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'''Cordelia''' ({{pron-en|kɔrˈdiːliə}} {{respell|kor|DEE|lee-ə}}) is the [[inner satellite|innermost 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&nbsp;U&nbsp;7'''.<ref>{{cite web|last=Smith|first=B. A.|title=IAU Circular No. 4168|date=1986-01-27|url= http://cfa-www.harvard.edu/iauc/04100/04168.html#item1|accessdate=2006-08-06}}</ref> It was not detected again until the [[Hubble Space Telescope]] observed it in 1997.<ref name="Karkoschka2001a"/><ref>{{cite web|last=Showalter|first=M. R.|coauthors=Lissauer, J. J.|title=IAU Circular No. 8194|date=2003-09-03|url=http://cfa-www.harvard.edu/iauc/08100/08194.html|accessdate=2006-08-05}}</ref> Cordelia takes its name from the youngest daughter of Lear in [[William Shakespeare]]'s ''[[King Lear]].'' It is also designated '''Uranus&nbsp;VI'''.<ref name="Gazetteer">{{cite web|title=Planet and Satellite Names and Discoverers|work=Gazetteer of Planetary Nomenclature|publisher= USGS Astrogeology|date=2006-07-21|url=http://planetarynames.wr.usgs.gov/append7.html|accessdate=2006-08-06}}</ref>
'''Cordelia''' ({{pron-en|kɔrˈdiːliə}} {{respell|kor|DEE|lee-ə}}) is the [[inner satellite|innermost 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&nbsp;U&nbsp;7'''.<ref>{{cite web|last=Smith|first=B. A.|title=IAU Circular No. 4168|date=1986-01-27|url= http://cfa-www.harvard.edu/iauc/04100/04168.html#item1|accessdate=2006-08-06}}</ref> It was not detected again until the [[Hubble Space Telescope]] observed it in 1997.<ref name="Karkoschka2001a"/><ref>{{cite web|last=Showalter|first=M. R.|coauthors=Lissauer, J. J.|title=IAU Circular No. 8194|date=2003-09-03|url=http://cfa-www.harvard.edu/iauc/08100/08194.html|accessdate=2006-08-05}}</ref> Cordelia takes its name from the youngest daughter of Lear in [[William Shakespeare]]'s ''[[King Lear]].'' It is also designated '''Uranus&nbsp;VI'''.<ref name="Gazetteer">{{cite web|title=Planet and Satellite Names and Discoverers|work=Gazetteer of Planetary Nomenclature|publisher= USGS Astrogeology|date=2006-07-21|url=http://planetarynames.wr.usgs.gov/append7.html|accessdate=2006-08-06}}</ref>


Unfortunately, other than its orbit,<ref name=Jacobson1998/> radius of 20&nbsp;km<ref name="Karkoschka2001b"/> and geometric albedo of 0.08<ref name="Karkoschka2001a"/> virtually nothing is known about it. At the Voyager 2 images Cordelia appears as an elongated object, the major axis pointing towards Uranus. The ratio of axises of the Cordelia's prolate spheroid is 0.7 ± 0.2.<ref name="Karkoschka2001b"/>
Other than its orbit,<ref name=Jacobson1998/> radius of 20&nbsp;km<ref name="Karkoschka2001b"/> and geometric albedo of 0.08<ref name="Karkoschka2001a"/> virtually nothing is known about it. At the Voyager 2 images Cordelia appears as an elongated object, the major axis pointing towards Uranus. The ratio of axises of the Cordelia's prolate spheroid is 0.7 ± 0.2.<ref name="Karkoschka2001b"/>


