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90482 Orcus (view source)

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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.-->
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{{Infobox Planet   | bgcolour=#FFFFC0 | <!-- Scroll down to see the text of the article, below this table.-->
 
name=90482 Orcus
 
name=90482 Orcus
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| image=[[File:Orcus nasa.jpg|250px|NASA picture of 90482 Orcus]]
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| image=Orcus nasa.jpg
 
| 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]]
 
| alt_names=2004 DW
 
| alt_names=2004 DW
 
| mp_category=[[Plutino]]<ref name="Buie">{{cite web
 
| mp_category=[[Plutino]]<ref name="Buie">{{cite web
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|author=[[Marc W. Buie|Buie, Marc W.]]
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|author     = [[Marc W. Buie|Buie, Marc W.]]
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|date=2007-12-22
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|date       = 2007-12-22
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|title=Orbit Fit and Astrometric record for 90482
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|title       = Orbit Fit and Astrometric record for 90482
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|publisher=SwRI (Space Science Department)
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|publisher   = SwRI (Space Science Department)
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|url=http://www.boulder.swri.edu/~buie/kbo/astrom/90482.html
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|url         = http://www.boulder.swri.edu/~buie/kbo/astrom/90482.html
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|accessdate=2008-09-19| archiveurl = http://www.webcitation.org/65IF26P0R |archivedate = 2012-02-08| deadurl=no}}</ref>
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|accessdate = 2008-09-19
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|archiveurl = https://www.webcitation.org/65IF26P0R?url=http://www.boulder.swri.edu/~buie/kbo/astrom/90482.html
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|archivedate = 2012-02-08
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|url-status  = dead
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}}</ref>
 
| epoch=[[November 30]], [[2008]] ([[Julian day|JD]] 2&nbsp;454&nbsp;800)
 
| epoch=[[November 30]], [[2008]] ([[Julian day|JD]] 2&nbsp;454&nbsp;800)
 
| semimajor=5&nbsp;862.44 [[Giga|Gm]] (39.188 [[Astronomical unit|AU]])
 
| semimajor=5&nbsp;862.44 [[Giga|Gm]] (39.188 [[Astronomical unit|AU]])
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| avg_speed=4.68&nbsp;km/[[second|s]]
 
| avg_speed=4.68&nbsp;km/[[second|s]]
 
| satellites=1 (92-432&nbsp;km)
 
| satellites=1 (92-432&nbsp;km)
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| 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>
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| dimensions=946.3 {{±|74.1|72.3}} km (diameter)<ref name="Stansberry 2007">{{cite journal|last=Stansberry|first=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>
 
| mass=~7.5×10<sup>20</sup> [[kilogram|kg]]
 
| mass=~7.5×10<sup>20</sup> [[kilogram|kg]]
 
| density=~1.5&nbsp;g/[[cubic centimetre|cm³]] (assumed)
 
| density=~1.5&nbsp;g/[[cubic centimetre|cm³]] (assumed)
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| escape_velocity=~0.44&nbsp;km/s
 
| escape_velocity=~0.44&nbsp;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>
 
| 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>
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| 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>
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| 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. |date=2006-01-26 |archiveurl=https://www.webcitation.org/5TO84zdpq?url=http://www.physics.nau.edu/~tegler/research/survey.htm |archivedate=2007-11-16 |url-status=dead }}</ref>
 
| magnitude = 19.1 ([[Opposition (astronomy and astrology)|opposition]])<ref name="Horizons">{{cite web
 
| magnitude = 19.1 ([[Opposition (astronomy and astrology)|opposition]])<ref name="Horizons">{{cite web
 
|title=HORIZONS Web-Interface
 
|title=HORIZONS Web-Interface
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|publisher=[http://ssd.jpl.nasa.gov JPL Solar System Dynamics]
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|publisher=JPL Solar System Dynamics
 
|url=http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=Orcus
 
|url=http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=Orcus
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|accessdate=2008-07-02| archiveurl = http://www.webcitation.org/65IEzVrtJ |archivedate = 2012-02-08| deadurl=no}}</ref>
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|accessdate=2008-07-02
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|archiveurl=https://www.webcitation.org/65IEzVrtJ?url=http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1
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|archivedate=2012-02-08
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|url-status=live
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}}</ref>
 
| abs_magnitude=2.3<ref name="jpldata">{{cite web
 
| abs_magnitude=2.3<ref name="jpldata">{{cite web
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|date=2008-02-10 last obs
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|date=2008-02-10
 
|title=JPL Small-Body Database Browser: 90482 Orcus (2004 DW)
 
|title=JPL Small-Body Database Browser: 90482 Orcus (2004 DW)
 
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Orcus
 
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Orcus
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|accessdate=2008-07-02| archiveurl = http://www.webcitation.org/65IEzxEJN |archivedate = 2012-02-08| deadurl=no}}</ref>
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|accessdate=2008-07-02
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|archiveurl=https://www.webcitation.org/65IEzxEJN?url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Orcus
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|archivedate=2012-02-08
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|url-status=live
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}}</ref>
 
| albedo=19.75 {{±|3.40|2.76}} %
 
| albedo=19.75 {{±|3.40|2.76}} %
 
| single_temperature=~45 [[kelvin|K]]}}
 
| single_temperature=~45 [[kelvin|K]]}}
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'''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]].
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'''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.
    
== Moon ==
 
== Moon ==
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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.
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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>
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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>
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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&nbsp;km. It is thought to be a smaller KBO that was captured.
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Assuming an [[albedo]] similar to that of the primary, the magnitude suggests a diameter of about 220&nbsp;km. It is thought to be a smaller KBO that was captured.
      
== Other websites ==
 
== Other websites ==
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* [http://www.chadtrujillo.com/2004dw/ Chad Trujillo's page on 2004 DW]
 
* [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://news.bbc.co.uk/2/hi/science/nature/3506329.stm First BBC article]
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* [http://www.newscientist.com/news/news.jsp?id=ns99994702 First New Scientist article]
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* [https://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://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://hamilton.dm.unipi.it/cgi-bin/astdys/astibo?objects:Orcus;main AstDys] orbital elements
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