Cressida (moon)
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Cressida Template:IPAc-en is an inner satellite of Uranus. It was discovered from the images taken by Voyager 2 on 9 January 1986, and was given the temporary designation S/1986 U 3.[1] It was named after Cressida, 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). It is also designated Uranus IX.[2]
Cressida belongs to the Portia group of satellites, which includes Bianca, Desdemona, Juliet, Portia, Rosalind, Cupid, Belinda, and Perdita.[3] These satellites have similar orbits and photometric properties.[3] Other than its orbit,[4] size of Template:Cvt,[5] and geometric albedo of 0.08,[3] little is known about it.
In Voyager 2 imagery Cressida appears as an elongated object, with its major axis pointing towards Uranus. The ratio of axes of Cressida's prolate spheroid is 0.8 ± 0.3.[5] Its surface is grey in color.[5]
Cressida orbits close to a 3:2 resonance with the η ring, one of the rings of Uranus. Perturbations of the ring's shape provide a way to measure the mass of Cressida, which in 2024 was found to be Script error: No such module "val"..[6] Cressida is one of the few small satellites of Uranus for which the mass has been directly measured.[6][7]
Cressida may collide with Desdemona within the next 100 million years.[8]
See also
Notes
References
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External links
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