Stephano (moon)

Stephano

Discovery image of Stephano (encircled)
Discovery
Discovered by
Discovery date July 18, 1999
Designations
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 (/ˈstɛfənoʊ/ STEF-ə-noh or /stᵻˈfɑːnoʊ/ 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

    References

    1. 1 2 Sheppard, Jewitt & Kleyna 2005, p. 523, Table 3.
    2. 1 2 Yeomans, Donald K. (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 2008-01-19.
    3. 1 2 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
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