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Juliet (moon)

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Discovered byStephen P. Synnott / Voyager 2
Discovery timeJanuary 3, 1986
Longest distance from the center of its orbital path
("semi-major axis")
64,358.222 ± 0.048 km[1]
How egg-shaped its orbit is
0.00066 ± 0.000087[1]
How long it takes to complete an orbit0.493065490 ± 0.000000012 d[1]
Angle above the reference plane
0.06546 ± 0.040° (to Uranus' equator)[1]
What it orbitsUranus
Size and Other Qualities
Measures150 × 74 × 74 km[2]
Average distance from its center to its surface53 ± 4 km[2]
Area of its surface~35,000 km²[3]
Volume inside it~632,000 km³[3]
Mass~8.2×1017 kg[3]
Average density~1.3 g/cm³ assumed
Gravity at its surface~0.016 m/s2[3]
Slowest speed able to escape into space
("escape velocity")
~0.040 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]
Discovery image of Juliet

Juliet is a closer moon to Uranus. It was found from the images taken by Voyager 2 on 1986-01-03, and was given the designation S/1986 U 2.[5] It is named after the heroine of William Shakespeare's play Romeo and Juliet. It is also designated Uranus XI.[6]

Juliet belongs to Portia Group of moons, which also includes Bianca, Cressida, Desdemona, Portia, Rosalind, Cupid, Belinda and Perdita.[4] These moons have similar orbits and photometric properties.[4] Unfortunately, other than its orbit,[1] radius of 53 km[2] and geometric albedo of 0.08[4] almost nothing is known about it.

At the Voyager 2 images Juliet appears as a stretched object, the major axis pointing towards Uranus. The ratio of axises of the Juliet's prolate spheroid is 0.5 ± 0.3, which is rather an extreme value.[2] Its surface is grey in color.[2]


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