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{{Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0 | <!-- Scroll down to see the text of the article, below this table.-->
name=90482 Orcus
| image=[[File:Orcus nasa.jpg|250px|NASA picture of 90482 Orcus]]
| discoverer=[[Michael E. Brown|M. Brown]],<br />[[Chad Trujillo|C. Trujillo]],<br />[[David L. Rabinowitz|D. Rabinowitz]]
| discovered=[[February 17]], [[2004]]
| alt_names=2004 DW
| mp_category=[[Plutino]]<ref name="Buie">{{cite web
|author=[[Marc W. Buie|Buie, Marc W.]]
|date=2007-12-22
|title=Orbit Fit and Astrometric record for 90482
|publisher=SwRI (Space Science Department)
|url=http://www.boulder.swri.edu/~buie/kbo/astrom/90482.html
|accessdate=2008-09-19| archiveurl = http://www.webcitation.org/65IF26P0R |archivedate = 2012-02-08| deadurl=no}}</ref>
| epoch=[[November 30]], [[2008]] ([[Julian day|JD]] 2 454 800)
| semimajor=5 862.44 [[Giga|Gm]] (39.188 [[Astronomical unit|AU]])
| perihelion=4 535.80 Gm (30.32 AU)
| aphelion=7 188.17 Gm (48.05 AU)
| eccentricity=0.226 18
| period=89 606 [[day|d]] (245.33 [[Julian year (astronomy)|yr]])
| inclination=20.593[[degree (angle)|°]]
| asc_node=268.722°
| arg_peri=72.474°
| mean_anomaly=164.68°
| avg_speed=4.68 km/[[second|s]]
| satellites=1 (92-432 km)
| dimensions=946.3 {{±|74.1|72.3}} km (diameter)<ref name="Stansberry 2007">{{cite journal|last=Stansberry|first=J.| coauthors=Grundy, W.; Brown, M.; ''et al.''|title=Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope|url=http://arxiv.org/abs/astro-ph/0702538v1|year=2007}}</ref>
| mass=~7.5×10<sup>20</sup> [[kilogram|kg]]
| density=~1.5 g/[[cubic centimetre|cm³]] (assumed)
| surface_grav=~0.2 m/s²
| escape_velocity=~0.44 km/s
| rotation=13.19h<ref name="BBC h2g2">{{cite web |url=http://www.bbc.co.uk/dna/h2g2/A32537720 |title=Overlooked dwarf planet candidates |accessdate=2008-07-25 |publisher=BBC |date=2008-02-19 }}</ref>
| spectral_type=B-V=0.68; V-R=0.37 <ref>{{cite web|url=http://www.physics.nau.edu/~tegler/research/survey.htm |title=Kuiper Belt Object Magnitudes and Surface Colors |accessdate=2006-11-05 |last=Tegler |first=Stephen C. |coauthors= |date=2006-01-26| archiveurl = http://www.webcitation.org/5TO84zdpq | archivedate = 2007-11-16| deadurl=no}}</ref>
| magnitude = 19.1 ([[Opposition (astronomy and astrology)|opposition]])<ref name="Horizons">{{cite web
|title=HORIZONS Web-Interface
|publisher=[http://ssd.jpl.nasa.gov JPL Solar System Dynamics]
|url=http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=Orcus
|accessdate=2008-07-02| archiveurl = http://www.webcitation.org/65IEzVrtJ |archivedate = 2012-02-08| deadurl=no}}</ref>
| abs_magnitude=2.3<ref name="jpldata">{{cite web
|date=2008-02-10 last obs
|title=JPL Small-Body Database Browser: 90482 Orcus (2004 DW)
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Orcus
|accessdate=2008-07-02| archiveurl = http://www.webcitation.org/65IEzxEJN |archivedate = 2012-02-08| deadurl=no}}</ref>
| albedo=19.75 {{±|3.40|2.76}} %
| single_temperature=~45 [[kelvin|K]]}}
'''90482 Orcus''', originally known by the [[provisional designation]] '''2004 DW''') is a [[Kuiper belt]] object (KBO) and could be 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]].
== Moon ==
A moon of Orcus was found on [[22 February]] [[2007]].<ref>[http://www.johnstonsarchive.net/astro/astmoons/am-90482.html (90482) Orcus and Vanth] {{WebCite|url=http://www.webcitation.org/65IF3ZmvN|date =2012-02-08}}</ref> The orbit of this moon has yet to be found out.
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.
== 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/K04D13.html MPEC 2004-D13] correcting MPEC 2004-D09
* [http://www.chadtrujillo.com/2004dw/ Chad Trujillo's page on 2004 DW]
* [http://news.bbc.co.uk/2/hi/science/nature/3506329.stm First BBC article]
* [http://www.newscientist.com/news/news.jsp?id=ns99994702 First New Scientist article]
* [http://www.lowell.edu/users/buie/kbo/astrom/90482.html Updated orbital elements from Lowell Observatory]
* [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]
== References ==
{{Reflist}}
{{MinorPlanets Navigator|90481 Wollstonecraft|(90483) 2004 DM4}}
{{MinorPlanets_Footer}}
{{DEFAULTSORT:Orcus}}
[[Category:Possible dwarf planets]]
[[Category:Kuiper belt objects]]
name=90482 Orcus
| image=[[File:Orcus nasa.jpg|250px|NASA picture of 90482 Orcus]]
| discoverer=[[Michael E. Brown|M. Brown]],<br />[[Chad Trujillo|C. Trujillo]],<br />[[David L. Rabinowitz|D. Rabinowitz]]
| discovered=[[February 17]], [[2004]]
| alt_names=2004 DW
| mp_category=[[Plutino]]<ref name="Buie">{{cite web
|author=[[Marc W. Buie|Buie, Marc W.]]
