Margaret (moon)
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]
| 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. |
| ||||||
| Atmospheric pressure | 0 kPa | ||||||
Confirmed as Uranus XXIII, it was named after the servant of Hero in William Shakespeare's play Much Ado About Nothing[3]
Orbit
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.
References
- 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
- IAU Circular 8217
- Planetary names USGS.
Other websites
- Margaret Profile Archived 2015-06-10 at the Wayback Machine by NASA's Solar System Exploration
- David Jewitt pages
- Scott Sheppard pages
| Moons | Ariel · Belinda · Bianca · Caliban · Cordelia · Cressida · Cupid · Desdemona · Ferdinand · Francisco · Juliet · Mab · Margaret · Miranda · Oberon · Ophelia · Perdita · Portia · Prospero · Puck · Rosalind · Setebos · Stephano · Sycorax · Titania · Trinculo · Umbriel Other: Arieal features · Miranda features · Puck Craters · Umbriel craters Miranda's Verona Rupes · Umbriel Crater Wunda |  |
|---|---|---|
| Characteristics | ||
| Discovery | ||
| Exploration | ||
| Other | ||
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