Margaret
Satellite
Margaret is the only known prograde irregular satellite of the moons of Uranus. It was discovered by Scott S. Sheppard, et al. in 2003 and given the provisional designation S/2003 U 3.
Confirmed as Uranus XXIII, it was named after the servant of... Wikipedia
Orbital period: 1,687 days
Discovered: August 29, 2003
Discoverers: David C. Jewitt and Scott S. Sheppard
Escape velocity: ~0.0085 km/s (estimate)
Mass: ~5.5×1015 kg (estimate)
Orbital period (sidereal): 1687.01 d
Satellite of: Uranus