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{{Infobox Planet | bgcolour=#FFFFC0 | <!-- Scroll down to see the text of the article, below this table.-->
{{Infobox Planet | bgcolour=#FFFFC0 | <!-- Scroll down to see the text of the article, below this table.-->
name=90482 Orcus
name=90482 Orcus
| image=Orcus nasa.jpg
| symbol=[[File:Orcus symbol (bold).svg|24px|🝿]]
| image=Orcus-Vanth orbit.gif
| discoverer=[[Michael E. Brown|M. Brown]],<br />[[Chad Trujillo|C. Trujillo]],<br />[[David L. Rabinowitz|D. Rabinowitz]]
| discoverer=[[Michael E. Brown|M. Brown]],<br />[[Chad Trujillo|C. Trujillo]],<br />[[David L. Rabinowitz|D. Rabinowitz]]
| discovered=[[February 17]], [[2004]]
| discovered=[[February 17]], [[2004]]
| avg_speed=4.68 km/[[second|s]]
| avg_speed=4.68 km/[[second|s]]
| satellites=1 (92-432 km)
| satellites=1 (92-432 km)
| dimensions=946.3 {{±|74.1|72.3}} km (diameter)<ref name="Stansberry 2007">{{cite journal|author=Stansberry, J.| author2=Grundy, W.| author3= Brown, M.| display-authors = etal|title=Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope|url=https://arxiv.org/abs/astro-ph/0702538v1|year=2007}}</ref>
| dimensions=946.3 {{±|74.1|72.3}} km (diameter)<ref name="Stansberry 2007">{{cite journal|author=Stansberry, J.| author2=Grundy, W.| author3= Brown, M.| display-authors = etal|title=Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope|year=2007| arxiv=astro-ph/0702538}}</ref>
| mass=~7.5×10<sup>20</sup> [[kilogram|kg]]
| mass=~7.5×10<sup>20</sup> [[kilogram|kg]]
| density=~1.5 g/[[cubic centimetre|cm³]] (assumed)
| density=~1.5 g/[[cubic centimetre|cm³]] (assumed)
| single_temperature=~45 [[kelvin|K]]}}
| single_temperature=~45 [[kelvin|K]]}}
'''90482 Orcus''', originally known by the [[provisional designation]] '''2004 DW''', is a [[Kuiper belt]] object (KBO). It is also a [[dwarf planet]]. It was found by [[Michael E. Brown|Michael Brown]], [[Chad Trujillo]] and [[David L. Rabinowitz|David Rabinowitz]] on February 17, 2004. It was also seen in pictures from November 8, 1951. Like [[Pluto]] it is in [[orbital resonance]] with [[Neptune]] but it stays on the opposite side of the Sun from Pluto.
'''90482 Orcus''' (symbol: [[File:Orcus symbol (fixed width).svg|16px|🝿]]), originally known by the [[provisional designation]] '''2004 DW''', is a [[Kuiper belt]] object (KBO). It is also a [[dwarf planet]]. It was found by [[Michael E. Brown|Michael Brown]], [[Chad Trujillo]] and [[David L. Rabinowitz|David Rabinowitz]] on February 17, 2004. It was also seen in pictures from November 8, 1951. Like [[Pluto]] it is in [[orbital resonance]] with [[Neptune]] but it stays on the opposite side of the Sun from Pluto.
== Moon ==
== Moon ==
A moon of Orcus was found on [[22 February]] [[2007]].<ref>{{Cite web |url=http://www.johnstonsarchive.net/astro/astmoons/am-90482.html |title=(90482) Orcus and Vanth |access-date=2009-02-27 |archive-date=2012-02-08 |archive-url=https://www.webcitation.org/65IF3ZmvN?url=http://www.johnstonsarchive.net/astro/astmoons/am-90482.html |url-status=bot: unknown }}</ref>
A moon of Orcus was found on [[22 February]] [[2007]].<ref>{{Cite web |url=http://www.johnstonsarchive.net/astro/astmoons/am-90482.html |title=(90482) Orcus and Vanth |access-date=2009-02-27 |archive-date=2012-02-08 |archive-url=https://www.webcitation.org/65IF3ZmvN?url=http://www.johnstonsarchive.net/astro/astmoons/am-90482.html |url-status=bot: unknown }}</ref>
The satellite was found at 0.25 [[arcsecond|arcsec]] from Orcus with [[absolute magnitude|magnitude]] difference of 2.7.<ref name="EKO51">[http://www.boulder.swri.edu/ekonews/issues/past/n051/html/index.html Distant EKO] The Kuiper Belt Electronic newsletter, March 2007</ref> Assuming an [[albedo]] similar to that of the primary, the magnitude suggests a diameter of about 220 km. It is thought to be a smaller KBO that was captured.
