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Cordelia (moon)

From Wikipedia, the free encyclopedia
Moon of Uranus
Cordelia
Cordelia (bottom),Ophelia (top), andUranus's narrow rings photographed from afar byVoyager 2 on 21 January 1986
Discovery[1]
Discovered byRichard J. Terrile /Voyager 2
Discovery dateJanuary 20, 1986
Designations
Designation
Uranus VI
Pronunciation/kɔːrˈdliə/[2]
AdjectivesCordelian[3]
Orbital characteristics[4]
49751.722±0.149 km
Eccentricity0.00026±0.000096
0.33503384±0.00000058 d
Inclination0.08479°±0.031° (to Uranus's equator)
Satellite ofUranus
Groupring shepherd
Physical characteristics
Dimensions50 × 36 × 36 km[5][note 1]
~5200 km2[a]
Volume33900±34.9% km3[6]
Mass(6.08±0.57)×1016 kg[6]
1.79+0.97
−0.49
 g/cm3
[6]
~0.006–0.013m/s2[a]
~0.018–0.021 km/s[a]
synchronous[5]
zero[5]
Albedo0.06±0.01[7]
0.07[8]
Temperature~65K[a]
23.62 (at opposition)
  1. ^Only two dimensions are known; the third dimension has been assumed to equal the smaller known dimension.

Cordelia is theinnermost known moon ofUranus. It was discovered from the images taken byVoyager 2 on January 20, 1986, and was given the temporary designationS/1986 U 7.[1] It was not detected again until theHubble Space Telescope observed it in 1997.[7][9] Cordelia takes its name from the youngest daughter of Lear inWilliam Shakespeare'sKing Lear. It is also designatedUranus VI.[10]

Other than its orbit,[4] size of 50 km × 36 km (31 mi × 22 mi),[5] andgeometric albedo of 0.06,[7] little is known about it. In theVoyager 2 images, Cordelia appears as an elongated object with its major axis pointing towards Uranus. The ratio of axes of Cordelia's prolate spheroid is0.7±0.2.[5]

Cordelia acts as the innershepherd satellite for Uranus'sε ring.[11] Cordelia's orbit is within Uranus's synchronous orbit radius, and is therefore slowly decaying due totidal deceleration.[5]

Cordelia is very close to a 5:3orbital resonance withRosalind.[12]

See also

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Notes

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  1. ^abcd Calculated on the basis of other parameters.

References

[edit]
  1. ^abSmith, B. A. (1986-01-27)."Satellites and Rings of Uranus".IAU Circular.4168. Retrieved2011-10-31.
  2. ^Benjamin Smith (1903).The Century Dictionary and Cyclopedia.
  3. ^Jennifer Bates (2010).Hegel and Shakespeare on Moral Imagination. p. 102.
  4. ^abJacobson, 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.
  5. ^abcdefKarkoschka, 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.
  6. ^abcFrench, 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.
  7. ^abcKarkoschka, 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.
  8. ^Williams, Dr. David R. (23 November 2007)."Uranian Satellite Fact Sheet".NASA (National Space Science Data Center). Retrieved12 December 2008.
  9. ^Showalter, M. R.; Lissauer, J. J. (2003-09-03)."Satellites of Uranus".IAU Circular.8194. Retrieved2011-10-31.
  10. ^"Planet and Satellite Names and Discoverers".Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. Retrieved6 August 2006.
  11. ^Esposito, L. W. (2002). "Planetary rings".Reports on Progress in Physics.65 (12):1741–1783.Bibcode:2002RPPh...65.1741E.doi:10.1088/0034-4885/65/12/201.S2CID 250909885.
  12. ^Murray, Carl D.; Thompson, Robert P. (1990-12-06). "Orbits of shepherd satellites deduced from the structure of the rings of Uranus".Nature.348 (6301):499–502.Bibcode:1990Natur.348..499M.doi:10.1038/348499a0.ISSN 0028-0836.S2CID 4320268.

External links

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