Stephano (moon)

Stephano
Discovery
Discovered by Brett J. Gladman,
Matthew J. Holman,
John J. Kavelaars,
Jean-Marc Petit,
and Hans Scholl
Discovered in July 18, 1999
Orbital characteristics
Mean radius 8,004,000 km
Eccentricity 0.2295
Orbital period 677.37 d
Inclination 141.81° (to the ecliptic)144°)
Is a moon of Uranus
Physical characteristics
Mean diameter ~32 km (estimate)
Surface area ~3000 km² (estimate)
Volume ~20,000 km3 (estimate)
Mass ~6.0×1015 kg (estimate)
Mean density ~1.5 g/cm3 (estimate)
Surface gravity ~0.0041 m/s2 (estimate)
Escape velocity ~0.0090 km/s (estimate)
Rotation period ?
Axial tilt ?°
Albedo 0.04 (assumed)
Surface temp.
minmeanmax
~64 K (estimate)
Atmospheric pressure 0 kPa

Stephano is a retrograde non-spherical moon of Uranus. It was found by Brett J. Gladman, et al. in 1999, and given the designation S/1999 U 2.

Confirmed as Uranus XX, it is named after the drunken butler in William Shakespeare's play The Tempest.

References

  1. 1 2 3 Scott S. Sheppard, David C. Jewitt, and Jan Kleyna An Ultradeep Survey for Irregular Satellites of Uranus: Limits to Completeness, The Astronomical Journal, 129 (2005), pages 518–525 . Preprint
  2. ↑ B. Gladman, JJ Kavelaars, Matthew J. Holman, J-M. Petit, H. Scholl, P. Nicholson, J. A. Burnse The Discovery of Uranus XIX, XX, and XXI, Icarus, 147 (2000), pp. 320–324
  2. Ephemeris IAU-NSES
  3. Mean orbital parameters NASA JPL

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