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Rosalind (moon)

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Discovered byStephen P. Synnott / Voyager 2
Discovery timeJanuary 13, 1986
Avgdistance from the center of its orbital path69,926.795 ± 0.053 km[1]
How egg-shaped its orbit is
0.00011 ± 0.000103[1]
How long it takes to complete an orbit0.558459529 ± 0.000000019 d[1]
Angle above the reference plane
0.27876 ± 0.045° (to Uranus' equator)[1]
What it orbitsUranus
Size and Other Qualities
Measures72 × 72 × 72 km[2]
Average distance from its center to its surface36 ± 6 km[2]
Area of its surface~16,000 km²[3]
Volume inside it~200,000 km³[3]
Mass~2.5×1017 kg[3]
Average density~1.3 g/cm³ assumed
Gravity at its surface~0.012 m/s2[3]
Slowest speed able to escape into space
("escape velocity")
~0.031 km/s[3]
How long it takes to turn around one timesynchronous[2]
Angle at which it turns
(in relation to its orbit)
How much light it reflects0.08 ± 0.01[4]
Avg. surface temp.~64 K[3]

Rosalind is a closer moon to Uranus. It was found from the images taken by Voyager 2 on January 13, 1986, and was given the designation S/1986 U 4.[5] It was named after the daughter of the banished Duke in William Shakespeare's play As You Like It. It is also designated Uranus XIII.[6]

Rosalind belongs to Portia Group of moons, which also includes Bianca, Cressida, Desdemona, Portia, Juliet, Cupid, Belinda and Perdita.[4] These moons have similar orbits and photometric properties.[4] Unfortunately, other than its orbit,[1] radius of 36 km[2] and geometric albedo of 0.08[4] almost nothing is known about it.

At the Voyager 2 images Rosalind appears as an almost spherical object. The ratio of axises of the Rosalind's prolate spheroid is 1.0-0.8.[2] Its surface is grey in color.[2]


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