Cordelia acts as the inner [[shepherd satellite]] for Uranus' [[rings of Uranus|Epsilon ring]].<ref name=Esposito2002>{{cite journal |last=Esposito |first=L. W. |authorlink=Larry W. Esposito |title=Planetary rings |journal=Reports On Progress In Physics |year=2002 |volume=65 |pages=1741–1783 |url=http://www.iop.org/EJ/abstract/0034-4885/65/12/201 |doi=10.1088/0034-4885/65/12/201}}</ref> Cordelia's orbit is within Uranus' synchronous orbit radius, and is therefore slowly decaying due to [[tidal deceleration]].<ref name="Karkoschka2001b"/>
Cordelia acts as the inner [[shepherd satellite]] for Uranus' [[rings of Uranus|Epsilon ring]].<ref name=Esposito2002>{{cite journal |last=Esposito |first=L. W. |authorlink=Larry W. Esposito |title=Planetary rings |journal=Reports On Progress In Physics |year=2002 |volume=65 |pages=1741–1783 |url=http://www.iop.org/EJ/abstract/0034-4885/65/12/201 |doi=10.1088/0034-4885/65/12/201}}</ref> Cordelia's orbit is within Uranus' synchronous orbit radius, and is therefore slowly decaying due to [[tidal deceleration]].<ref name="Karkoschka2001b"/>

Revision as of 23:13, 19 May 2010

Cordelia
Cordelia
Cordelia (lower-middle, inside of bright ring), discovery image from Voyager 2
Discovery
Discovered byRichard J. Terrile / Voyager 2
Discovery dateJanuary 20, 1986
Orbital characteristics
Mean orbit radius
49751.722 ± 0.149 km[1]
Eccentricity0.00026 ± 0.000096[1]
0.33503384 ± 0.00000058 d[1]
Inclination0.08479 ± 0.031° (to Uranus' equator)[1]
Satellite ofUranus
Physical characteristics
Dimensions50 × 36 × 36 km[2]
20.1 ± 3 km[2][3][4]
~5500 km²[5]
Volume~38,900 km³[5]
Mass~4.4×1016 kg[5]
Mean density
~1.3 g/cm³ assumed[3]
~0.0073 m/s²[5]
~0.017 km/s[5]
synchronous[2]
zero[2]
Albedo0.08 ± 0.01 [6]
0.07[3][4]
Temperature~64 K[5]

Cordelia (Template:Pron-en kor-DEE-lee-ə) is the innermost 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.[7] It was not detected again until the Hubble Space Telescope observed it in 1997.[6][8] Cordelia takes its name from the youngest daughter of Lear in William Shakespeare's King Lear. It is also designated Uranus VI.[9]

Other than its orbit,[1] radius of 20 km[2] and geometric albedo of 0.08[6] virtually nothing is known about it. At the Voyager 2 images Cordelia appears as an elongated object, the major axis pointing towards Uranus. The ratio of axises of the Cordelia's prolate spheroid is 0.7 ± 0.2.[2]

Cordelia acts as the inner shepherd satellite for Uranus' Epsilon ring.[10] Cordelia's orbit is within Uranus' synchronous orbit radius, and is therefore slowly decaying due to tidal deceleration.[2]

References

  1. ^ a b c d e Cite error: The named reference Jacobson1998 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Karkoschka2001b was invoked but never defined (see the help page).
  3. ^ a b c "Planetary Satellite Physical Parameters". JPL (Solar System Dynamics). 2008-10-24. Retrieved 2008-12-12.
  4. ^ a b Williams, Dr. David R. (2007-11-23). "Uranian Satellite Fact Sheet". NASA (National Space Science Data Center). Retrieved 2008-12-12.
  5. ^ a b c d e f Calculated on the basis of other parameters
  6. ^ a b c Cite error: The named reference Karkoschka2001a was invoked but never defined (see the help page).
  7. ^ Smith, B. A. (1986-01-27). "IAU Circular No. 4168". Retrieved 2006-08-06.
  8. ^ Showalter, M. R. (2003-09-03). "IAU Circular No. 8194". Retrieved 2006-08-05. {{cite web}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
  9. ^ "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. 2006-07-21. Retrieved 2006-08-06.
  10. ^ Esposito, L. W. (2002). "Planetary rings". Reports On Progress In Physics. 65: 1741–1783. doi:10.1088/0034-4885/65/12/201.
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