View source for Prospero (moon)

{{Short description|Moon of Uranus}}
{{Infobox planet
| name = Prospero
| image = Prospero - Uranus moon.jpg
| image_scale =
| caption = Discovery image of Prospero, taken by the [[CFHT]] in July 1999
| mpc_name = Uranus XVIII
| pronounced = {{IPAc-en|ˈ|p|r|ɒ|s|p|ɛ|r|oʊ}}<ref>Benjamin Smith (1903), ''The Century Dictionary and Cyclopedia''</ref>
| adjectives = Prosperonian {{IPAc-en|p|r|ɒ|s|p|ɛ|ˈ|r|oʊ|n|i|ə|n}},<ref>[[Ernest Emenyonu|Emenyonu, Ernest]] (2003), ''Emerging perspectives on Chinua Achebe'', v. 1.</ref> Prosperian {{IPAc-en|p|r|ɒ|ˈ|s|p|ɪər|i|ə|n}}<ref>in scare quotes in Bate (1997) ''The genius of Shakespeare''</ref>
| discoverer =
  {{plainlist |
* [[John J. Kavelaars]]
* [[Brett J. Gladman]]
* [[Matthew J. Holman]]
* [[Jean-Marc Petit]]
* [[Hans Scholl (astronomer)|Hans Scholl]]
  }}
| discovered = 18 July 1999
| mean_orbit_radius = 16,256,000&nbsp;km{{sfn|Sheppard|Jewitt|Kleyna|2005|p=523|loc=Table 3}}<ref name="JPL" />
| eccentricity = 0.4448<ref name="JPL" />
| period = 1978.29 d<!-- Sheppard 2005 has 1977.3 -->
| inclination = <!-- 164.04° (to Uranus's equator) <br /> 151.97° (to the local [[Laplace plane]]) <br /> -->152°{{sfn|Sheppard|Jewitt|Kleyna|2005|p=523|loc=Table 3}} (to the [[ecliptic]]){{sfn|Sheppard|Jewitt|Kleyna|2005|p=523|loc=Table 3}}
| satellite_of = [[Uranus]]
| mean_radius = 25&nbsp;km (estimate){{refn|name=Sheppard et al. 2005 radius/albedo}}<br/><50 km<ref name="FarkasTakacs2017"/>
| surface_area = ~8000 km<sup>2</sup> (estimate)
| volume = ~65,000 km<sup>3</sup> (estimate)
| mass = ~8.5{{e|16}}  [[kilogram|kg]] (estimate)
| surface_grav = ~0.0063 [[Acceleration|m/s<sup>2</sup>]] (estimate)
| escape_velocity = ~0.021&nbsp;km/s (estimate)
| density = ~1.3 g/cm<sup>3</sup> (assumed)
| rotation = {{val|7.145|0.092|u=h}}<ref name="FarkasTakacs2017"/>
| axial_tilt = ?
| albedo = 0.04 (assumed){{refn|name=Sheppard et al. 2005 radius/albedo}}
| single_temperature = ~65 [[Kelvin|K]] (estimate)
}}

'''Prospero''' is a relatively small [[retrograde motion|retrograde]] [[irregular satellite]] of [[Uranus]] discovered on 18 July 1999 by the [[astrophysicist]] [[Matthew Holman]] and his team, and given the provisional designation '''S/1999&nbsp;U&nbsp;3'''. Confirmed as '''Uranus&nbsp;XVIII''' it was named after the sorcerer [[Prospero]] in [[William Shakespeare]]'s play ''[[The Tempest (play)|The Tempest]]''.

[[File:Prospero discovery image.gif|thumb|left|upright|Animation of discovery images to show Prospero's motion among background stars]]

The orbital parameters suggest that it may belong to the same dynamic cluster as [[Sycorax (moon)|Sycorax]] and [[Setebos (moon)|Setebos]], suggesting common origin.<ref name="Grav 2003" /> However, this suggestion does not appear to be supported by the observed colours. The satellite appears neutral (grey) in [[visible light]] ([[color index|colour indices]] B−V=0.80, R−V=0.39),{{sfn|Grav|Holman|Fraser|2004|p=}} similar to Setebos but different from Sycorax (which is light red).

