Editing Belinda (moon)

{{Short description|Moon of Uranus}}
{{Infobox planet
| name             = Belinda
| image            = Belinda.gif
| image_alt        = Image of Belinda acquired by Voyager 2
| caption          = {{longitem|Belinda viewed by ''[[Voyager 2]]'' in 1986|style=padding: 4px 0;}}
| discoverer       = [[Stephen P. Synnott]] / ''[[Voyager 2]]''
| discovered       = January 13, 1986
| mpc_name         = Uranus XIV
| pronounced       = {{IPAc-en|b|ə|ˈ|l|ɪ|n|d|ə}}<ref>{{cite book|author=Benjamin Smith|year=1903|title=The Century Dictionary and Cyclopedia}}</ref>
| adjective        = Belindian
| orbit_ref        = {{sfn|Jacobson|1998}}
| semimajor        = 75 255.613 ± 0.057 km
| eccentricity     = 0.00007 ± 0.000073
| period           = {{nowrap|0.623527470 ± 0.000000017 d}}
| inclination      = 0.03063 ± 0.028° (to Uranus's equator)
| satellite_of     = [[Uranus]]
| dimensions       = 128 × 64 × 64 km{{sfn|Karkoschka, Voyager|2001}}{{refn|group=note|Only two dimensions are known; the third dimension has been assumed to equal the smaller known dimension.}}
| surface_area     = ~{{val|22000|u=km2}}{{efn|name=calculated}}
| volume           = ~{{val|270000|u=km3}}{{efn|Volume derived from the long axis ''A'', the medium axis ''B'' and the short axis ''C'': <math>\frac{\pi}{6} ABC</math>}}
| mass             = ~{{val|1.4|-|2.3|e=17|u=kg}}{{efn|name=calculated}}{{efn|It is known that Belinda is 26 times the mass of Perdita.<ref name="FrenchEtAl2017"/> Perdita has a mean radius of {{val|13.3|0.7|u=km}}{{refn|Showalter & Lissauer (2006),{{sfn|Showalter|Lissauer|2006}} as cited in Ćuk et al. (2022).{{sfn|Ćuk et al.|2022}}}} and a density at maximum of {{val|0.9|u=g/cm3}},{{sfn|Ćuk et al.|2022}} meaning its mass is at maximum {{val|8.87|e=15|u=kg}}, which makes Belinda's mass at maximum {{val|2.3|e=17|u=kg}}.}}
| density          = {{val|0.5|-|0.84|u=g/cm3}}<ref name="French Showalter 2012"/>{{efn|Maximum density obtained from the calculated maximum mass and the presupposed volume of ~{{val|270000|u=km3}}.}}
| surface_grav     = ~{{Gr|1.4e-4|64}}–{{Gr|2.3e-4|32}} [[Acceleration|m/s<sup>2</sup>]]{{efn|Surface gravity derived from the mass ''m'', the [[gravitational constant]] ''G'' and the radius ''r'': <math>\frac{Gm}{r^2}</math>}}
| escape_velocity  = ~{{V2|1.4e-4|64}}–{{V2|2.3e-4|32}} km/s{{efn|Escape velocity derived from the mass ''m'', the [[gravitational constant]] ''G'' and the radius ''r'': <math>\sqrt{\frac{2Gm}{r}}</math>}}
| rotation         = synchronous{{sfn|Karkoschka, Voyager|2001}}
| axial_tilt       = zero{{sfn|Karkoschka, Voyager|2001}}
| albedo           = 0.08 ± 0.01{{sfn|Karkoschka, Hubble|2001}}
| single_temperature = ~64 [[Kelvin|K]]{{efn|name=calculated}}
}}

'''Belinda''' is an [[inner satellite]] of the planet [[Uranus]]. Belinda was discovered from the images taken by ''[[Voyager 2]]'' on 13 January 1986 and was given the temporary designation '''S/1986&nbsp;U&nbsp;5'''.{{sfn|IAUC 4164}} It is named after the heroine of [[Alexander Pope]]'s ''[[The Rape of the Lock]]''. It is also designated '''Uranus&nbsp;XIV'''.{{sfn|USGS: Planet and Satellite Names and Discoverers}}

Belinda belongs to the Portia group of satellites, which also includes [[Bianca (moon)|Bianca]], [[Cressida (moon)|Cressida]], [[Desdemona (moon)|Desdemona]], [[Portia (moon)|Portia]], [[Juliet (moon)|Juliet]], [[Cupid (moon)|Cupid]], [[Rosalind (moon)|Rosalind]], and [[Perdita (moon)|Perdita]].{{sfn|Karkoschka, Hubble|2001}} These satellites have similar orbits and photometric properties.{{sfn|Karkoschka, Hubble|2001}} Other than its orbit,{{sfn|Jacobson|1998}} size of 128 × 64 km,{{sfn|Karkoschka, Voyager|2001}} and geometric albedo of 0.08,{{sfn|Karkoschka, Hubble|2001}} virtually nothing is known about it.

