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Stephano (moon)

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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[4]
Mean orbit radius
7 951 400 km
Eccentricity0.235
677 d
Inclination143.6° (to the ecliptic)
Satellite ofUranus
GroupCaliban group
Physical characteristics
16 km (estimate)[5]
~3200 km2 (estimate)
Volume~17 000 km3 (estimate)
Mass~2.2×1016 kg (estimate)
Mean density
~1.3 g/cm3 (assumed)
~0.006 m/s2 (estimate)
~0.014 km/s (estimate)
?
?
Albedo0.04 (assumed)[5]
Temperature~65 K (estimate)
Spectral type
B–V = 0.97 ± 0.07, V–R = 0.66 ± 0.05[6]

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 several irregular moons' orbits around Uranus, including that of Stephano's.
   Uranus  ·    Sycorax ·    Francisco  ·    Caliban  ·    Stephano  ·    Trinculo
Animation of discovery images taken by the CFHT in July 1999

See also

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References

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  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. ^ "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 2024-10-28.
  5. ^ a b Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3 ... ri (km) ... 16 ... i Radius of satellite assuming a geometric albedo of 0.04.
  6. ^ Graykowski, Ariel; Jewitt, David (2018-04-05). "Colors and Shapes of the Irregular Planetary Satellites". The Astronomical Journal. 155 (4): 184. arXiv:1803.01907. doi:10.3847/1538-3881/aab49b. ISSN 1538-3881.
  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
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