{{clear|left}}

== See also ==

* [[Uranus's natural satellites]]
* [[Irregular satellite]]s

== References ==

{{reflist
| refs =

<ref name="JPL">
{{cite web
| last = Yeomans
| first = Donald K.
| date = 28 June 2007
| title = Planetary Satellite Mean Orbital Parameters
| publisher = JPL/NASA
| url = http://ssd.jpl.nasa.gov/?sat_elem#uranus
| accessdate = 19 January 2008
}}
</ref>

<ref name="Grav 2003">
Grav, Tommy; Holman, Matthew J.; Gladman, Brett J.; [[Kaare Aksnes|Aksnes, Kaare]] ''Photometric survey of the irregular satellites'', Icarus, '''166''', (2003), pp. 33–45. {{arxiv|astro-ph/0301016}}
</ref>

<ref name="Sheppard et al. 2005 radius/albedo">
{{harvnb|Sheppard|Jewitt|Kleyna|2005|p=523|loc=Table 3 ... r<sup>i</sup> (km) ... 25 ... <sup>i</sup> Radius of satellite assuming a geometric albedo of 0.04}}.
</ref>

<ref name="FarkasTakacs2017">{{cite journal
  |title      = Properties of the Irregular Satellite System around Uranus Inferred from K2, Herschel, and Spitzer Observations
  |display-authors = etal
  |first1     = A. |last1 = Farkas-Takács
  |first2     = Cs. |last2 = Kiss
  |first3     = A. |last3 = Pál
  |first4     = L. |last4 = Molnár
  |first5     = Gy. M. |last5 = Szabó
  |first6     = O. |last6 = Hanyecz
  |date       = September 2017
  |journal    = The Astronomical Journal
  |volume     = 154
  |issue      = 3
  |id         = 119
  |pages      = 13
  |doi        = 10.3847/1538-3881/aa8365
  |arxiv      = 1706.06837
  |bibcode    = 2017AJ....154..119F|s2cid = 118869078
 |doi-access = free
 }}</ref>
}}
* {{cite journal| doi = 10.1086/424997| last1 = Grav| first1 = Tommy| last2 = Holman| first2 = Matthew J.| author-link2 = Matthew J. Holman| last3 = Fraser| first3 = Wesley C.| date = 20 September 2004| title = Photometry of Irregular Satellites of Uranus and Neptune| journal = [[The Astrophysical Journal]]| volume = 613| issue = 1| pages = L77–L80| arxiv = astro-ph/0405605| bibcode = 2004ApJ...613L..77G| s2cid = 15706906}}
* {{Cite journal | last1 = Sheppard | first1 = S. S. | last2 = Jewitt | first2 = D. | last3 = Kleyna | first3 = J. | title = An Ultradeep Survey for Irregular Satellites of Uranus: Limits to Completeness | doi = 10.1086/426329 | journal = The Astronomical Journal | volume = 129 | pages = 518–525 | year = 2005 | issue = 1 |arxiv = astro-ph/0410059 |bibcode = 2005AJ....129..518S | s2cid = 18688556 }}

== External links ==
* [https://web.archive.org/web/20070608214043/http://solarsystem.nasa.gov/planets/profile.cfm?Object=Ura_Prospero Prospero Profile] by [http://solarsystem.nasa.gov NASA's Solar System Exploration]
* [https://web.archive.org/web/20070624084542/http://www.ifa.hawaii.edu/~jewitt/irregulars.html David Jewitt pages]
* [https://web.archive.org/web/20080131134929/http://www.dtm.ciw.edu/sheppard/satellites/urasatdata.html Uranus' Known Satellites] (by [[Scott S. Sheppard]])
* [http://www.minorplanetcenter.org/iau/NatSats/NaturalSatellites.html MPC: Natural Satellites Ephemeris Service]

{{Uranus}}
{{Moons of Uranus}}
{{Solar System moons (compact)}}

{{DEFAULTSORT:Prospero (Moon)}}
[[Category:Moons of Uranus]]
[[Category:Irregular satellites]]
[[Category:Discoveries by Matthew J. Holman| ]]
[[Category:Discoveries by Brett J. Gladman]]
[[Category:Astronomical objects discovered in 1999|19990718]]
[[Category:Moons with a retrograde orbit]]
[[Category:The Tempest]]