑ Marsden, Brian G.; S/1999 U 2, IAUC 7473, 2000 August 5
  12. ↑ Marsden, Brian G.; Satellites of Uranus, IAUC 7479, 2000 August 21
  13. ↑ 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 (1): 518–525. doi:10.1086/426329. Bibcode: 2005AJ....129..518S. 



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