''[[Voyager 2]]'' images show Belinda as an elongated object with its major axis pointing towards Uranus. The moon is very elongated, with its short axis 0.5 ± 0.1 times the long axis.{{sfn|Karkoschka, Voyager|2001}} Its surface is grey in color.{{sfn|Karkoschka, Voyager|2001}}

Belinda is in a stable 44:43 [[mean-motion resonance]] with Perdita, and from this its mass has been determined to be roughly 26 times that of Perdita.<ref name="FrenchEtAl2017">{{Cite conference |last=French |first=Robert S. |last2=Showalter |first2=Mark R. |last3=de Pater |first3=Imke |last4=Lissauer |first4=Jack J. |date=2017-10-01 |title=Orbital and Photometric Analysis of the Inner Uranian Satellites from Hubble Images |url=https://ui.adsabs.harvard.edu/abs/2017DPS....4921419F |volume=49 |pages=214.19}}</ref>

The inner moon system is unstable over timescales of several millions of years. Belinda and Cupid will probably be the first pair of moons to collide, in 100,000 to 10 million years' time depending on the densities of the Portia-group satellites, due to resonant interactions with the much smaller Cupid.<ref name="French Showalter 2012">{{cite journal |last1=French |first1=Robert S. |last2=Showalter |first2=Mark R. |title=Cupid is doomed: An analysis of the stability of the inner uranian satellites |journal=Icarus |date=August 2012 |volume=220 |issue=2 |pages=911–921 |doi=10.1016/j.icarus.2012.06.031|arxiv=1408.2543 |bibcode=2012Icar..220..911F |s2cid=9708287 }}</ref>

== See also ==

* [[Moons of Uranus]]

== Notes ==
{{notes
| notes =

{{efn
| name = calculated
| Calculated on the basis of other parameters.
}}

}}

== References ==

=== Citations ===
{{reflist}}

=== Sources ===
* {{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
  | title = Planetary Satellite Physical Parameters
  | date = 18 October 2010
  | publisher = [[JPL]] (Solar System Dynamics)
  | url = http://ssd.jpl.nasa.gov/?sat_phys_par
  | access-date = 2012-01-27
  | ref = {{sfnRef|JPL Solar System Dynamics}}
  }}
* {{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 = 2012-01-27
  }}
* {{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 = Marsden
  | first = Brian G.
  | title = Satellites of Uranus
  | journal = IAU Circular
  | volume = 4164
  | date = 1986-01-16
  | url = http://www.cbat.eps.harvard.edu/iauc/04100/04164.html#Item1
  | access-date = 2012-01-27
  | ref = {{sfnRef|IAUC 4164}}
  }}
* {{cite web
  | author = [[USGS]]/[[IAU]]
  | title = Planet and Satellite Names and Discoverers
  | date = July 21, 2006
  | publisher = USGS Astrogeology
  | work = Gazetteer of Planetary Nomenclature
  | url = http://planetarynames.wr.usgs.gov/Page/Planets#UranianSystem
  | access-date = 2012-01-27
  | ref = {{sfnRef|USGS: Planet and Satellite Names and Discoverers}}
  }}
* {{Cite journal |last=Ćuk |first=Matija |last2=French |first2=Robert S. |last3=Showalter |first3=Mark R. |last4=Tiscareno |first4=Matthew S. |last5=Moutamid |first5=Maryame El |date=2022-07-16 |title=Cupid is not Doomed Yet: On the Stability of the Inner Moons of Uranus |url=https://dx.doi.org/10.3847/1538-3881/ac745d |journal=The Astronomical Journal |language=en |volume=164 |issue=2 |pages=38 |doi=10.3847/1538-3881/ac745d |issn=1538-3881|doi-access = free|ref={{sfnRef|Ćuk et al.|2022}}|arxiv=2205.14272 }}
*{{cite journal|last1=Showalter|first1=Mark R.|author1-link=Mark R. Showalter|last2=Lissauer|first2=Jack J.|author2-link=Jack J. Lissauer|date=17 February 2006|title=The Second Ring-Moon System of Uranus: Discovery and Dynamics|journal=Science|volume=311|issue=5763|pages=973–977|doi=10.1126/science.1122882|url=https://www.science.org/doi/10.1126/science.1122882}}

== External links ==
* [https://web.archive.org/web/20070608072503/http://solarsystem.nasa.gov/planets/profile.cfm?Object=Ura_Belinda Belinda 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:Belinda (Moon)}}
[[Category:Moons of Uranus]]
[[Category:Astronomical objects discovered in 1986|19860113]]
[[Category:Moons with a prograde orbit]]