| 词条 | Cordelia (moon) |
| 释义 |
| name = Cordelia | image = Cordeliamoon.png | caption = Cordelia (image taken 21 January 1986) | discoverer = Richard J. Terrile / Voyager 2 | discovered = January 20, 1986 | mean_orbit_radius = 49751.722 ± 0.149 km | eccentricity = 0.00026 ± 0.000096 | period = 0.33503384 ± 0.00000058 d | inclination = 0.08479 ± 0.031° (to Uranus' equator) | satellite_of = Uranus | dimensions = 50 × 36 × 36 km[5] | mean_radius = 20.1 ± 3 km[5][7][8] | surface_area = ~5500 km²{{efn|name=calculated}} | volume = ~38,900 km³{{efn|name=calculated}} | mass = ~4.4{{e|16}} kg{{efn|name=calculated}} | density = ~1.3 g/cm³ (assumed)[7] | surface_grav = ~0.0073 m/s²{{efn|name=calculated}} | escape_velocity = ~0.017 km/s{{efn|name=calculated}} | rotation = synchronous[5] | axial_tilt = zero[5] | albedo =
| single_temperature = ~64 K{{efn|name=calculated}} }}Cordelia ({{IPAc-en|k|ɔr|ˈ|d|iː|l|i|ə}} {{respell|kor|DEE|lee-ə}}) 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.[15] It was not detected again until the Hubble Space Telescope observed it in 1997.[12][17] Cordelia takes its name from the youngest daughter of Lear in William Shakespeare's King Lear. It is also designated Uranus VI.[18] Other than its orbit, radius of 20 km[5] and geometric albedo of 0.08[12] 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.[23] 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.[25] See also
ReferencesExplanatory notes{{notes| notes ={{efn | name = calculated | Calculated on the basis of other parameters. }} }}Citations 1. ^1 2 3 4 5 6 7 {{cite journal| doi = 10.1006/icar.2001.6597| last = Karkoschka| first = Erich| authorlink = Erich Karkoschka| year = 2001| title = Voyager's Eleventh Discovery of a Satellite of Uranus and Photometry and the First Size Measurements of Nine Satellites| journal = Icarus| volume = 151| issue = 1| pages = 69–77| bibcode = 2001Icar..151...69K| ref = {{sfnRef|Karkoschka, Voyager|2001}}}} [1][2][3][4][5][6][7][8][9]2. ^1 2 3 {{cite web| publisher = JPL (Solar System Dynamics)| title = Planetary Satellite Physical Parameters| date = 24 October 2008| url = http://ssd.jpl.nasa.gov/?sat_phys_par| accessdate = 12 December 2008}} 3. ^1 2 {{cite web| last = Williams| first = Dr. David R.| date = 23 November 2007| title = Uranian Satellite Fact Sheet| publisher = NASA (National Space Science Data Center)| url = http://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html| accessdate = 12 December 2008}} 4. ^1 2 3 {{cite journal| doi = 10.1006/icar.2001.6596| last = Karkoschka| first = Erich| authorlink = Erich Karkoschka| year = 2001| title = Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope| journal = Icarus| volume = 151| issue = 1| pages = 51–68| bibcode = 2001Icar..151...51K| ref = {{sfnRef|Karkoschka, Hubble|2001}}}} 5. ^1 {{cite journal| last = Smith| first = B. A.| title = Satellites and Rings of Uranus| journal = IAU Circular| volume = 4168| date = 1986-01-27| url = http://www.cbat.eps.harvard.edu/iauc/04100/04168.html#item1| accessdate = 2011-10-31}} 6. ^1 {{cite journal| last1 = Showalter| first1 = M. R.| last2 = Lissauer| first2 = J. J.| title = Satellites of Uranus| journal = IAU Circular| volume = 8194| date = 2003-09-03| url = http://www.cbat.eps.harvard.edu/iauc/08100/08194.html| accessdate = 2011-10-31}} 7. ^1 {{cite web| title = Planet and Satellite Names and Discoverers| work = Gazetteer of Planetary Nomenclature| publisher = USGS Astrogeology| date = July 21, 2006| url = http://planetarynames.wr.usgs.gov/Page/Planets| accessdate = 6 August 2006}} 8. ^1 {{cite journal| doi = 10.1088/0034-4885/65/12/201| last = Esposito| first = L. W.| authorlink = Larry W. Esposito| year = 2002| title = Planetary rings| journal = Reports on Progress in Physics| volume = 65| issue = 12| pages = 1741–1783| bibcode = 2002RPPh...65.1741E| ref = harv}} 9. ^1 {{cite journal| doi = 10.1038/348499a0| last1 = Murray| first1 = Carl D.| last2 = Thompson| first2 = Robert P.| date = 1990-12-06| title = Orbits of shepherd satellites deduced from the structure of the rings of Uranus| journal = Nature| issn = 0028-0836| volume = 348| issue = 6301| pages = 499–502| pmid = | pmc = | bibcode = 1990Natur.348..499M| ref = harv}} }} External links
2 : Moons of Uranus|Astronomical objects discovered in 1986 |
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