Cressida (moon)

In today's article we will talk about Cressida (moon), a topic that has captivated the attention of many people over the years. From its origins to the present, Cressida (moon) has been the subject of debate, discussion and analysis in various areas. Its relevance and impact on society position it as a topic of general interest, whether due to its influence on popular culture, science, politics or any other field. Throughout the article we will explore different aspects related to Cressida (moon), with the aim of offering a broad and complete vision of this topic.

There is also an asteroid called 548 Kressida.
Cressida
Enhanced Voyager 2 image of Cressida
Discovery
Discovered byStephen P. Synnott / Voyager 2
Discovery dateJanuary 9, 1986
Designations
Designation
Uranus IX
Pronunciation/ˈkrɛsədə/
Named after
Χρησίδα
AdjectivesCressidian /krɛˈsɪdiən/
Orbital characteristics
61,766.730 ± 0.046 km
Eccentricity0.00036 ± 0.00011
0.463569601 ± 0.000000013 d
Inclination0.006 ± 0.040° (to Uranus' equator)
Satellite ofUranus
Physical characteristics
Dimensions92 × 74 × 74 km[note 1]
~20000 km2
Volume263800±38.0% km3
Mass(1.839±0.212)×1017 kg
Mean density
0.70+0.44
−0.21 g/cm3
~0.006–0.009 m/s2
~0.023–0.026 km/s
synchronous
zero
Albedo0.08±0.005
0.07
Temperature~65 K
  1. ^ Only two dimensions are known; the third dimension has been assumed to equal the smaller known dimension.

Cressida /ˈkrɛsədə/ 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, size of 92 × 74 km and geometric albedo of 0.08, virtually nothing is known about it.

In the Voyager 2 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 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 (1.839±0.212)×1017 kg. Cressida is one of the few small satellites of Uranus for which the mass has been directly measured.

Cressida may collide with Desdemona within the next 100 million years.

See also

Notes

  1. ^ a b c d Calculated on the basis of other parameters.

References

  1. ^ Benjamin Smith (1903). The Century Dictionary and Cyclopedia.
  2. ^ Kellog (1995). Boccaccio's and Chaucer's Cressida.
  3. ^ a b Jacobson, R. A. (1998). "The Orbits of the Inner Uranian Satellites From Hubble Space Telescope and Voyager 2 Observations". The Astronomical Journal. 115 (3): 1195–1199. Bibcode:1998AJ....115.1195J. doi:10.1086/300263. S2CID 118616209.
  4. ^ a b c d e f Karkoschka, Erich (2001). "Voyager's Eleventh Discovery of a Satellite of Uranus and Photometry and the First Size Measurements of Nine Satellites". Icarus. 151 (1): 69–77. Bibcode:2001Icar..151...69K. doi:10.1006/icar.2001.6597.
  5. ^ a b c d e French, Richard G.; Hedman, Matthew M.; Nicholson, Philip D.; Longaretti, Pierre-Yves; McGhee-French, Colleen A. (2024-03-15). "The Uranus system from occultation observations (1977–2006): Rings, pole direction, gravity field, and masses of Cressida, Cordelia, and Ophelia". Icarus. 411: 115957. arXiv:2401.04634. doi:10.1016/j.icarus.2024.115957. ISSN 0019-1035.
  6. ^ a b c d Karkoschka, Erich (2001). "Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope". Icarus. 151 (1): 51–68. Bibcode:2001Icar..151...51K. doi:10.1006/icar.2001.6596.
  7. ^ Williams, Dr. David R. (23 November 2007). "Uranian Satellite Fact Sheet". NASA (National Space Science Data Center). Retrieved 12 December 2008.
  8. ^ Smith, B. A. (January 16, 1986). "Satellites of Uranus". IAU Circular. 4164. Retrieved 29 October 2011.
  9. ^ "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. Retrieved 6 August 2006.
  10. ^ Chancia, Robert. A.; Hedman, Matthew M.; French, Richard G. (28 August 2017). "Weighing Uranus' moon Cressida with the η ring". The Astronomical Journal. 154 (4): 153. arXiv:1708.07566. Bibcode:2017AJ....154..153C. doi:10.3847/1538-3881/aa880e. S2CID 54827255.
  11. ^ Duncan, Martin J.; Lissauer, Jack J. (1997). "Orbital Stability of the Uranian Satellite System". Icarus. 125 (1): 1–12. Bibcode:1997Icar..125....1D. doi:10.1006/icar.1996.5568.

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