|date=2007-12-22
|title=Orbit Fit and Astrometric record for 90482
|publisher=SwRI (Space Science Department)
|url=http://www.boulder.swri.edu/~buie/kbo/astrom/90482.html
|accessdate=2008-09-19| archiveurl = http://www.webcitation.org/65IF26P0R |archivedate = 2012-02-08| deadurl=no}}</ref>
| epoch=[[November 30]], [[2008]] ([[Julian day|JD]] 2 454 800)
| semimajor=5 862.44 [[Giga|Gm]] (39.188 [[Astronomical unit|AU]])
| perihelion=4 535.80 Gm (30.32 AU)
| aphelion=7 188.17 Gm (48.05 AU)
| eccentricity=0.226 18
| period=89 606 [[day|d]] (245.33 [[Julian year (astronomy)|yr]])
| inclination=20.593[[degree (angle)|°]]
| asc_node=268.722°
| arg_peri=72.474°
| mean_anomaly=164.68°
| avg_speed=4.68 km/[[second|s]]
| satellites=1 (92-432 km)
| dimensions=946.3 {{±|74.1|72.3}} km (diameter)<ref name="Stansberry 2007">{{cite journal|last=Stansberry|first=J.| coauthors=Grundy, W.; Brown, M.; ''et al.''|title=Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope|url=http://arxiv.org/abs/astro-ph/0702538v1|year=2007}}</ref>
| mass=~7.5×10<sup>20</sup> [[kilogram|kg]]
| density=~1.5 g/[[cubic centimetre|cm³]] (assumed)
| surface_grav=~0.2 m/s²
| escape_velocity=~0.44 km/s
| rotation=13.19h<ref name="BBC h2g2">{{cite web |url=http://www.bbc.co.uk/dna/h2g2/A32537720 |title=Overlooked dwarf planet candidates |accessdate=2008-07-25 |publisher=BBC |date=2008-02-19 }}</ref>
| spectral_type=B-V=0.68; V-R=0.37 <ref>{{cite web|url=http://www.physics.nau.edu/~tegler/research/survey.htm |title=Kuiper Belt Object Magnitudes and Surface Colors |accessdate=2006-11-05 |last=Tegler |first=Stephen C. |coauthors= |date=2006-01-26| archiveurl = http://www.webcitation.org/5TO84zdpq | archivedate = 2007-11-16| deadurl=no}}</ref>
| magnitude = 19.1 ([[Opposition (astronomy and astrology)|opposition]])<ref name="Horizons">{{cite web
|title=HORIZONS Web-Interface
|publisher=[http://ssd.jpl.nasa.gov JPL Solar System Dynamics]
|url=http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=Orcus
|accessdate=2008-07-02| archiveurl = http://www.webcitation.org/65IEzVrtJ |archivedate = 2012-02-08| deadurl=no}}</ref>
| abs_magnitude=2.3<ref name="jpldata">{{cite web
|date=2008-02-10 last obs
|title=JPL Small-Body Database Browser: 90482 Orcus (2004 DW)
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Orcus
|accessdate=2008-07-02| archiveurl = http://www.webcitation.org/65IEzxEJN |archivedate = 2012-02-08| deadurl=no}}</ref>
| albedo=19.75 {{±|3.40|2.76}} %
| single_temperature=~45 [[kelvin|K]]}}
'''90482 Orcus''', originally known by the [[provisional designation]] '''2004 DW''') is a [[Kuiper belt]] object (KBO) and could be 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]].
== Moon ==
A moon of Orcus was found on [[22 February]] [[2007]].<ref>[http://www.johnstonsarchive.net/astro/astmoons/am-90482.html (90482) Orcus and Vanth] {{WebCite|url=http://www.webcitation.org/65IF3ZmvN|date =2012-02-08}}</ref> The orbit of this moon has yet to be found out.
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.
== 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/K04D13.html MPEC 2004-D13] correcting MPEC 2004-D09
* [http://www.chadtrujillo.com/2004dw/ Chad Trujillo's page on 2004 DW]
* [http://news.bbc.co.uk/2/hi/science/nature/3506329.stm First BBC article]
* [http://www.newscientist.com/news/news.jsp?id=ns99994702 First New Scientist article]
* [http://www.lowell.edu/users/buie/kbo/astrom/90482.html Updated orbital elements from Lowell Observatory]
* [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]
== References ==
{{Reflist}}
{{MinorPlanets Navigator|90481 Wollstonecraft|(90483) 2004 DM4}}
{{MinorPlanets_Footer}}
{{DEFAULTSORT:Orcus}}
[[Category:Possible dwarf planets]]
[[Category:Kuiper belt objects]]