Cordelia (moon)

Cordelia
	Cordelia (Imaged 24 January 1986)
Discovery
Discovered by	Richard J. Terrile / Voyager 2
Discovery date	January 20, 1986
Designations
Designation	Uranus VI
Pronunciation	/kɔːrˈdiːliə/
Adjectives	Cordelian
Orbital characteristics
Semi-major axis	49751.722±0.149 km
Eccentricity	0.00026±0.000096
Orbital period (sidereal)	0.33503384±0.00000058 d
Inclination	0.08479°±0.031° (to Uranus' equator)
Satellite of	Uranus
Group	ring shepherd
Physical characteristics
Dimensions	50 × 36 × 36 km
Surface area	~5200 km2
Volume	33900±34.9% km3
Mass	(6.08±0.57)×1016 kg
Mean density	1.79+0.97; −0.49 g/cm3
Surface gravity	~0.006–0.013 m/s2
Escape velocity	~0.018–0.021 km/s
Synodic rotation period	synchronous
Axial tilt	zero
Albedo	0.06±0.01; 0.07
Temperature	~65 K
	^ Only two dimensions are known; the third dimension has been assumed to equal the smaller known dimension. ;

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.^[1] 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,^[4] size of 50 × 36 km^[5] and geometric albedo of 0.06^[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.^[5]

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.^[5]

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

Notes[edit]

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

References[edit]

^ ^a ^b Smith, B. A. (1986-01-27). "Satellites and Rings of Uranus". IAU Circular. 4168. Retrieved 2011-10-31.
^ Benjamin Smith (1903). The Century Dictionary and Cyclopedia.
^ Jennifer Bates (2010). Hegel and Shakespeare on Moral Imagination. p. 102.
^ ^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.
^ ^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.
^ ^a ^b ^c 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.
^ ^a ^b ^c 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.
^ Williams, Dr. David R. (23 November 2007). "Uranian Satellite Fact Sheet". NASA (National Space Science Data Center). Retrieved 12 December 2008.
^ Showalter, M. R.; Lissauer, J. J. (2003-09-03). "Satellites of Uranus". IAU Circular. 8194. Retrieved 2011-10-31.
^ "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. Retrieved 6 August 2006.
^ 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.
^ 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[edit]

[6] Only two dimensions are known; the third dimension has been assumed to equal the smaller known dimension.

[calculated-7] Calculated on the basis of other parameters.

[IAUC_4168-1] Smith, B. A. (1986-01-27). "Satellites and Rings of Uranus". IAU Circular. 4168. Retrieved 2011-10-31.

[2] Benjamin Smith (1903). The Century Dictionary and Cyclopedia.

[3] Jennifer Bates (2010). Hegel and Shakespeare on Moral Imagination. p. 102.

[Jacobson_1998-4] 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. Bibcode:1998AJ....115.1195J. doi:10.1086/300263.

[Karkoschka,_Voyager_2001-5] ^ ^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.

[FrenchEtAl2024-8] 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.

[Karkoschka,_Hubble_2001-9] 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.

[Williams_2007_nssdc-10] Williams, Dr. David R. (23 November 2007). "Uranian Satellite Fact Sheet". NASA (National Space Science Data Center). Retrieved 12 December 2008.

[IAUC_8194-11] Showalter, M. R.; Lissauer, J. J. (2003-09-03). "Satellites of Uranus". IAU Circular. 8194. Retrieved 2011-10-31.

[Gazetteer-12] "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. Retrieved 6 August 2006.

[Esposito_2002-13] 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.

[Murray_Thompson_1990-14] 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.

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