Margaret (moon)

From Wikipedia, the free encyclopedia
Jump to: navigation, search
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)[1]
Is a moon of Uranus
Physical characteristics
Mean diameter ~20 km (estimate)[1]
Surface area ~1300 km2 (estimate)
Volume ~4000 km3 (estimate)
Mass ~1.0×1015 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)[1]
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.[2]

Confirmed as Uranus XXIII, it was named after the servant of Hero in William Shakespeare's play Much Ado About Nothing[3]

Orbit[change | change source]

Irregular satellites of Uranus.

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.

Other pages[change | change source]

References[change | change source]

  1. 1.0 1.1 1.2 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. IAU Circular 8217
  3. Planetary names USGS.
  1. Ephemeris IAU-NSES
  2. Mean orbital parameters NASA JPL

Other websites[change | change source]