The satellite was found at 0.25 [[arcsecond|arcsec]] from Orcus with [[absolute magnitude|magnitude]] difference of 2.7.<ref name="EKO51">[http://www.boulder.swri.edu/ekonews/issues/past/n051/html/index.html Distant EKO] The Kuiper Belt Electronic newsletter, March 2007</ref> Assuming an [[albedo]] similar to that of the primary, the magnitude suggests a diameter of about 220 km. It is thought to be a smaller KBO that was captured.
== 90482 Orcus Media ==
<gallery widths='160px' heights='100%' mode='traditional' caption=''>
File:Orcus nasa.jpg|Discovery image of Orcus taken in 2004
File:Orcus, Earth & Moon size comparison.png|Orcus compared to [[Earth]] and the [[Moon]]
File:Orcus-apmag19-2009Dec26-11UT.jpg|Long-exposure photograph of Orcus at visual magnitude 19.2
File:Orcus-Vanth.gif|Orcus and Vanth imaged by Hubble in 2006
</gallery>
== Other websites ==
== Other websites ==
* [http://cfa-www.harvard.edu/mpec/K04/K04D09.html MPEC 2004-D09] announcing the discovery but attributing it to [[Raymond J. Bambery]], [[Steven H. Pravdo]], [[Michael D. Hicks]], [[Kenneth J. Lawrence]], [[Daniel MacDonald]], [[Eleanor F. Helin]] and [[Robert Thicksten]] / [[NEAT]]
* [http://cfa-www.harvard.edu/mpec/K04/K04D09.html MPEC 2004-D09] announcing the discovery but attributing it to [[Raymond J. Bambery]], [[Steven H. Pravdo]], [[Michael D. Hicks]], [[Kenneth J. Lawrence]], [[Daniel MacDonald]], [[Eleanor F. Helin]] and [[Robert Thicksten]] / [[NEAT]]
* [http://cfa-www.harvard.edu/mpec/K04/K04D13.html MPEC 2004-D13] correcting MPEC 2004-D09
* [http://cfa-www.harvard.edu/mpec/K04/K04D13.html MPEC 2004-D13] correcting MPEC 2004-D09
* [http://www.chadtrujillo.com/2004dw/ Chad Trujillo's page on 2004 DW]
* [http://www.chadtrujillo.com/2004dw/ Chad Trujillo's page on 2004 DW] {{Webarchive|url=https://web.archive.org/web/20070322195011/http://www.chadtrujillo.com/2004dw/ |date=2007-03-22 }}
* [http://news.bbc.co.uk/2/hi/science/nature/3506329.stm First BBC article]
* [http://news.bbc.co.uk/2/hi/science/nature/3506329.stm First BBC article]
* [https://www.newscientist.com/news/news.jsp?id=ns99994702 First New Scientist article]
* [https://www.newscientist.com/news/news.jsp?id=ns99994702 First New Scientist article]
* [http://hamilton.dm.unipi.it/cgi-bin/astdys/astibo?objects:Orcus;main AstDys] orbital elements
* [http://hamilton.dm.unipi.it/cgi-bin/astdys/astibo?objects:Orcus;main AstDys] orbital elements
* [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Orcus;orb=1;view=Far Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=Orcus Ephemeris]
* [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Orcus;orb=1;view=Far Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=Orcus Ephemeris]
== References ==
== References ==
{{Reflist}}
{{Reflist}}