|
| caption = Eris (centre) and [[Dysnomia (moon)|Dysnomia]] (left of centre).<br />[[Hubble Space Telescope]]
| discovery = yes
| discoverer = [[Michael E. Brown|M. E. Brown]],<br/>[[Chad Trujillo|C. A. Trujillo]],<br/>[[David L. Rabinowitz|D. L. Rabinowitz]]<ref name="discovery">{{Cite web
| discovered = January 5, 2005<ref name="New Planet"/>
| author=Staff
| date=2007-05-01
| url=http://www.minorplanetcenter.org/iau/lists/NumberedMPs.html
| title=Discovery Circumstances: Numbered Minor Planets
| publisher=IAU: Minor Planet Center
| accessdate=2007-05-05 }}</reference> ▼| discovered = January 5, 2005<ref name="New Planet"/>{{Ref_label|G|g|none}}<!--The date given by the IAU, 21 October 2003, is not the discovery date by the observation date of the discovery images.-->
| mp_name = '''136199 Eris'''
| note = yes
| alt_names = {{mp|2003 UB|313}}<ref name=jpldata/>
| named_after = [[Eris (mythology)|Eris]]
| mp_category = [[dwarf planet]],<br />[[Trans-Neptunian object|TNO]],<br />[[plutoid]],<br /> and [[scattered disc|SDO]]<ref name=MPC>{{Cite web
| epoch = March 6, 2006<br />([[Julian day|JD]] 2453800.5)
|title=List Of Centaurs and Scattered-Disk Objects
|publisher=Minor Planet Center
|url=http://www.minorplanetcenter.org/iau/lists/Centaurs.html
|accessdate=2008-09-10}}</ref><ref name=Buie/>
| orbit_ref = <ref name=jpldata>{{Cite web
|date=2009-11-20 last obs
|title=JPL Small-Body Database Browser: 136199 Eris (2003 UB313)
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Eris
|accessdate=2009-01-21}}</reference>
| epoch = March 6, 2006<br />([[Julian day|JD]] 2453800.5)<ref><!---[http://hamilton.dm.unipi.it/cgi-bin/astdys/astibo?list_objects:0;main AstDyS database] ---> [http://asteroid.lowell.edu/ Asteroid Observing Services]<!--- Actual page is ftp://ftp.lowell.edu/pub/elgb/astorb.html ---></ref>
| aphelion = 97.56 [[Astronomical unit|AU]]<br />14.60{{e|9}} km
| perihelion = 37.77 AU <br />5.65{{e|9}} km
| satellites=[[Dysnomia (moon)|Dysnomia]]
| physical_characteristics = yes
| mean_radius = {{nowrap|1300{{±|200|100}} km<small> (2007)<ref name=spitzer>
{{Cite web
|title=Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope
| work=University of Arizona, Lowell Observatory, California Institute of Technology, NASA Ames Research Center, Southwest Research Institute, Cornell University
|id={{arxiv|astro-ph/0702538}}
▲ | year=2007|accessdate=2007-05- 05 18}} </reference>
|year=2007|accessdate=2007-05-18}}</ref>}}</br><small>Preliminary:</small> ≤1170<small> (2010)</small><ref name=beatty>[http://www.newscientist.com/article/dn19697-former-tenth-planet-may-be-smaller-than-pluto.html Kelly Beatty – '''Former 'tenth planet' may be smaller than Pluto''' (November 2010) – SkyandTelescope.com/newscientist.com]</reference>
| mass = {{nowrap|(1.67±0.02){{e|22}} kg<ref name=mass>{{Cite<br journal/>
|title=The Mass of Dwarf Planet Eris
|author=[[Michael E. Brown]] and Emily L. Schaller
|journal=Science
|year=2007
|volume=316 |issue=5831
|doi=10.1126/science.1139415
|url=http://www.sciencemag.org/cgi/content/abstract/316/5831/1585| pages=1585
|pmid=17569855
|format=abstract page }}</reference>}}<br />
0.002 [[Earth mass|Earths]]
| surface_area = 78,500,000 sq km (48,777,638.6 sq mi)
| density= 2.25–2.5 g/cm<sup>3</sup><ref name="KBeatty">{{cite web
|date=2010-11-07
|title=Eris Gets Dwarfed (Is Pluto Bigger?)
|publisher=Sky & Telescope (News Blog)
|author=Kelly Beatty
|url=http://www.skyandtelescope.com/community/skyblog/newsblog/106861063.html
|accessdate=2010-11-07}}</reference>
| surface_grav = ~0.8 [[Acceleration|m/s<sup>2</sup>]]
| sidereal_day = 25.9 ± 8 hr<ref name=jpldata/>
| mean_temp_1 = 42.5 K
| max_temp_1 = 55 K
| spectral_type = [[Trans-Neptunian_object#Colors|B-V]]=0.78, V-R=0.45<ref name="Snodgrass2009">{{Cite journal|author=Snodgrass, Carry, Dumas, Hainaut |title=Characterisation of candidate members of (136108) Haumea's family |journal=The [[Astrophysical Journal]] |format=abstract |date=16 December 2009|id={{arXiv|0912.3171}}}}</reference>
| magnitude = 18.7<ref name=AstDys>{{Cite web
|title=AstDys (136199) Eris Ephemerides
|publisher=Department of Mathematics, University of Pisa, Italy
|url=http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.0&n=Eris
|accessdate=2009-03-16}}</ref>
| abs_magnitude = −1.19 ± 0.3<ref name=jpldata/>
| angular_size = 40 [[milliarcsecond|milli-arcsec]]<ref name="nature"/>
| 