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: ''There is also an asteroid called 548 Kressida.'' Cressida ( , (ギリシア語:Χρησίδα)) 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.〔 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.〔 Cressida belongs to the Portia Group of satellites, which includes Bianca, Desdemona, Juliet, Portia, Rosalind, Cupid, Belinda and Perdita.〔 These satellites have similar orbits and photometric properties.〔 Other than its orbit,〔 radius of 41 km〔 and geometric albedo of 0.08〔 virtually nothing is known about it. At the Voyager 2 images Cressida appears as an elongated object, the major axis pointing towards Uranus. The ratio of axes of the Cressida's prolate spheroid is 0.8 ± 0.3.〔 Its surface is grey in color.〔 Cressida may collide with Desdemona within the next 100 million years.〔 == See also == * Moons of Uranus 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cressida (moon)」の詳細全文を読む スポンサード リンク
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