Cressida is an inner satellite of the planet Uranus.
Cressida is the 11th largest Moon of Uranus and the 54th largest moon in the Solar System currently known.
Discovery
Cressida was discovered by Stephen P. Synnott, who is an American astronomer and Voyager scientist, from the images taken by Voyager 2 on 9 January 1986.
Naming
The moon was given the temporary designation S/1986 U3.
Cressida the moon was named after the Trojan daughter of Calchas, a tragic heroine who appears in William Shakespeare's play Troilus and Cressida (as well as in tales by Geoffrey Chaucer and others).
Cressida is a character who appears in many Medieval and Renaissance retellings of the story of the Trojan War. She is a Trojan woman, the daughter of Calchas, a priestly defector to the Greeks. She falls in love with Troilus the youngest son of King Priam, and pledges everlasting love, but when she is sent to the Greeks as part of a hostage exchange, she forms a liaison with the Greek warrior Diomedes.
Stats
Diameter (mean): 79.6 km
Semi-major axis: 61,766 km
Orbital Period: 0.464 days
Orbit
Cressida takes as long to rotate on its axis as it does to make one orbit of Uranus; and therefore always keeps the same hemisphere pointed to Uranus.
Cressida belongs to a group of satellites called the Portia Group, which includes Portia, Bianca, Belinda, Desdemona, Rosalind, Cupid, Juliet and Perdita. These satellites have similar orbits and photometric properties.
Cressida may collide with Desdemona within the next 100 million years.
Physical characteristics
Little is known about Cressida beyond its size of about 80 km, orbit and geometric albedo of about 0.08.
The Voyager 2 images show Cressida as an elongated object with its major axis pointing towards Uranus. The ratio of axes of the Cressida's prolate spheroid is 0.8 ± 0.3. Cressida's surface is grey in color.
Exploration Status
No close-up image of Cressida has been photographed.
No mission is planned in the foreseeable future.
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