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Bianca (moon)

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Discovered byBradford A. Smith / Voyager 2
Discovery timeJanuary 23, 1986
Avgdistance from the center of its orbital path59,165.550 ± 0.045 km[1]
How egg-shaped its orbit is
0.00092 ± 0.000118[1]
How long it takes to complete an orbit0.434578986 ± 0.000000022 d[1]
Angle above the reference plane
0.19308 ± 0.054° (to Uranus' equator)[1]
What it orbitsUranus
Size and Other Qualities
Measures64 × 46 × 46 km[2]
Average distance from its center to its surface27 ± 2 km[2]
Area of its surface~8300 km²[3]
Volume inside it~71,000 km³[3]
Mass~9.2×1016 kg[3]
Average density~1.3 g/cm³ (assumed)
Gravity at its surface~0.0086 m/s2[3]
Slowest speed able to escape into space
("escape velocity")
~0.022 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]
Bianca orbiting Uranus

Bianca is a closer moon to Uranus. It was found from the images taken by Voyager 2 on 1986-01-23, and was given the designation S/1986 U 9.[5] It was named after the sister of Katherine in Shakespeare's play The Taming of the Shrew. It is also designated Uranus VIII.[6]

Bianca belongs to Portia Group of moons, which also includes Cressida, Desdemona, Juliet, Portia, Rosalind, Cupid, Belinda and Perdita.[4] These moons have similar orbits and photometric properties.[4] Other than its orbit,[1] radius of 27 km[2] and geometric albedo of 0.08[4] almost nothing is known about it.

At the Voyager 2 images Bianca appears as a stretched object, the major axis pointing towards Uranus. The ratio of axises of the Bianca's prolate spheroid is 0.7 ± 0.2.[2] Its surface is grey in color.[2]


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