Margaret (moon)
Discovery image of Margaret taken by the Subaru Telescope in August 2003 | |
| Discovery | |
|---|---|
| Discovered by | |
| Discovery date | August 29, 2003 |
| Designations | |
Designation | Uranus XXIII |
| Pronunciation | /ˈmɑːrɡərət/ |
| Adjectives | Margaretian /ˌmɑːrɡəˈrɛtiən/ |
| Orbital characteristics | |
Mean orbit radius | 14,345,000 km |
| Eccentricity | 0.6608 (mean) |
| 1687.01 d | |
| Inclination | 57° (to the ecliptic) |
| Satellite of | Uranus |
| Physical characteristics | |
| 10 km (estimate) | |
| ~1,300 km2 (estimate) | |
| Volume | ~4,200 km3 (estimate) |
| Mass | ~5.5×1015 kg (estimate) |
Mean density | ~1.3 g/cm3 (assumed) |
| ~0.0023 m/s2 (estimate) | |
| ~0.0085 km/s (estimate) | |
| ? | |
| ? | |
| Albedo | 0.04 (assumed) |
| Temperature | ~65 K (estimate) |
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 Hero in William Shakespeare's play Much Ado About Nothing. The name was also chosen to match the name of Sheppard's mother.