Margaret (moon)

+ Margaret Discovery Discovered by Scott S. Sheppard,and David C. Jewitt Discovered in August 29, 2003 Orbital characteristics Mean radius 14,345,000 km Eccentricity 0.6608 Orbital period 1687.01 d Inclination 57° (to the ecliptic)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 Is a moon of Uranus Physical characteristics Mean diameter ~20 km (estimate) Surface area ~1300 km2 (estimate) Volume ~4000 km3 (estimate) Mass ~1.0 kg (estimate) Mean density ~1.5 g/cm3 (estimate) Surface gravity ~0.0023 m/s2 (estimate) Escape velocity ~0.005 km/s (estimate) Rotation period ? Axial tilt ?° Albedo 0.04 (assumed) Surface temp. min  mean  max  ~65 K (estimate)  Atmospheric pressure 0 kPa
Margaret is the only prograde non-spherical moon of Uranus.  It was found by Scott S. Sheppard, et al. in 2003 and given the designation S/2003 U 3.IAU Circular  8217

Confirmed as Uranus XXIII, it was named after the servant of Hero in William Shakespeare's play Much Ado About NothingPlanetary names USGS. 

Orbit
Margaret stands out as the only prograde non-spherical moon of Uranus. The diagram illustrates the orbital parameters of Margaret, unique  among the non-spherical moons of Uranus, with inclination on the vertical axis and the eccentricity of the orbits represented by the segments extending from the pericentre to the apocentre.

Related pages
List of Uranus' moons
https//ifarley.net

References

 Ephemeris: IAU-NSES
 Mean orbital parameters: NASA JPL

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

Category:Uranus' moons