Ophelia (moon)
{{Short description|Moon of Uranus}}
{{Infobox planet
| name = Ophelia
| image = Opheliamoon.png
| caption = Ophelia (image taken 21 January 1986)
| mpc_name = Uranus VII
| pronounced = {{IPAc-en|oʊ|ˈ|f|iː|l|i|ə}}{{cite book|author=Benjamin Smith|year=1903|title=The Century Dictionary and Cyclopedia}}
| adjective = Ophelian {{IPAc-en|ɒ|ˈ|f|iː|l|i|ə|n}}{{OED|Ophelian}}
| discoverer = Richard J. Terrile / Voyager 2
| discovered = January 20, 1986
| semimajor = {{val|53763.390|0.847|u=km}}
| eccentricity = {{val|0.00992|0.000107}}
| period = {{val|0.37640039|0.00000357|u=d}}
| avg_speed = 10.39 km/s{{efn|name=calculated}}
| inclination = {{val|0.10362|0.055|u=°}} (to Uranus's equator)
| satellite_of = Uranus
| group = ring shepherd
| dimensions = 54 × 38 × 38 km{{refn|group=note|Only two dimensions are known; the third dimension has been assumed to equal the smaller known dimension.}}
| surface_area = ~5900 km2{{efn|name=calculated}}
| volume = {{val|40800|50.4|u=km3|errend=%}}
| mass = {{val|3.57|0.32|u=kg|e=16}}
| density = {{val|0.87|0.89|0.30|u=g/cm3}}
| surface_grav = ~{{Gr|3.57e-5|27}}–{{Gr|3.57e-5|19}} m/s2{{efn|name=calculated}}
| escape_velocity = ~{{V2|3.57e-5|27}}–{{V2|3.57e-5|19}} km/s{{efn|name=calculated}}
| albedo = {{val|0.065|0.01}}
0.07
| single_temperature = ~65 K{{efn|name=calculated}}
}}
Ophelia is a 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 8. It was not seen again until the Hubble Space Telescope recovered it in 2003. Ophelia was named after the daughter of Polonius, Ophelia, in William Shakespeare's play Hamlet. It is also designated Uranus VII.
Other than its orbit, size of 54 × 38 km, and geometric albedo of 0.065, little is known about it. In Voyager 2, images Ophelia appears as an elongated object, with its major axis pointing towards Uranus. The ratio of axes of the Ophelia's prolate spheroid is 0.7 ± 0.3.
Ophelia acts as the outer shepherd satellite for Uranus's ε ring. The orbit of Ophelia is within the synchronous orbit radius of Uranus, and is therefore slowly decaying due to tidal forces.
See also
Notes
{{notes
| notes =
{{efn
| name = calculated
| Calculated on the basis of other parameters.
}}
}}
References
{{reflist
| refs =
{{cite journal| doi = 10.1086/300263| last1 = Jacobson| first1 = R. A.| year = 1998| title = The Orbits of the Inner Uranian Satellites From Hubble Space Telescope and Voyager 2 Observations| journal = The Astronomical Journal| volume = 115| issue = 3| pages = 1195–1199| bibcode = 1998AJ....115.1195J| s2cid = 118616209| doi-access = free}}
{{cite journal| doi = 10.1006/icar.2001.6597| last = Karkoschka| first = Erich| author-link = 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}}}}
{{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
| access-date = 12 December 2008
}}
{{cite journal| doi = 10.1006/icar.2001.6596| last = Karkoschka| first = Erich| author-link = 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}}}}
{{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
| access-date = 2011-10-31
}}
{{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
| access-date = 2011-10-31
}}
{{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/append7.html
| access-date = 6 August 2006
| archive-url = https://web.archive.org/web/20160305150456/http://planetarynames.wr.usgs.gov/Page/Planets
| archive-date = 5 March 2016
}}
{{cite journal| doi = 10.1088/0034-4885/65/12/201| last = Esposito| first = L. W.| author-link = 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| s2cid = 250909885}}
{{Cite journal |last=French |first=Richard G. |last2=Hedman |first2=Matthew M. |last3=Nicholson |first3=Philip D. |last4=Longaretti |first4=Pierre-Yves |last5=McGhee-French |first5=Colleen A. |date=2024-03-15 |title=The Uranus system from occultation observations (1977–2006): Rings, pole direction, gravity field, and masses of Cressida, Cordelia, and Ophelia |url=https://www.sciencedirect.com/science/article/pii/S0019103524000150 |journal=Icarus |volume=411 |pages=115957 |doi=10.1016/j.icarus.2024.115957 |issn=0019-1035|arxiv=2401.04634 }}
}}
External links
- [https://web.archive.org/web/20070801203853/http://solarsystem.nasa.gov/planets/profile.cfm?Object=Ura_Ophelia Ophelia Profile] by [http://solarsystem.nasa.gov NASA's Solar System Exploration]
- [http://www.dtm.ciw.edu/users/sheppard/satellites/urasatdata.html Uranus' Known Satellites] (by Scott S. Sheppard)
{{Uranus}}
{{Moons of Uranus}}
{{Solar System moons (compact)}}
{{DEFAULTSORT:Ophelia (Moon)}}