: ''There is also an

asteroid An asteroid is a minor planet of the inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic or icy bodies with no atmosphere. ...

called 548 Kressida.'' Cressida is an inner satellite of

Uranus Uranus is the seventh planet from the Sun. Its name is a reference to the Greek god of the sky, Uranus ( Caelus), who, according to Greek mythology, was the great-grandfather of Ares (Mars), grandfather of Zeus (Jupiter) and father of ...

. It was discovered from the images taken by ''

Voyager 2 ''Voyager 2'' is a space probe launched by NASA on August 20, 1977, to study the outer planets and interstellar space beyond the Sun's heliosphere. As a part of the Voyager program, it was launched 16 days before its twin, '' Voyager 1'', ...

'' on 9 January 1986, and was given the temporary designation S/1986 U 3. It was named after Cressida, the

Trojan Trojan or Trojans may refer to: * Of or from the ancient city of Troy * Trojan language, the language of the historical Trojans Arts and entertainment Music * ''Les Troyens'' ('The Trojans'), an opera by Berlioz, premiered part 1863, part 189 ...

daughter of Calchas, a

tragic heroine A tragic hero is the protagonist of a tragedy. In his '' Poetics'', Aristotle records the descriptions of the tragic hero to the playwright and strictly defines the place that the tragic hero must play and the kind of man he must be. Aristotle ...

who appears in

William Shakespeare William Shakespeare ( 26 April 1564 – 23 April 1616) was an English playwright, poet and actor. He is widely regarded as the greatest writer in the English language and the world's pre-eminent dramatist. He is often called England's nation ...

's play ''

Troilus and Cressida ''Troilus and Cressida'' ( or ) is a play by William Shakespeare, probably written in 1602. At Troy during the Trojan War, Troilus and Cressida begin a love affair. Cressida is forced to leave Troy to join her father in the Greek camp. Me ...

'' (as well as in tales by

Geoffrey Chaucer Geoffrey Chaucer (; – 25 October 1400) was an English poet, author, and civil servant best known for '' The Canterbury Tales''. He has been called the "father of English literature", or, alternatively, the "father of English poetry". He w ...

and others). It is also designated Uranus IX. Cressida belongs to the Portia group of satellites, which includes Bianca,

Desdemona Desdemona () is a character in William Shakespeare's play ''Othello'' (c. 1601–1604). Shakespeare's Desdemona is a Venetian beauty who enrages and disappoints her father, a Venetian senator, when she elopes with Othello, a Moorish Venetian ...

Juliet Juliet Capulet () is the female protagonist in William Shakespeare's romantic tragedy ''Romeo and Juliet''. A 13-year-old girl, Juliet is the only daughter of the patriarch of the House of Capulet. She falls in love with the male protagonist ...

Portia Portia may refer to: Biology * ''Portia'' (spider), a genus of jumping spiders *'' Anaea troglodyta'' or Portia, a brush-footed butterfly *Portia tree, a plant native to Polynesia Medication A form of birth control made of ethinylestradiol/lev ...

, Rosalind,

Cupid In classical mythology, Cupid (Latin Cupīdō , meaning "passionate desire") is the god of desire, lust, erotic love, attraction and affection. He is often portrayed as the son of the love goddess Venus (mythology), Venus and the god of war Mar ...

, 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. In the

images Cressida appears as an elongated object, its major axis pointing towards Uranus. The ratio of axes of Cressida's prolate spheroid is 0.8 ± 0.3. Its surface is grey in color. Cressida orbits close to a 3:2

resonance Resonance describes the phenomenon of increased amplitude that occurs when the frequency of an applied periodic force (or a Fourier component of it) is equal or close to a natural frequency of the system on which it acts. When an oscil ...

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 was found to be 2.5±0.4 kg. Cressida is the only small satellite of Uranus for which the mass has been directly measured. Cressida may collide with

within the next 100 million years.

References

Explanatory notes Citations

External links

Cressida Profile
b
NASA's Solar System Exploration

(by Scott S. Sheppard) {{DEFAULTSORT:Cressida (Moon) Moons of Uranus 19860109 Troilus and Cressida Moons with a prograde orbit

See also

References

External links