Discovered by            W. Lassell
Date of Discovery        1851
Distance from Uranus     266,300 km
Radius                   584.7 km
Mass                     1.17 × 10^24 g
Orbital Eccentricity     0.0050
Orbital Inclination      0.36°
Orbital Period           4.1441772 days
Rotational Period        Synchronous
Density (gm/cm3)         ???

Similar to Ariel in size, density and shape, this darker moon has a uniform, cratered surface whereas Ariel's surface is more eclectic. Its surface is relatively dark, the darkest of Uranus's satellites, except for a bright ring at the 'north pole' that was first observed by Voyager 2. The nature and cause of this ring are unknown, but it may be floor of a crater. It is called the florescent cheerio.


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