Stephano (moon)

An Ultradeep Survey for Irregular Satellites of Uranus: Limits to Completeness, The Astronomical Journal, 129 (2005), pages 518–525 . Preprint 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 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. min  mean  max  ~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.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 

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

Related pages
 List of Uranus' moons

 References 

 Ephemeris IAU-NSES
 Mean orbital parameters NASA JPL

 Other websites 
 Stephano Profile  by NASA's Solar System Exploration
 David Jewitt pages
 Scott Sheppard pages

Category:Uranus' moons