Astronomy:Cordelia (moon)

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Short description: Moon of Uranus
Cordelia
Cordelia (Imaged 24 January 1986)
Discovery
Discovered byRichard J. Terrile / Voyager 2
Discovery dateJanuary 20, 1986
Designations
Designation
Uranus VI
Pronunciation/kɔːrˈdiːliə/[1]
AdjectivesCordelian[2]
Orbital characteristics
Mean orbit radius49751.722 ± 0.149 km[3]
Eccentricity0.00026 ± 0.000096[3]
Orbital period0.33503384 ± 0.00000058 d[3]
Inclination0.08479 ± 0.031° (to Uranus' equator)[3]
Satellite ofUranus
Groupring shepherd
Physical characteristics
Dimensions50 × 36 × 36 km[4]
Mean radius20.1 ± 3 km[4][5][6]
Surface area~5500 km2[lower-alpha 1]
Volume~38,900 km3[lower-alpha 1]
Mass~4.4×1016 kg[lower-alpha 1]
Mean density~1.3 g/cm3 (assumed)[5]
~0.0073 m/s2[lower-alpha 1]
~0.017 km/s[lower-alpha 1]
Rotation periodsynchronous[4]
Axial tiltzero[4]
Albedo
Physics~64 K[lower-alpha 1]


Cordelia is the innermost known moon of Uranus. It was discovered from the images taken by Voyager 2 on January 20, 1986, and was given the temporary designation S/1986 U 7.[8] It was not detected again until the Hubble Space Telescope observed it in 1997.[7][9] Cordelia takes its name from the youngest daughter of Lear in William Shakespeare's King Lear. It is also designated Uranus VI.[10]

Other than its orbit,[3] radius of 20 km[4] and geometric albedo of 0.08[7] virtually nothing is known about it. In the Voyager 2 images Cordelia appears as an elongated object with its major axis pointing towards Uranus. The ratio of axes of Cordelia's prolate spheroid is 0.7 ± 0.2.[4]

Cordelia acts as the inner shepherd satellite for Uranus' ε ring.[11] Cordelia's orbit is within Uranus' synchronous orbit radius, and is therefore slowly decaying due to tidal deceleration.[4]

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

See also

References

Explanatory notes

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Calculated on the basis of other parameters.

Citations

  1. ↑ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
  2. ↑ Jennifer Bates (2010) Hegel and Shakespeare on Moral Imagination, p. 102
  3. ↑ 3.0 3.1 3.2 3.3 3.4 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. doi:10.1086/300263. Bibcode: 1998AJ....115.1195J. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 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. doi:10.1006/icar.2001.6597. Bibcode: 2001Icar..151...69K. 
  5. ↑ 5.0 5.1 5.2 "Planetary Satellite Physical Parameters". JPL (Solar System Dynamics). 24 October 2008. http://ssd.jpl.nasa.gov/?sat_phys_par. 
  6. ↑ 6.0 6.1 Williams, Dr. David R. (23 November 2007). "Uranian Satellite Fact Sheet". NASA (National Space Science Data Center). http://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html. 
  7. ↑ 7.0 7.1 7.2 Karkoschka, Erich (2001). "Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope". Icarus 151 (1): 51–68. doi:10.1006/icar.2001.6596. Bibcode: 2001Icar..151...51K. 
  8. ↑ Smith, B. A. (1986-01-27). "Satellites and Rings of Uranus". IAU Circular 4168. http://www.cbat.eps.harvard.edu/iauc/04100/04168.html#item1. Retrieved 2011-10-31. 
  9. ↑ Showalter, M. R.; Lissauer, J. J. (2003-09-03). "Satellites of Uranus". IAU Circular 8194. http://www.cbat.eps.harvard.edu/iauc/08100/08194.html. Retrieved 2011-10-31. 
  10. ↑ "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. http://planetarynames.wr.usgs.gov/Page/Planets. 
  11. ↑ Esposito, L. W. (2002). "Planetary rings". Reports on Progress in Physics 65 (12): 1741–1783. doi:10.1088/0034-4885/65/12/201. Bibcode: 2002RPPh...65.1741E. 
  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. doi:10.1038/348499a0. ISSN 0028-0836. Bibcode: 1990Natur.348..499M. 



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