Size, mass and density Eris (dwarf planet)

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artistic comparison of pluto, eris, makemake, haumea, sedna, 2002 ms4, 2007 or10, quaoar, salacia, orcus, , earth along moon.




this makes eris around same size pluto, 7006237200000000000♠2372±4 km across. indicates albedo of 0.96, higher of other large body in solar system except enceladus. speculated high albedo due surface ices being replenished because of temperature fluctuations eris s eccentric orbit takes closer , farther sun.


in 2007, series of observations of largest trans-neptunian objects spitzer space telescope gave estimate of eris s diameter of 7006260000000000000♠2600+400

−200 km. spitzer , hubble estimates overlap in range of 2,400–2,500 km, 4–8% larger pluto. astronomers suspect eris s spin axis pointing toward sun, make sunlit hemisphere warmer average , skew infrared measurements toward higher values. outcome 2010 chile occultation more in line hubble result 2005.


in november 2010, eris subject of 1 of distant stellar occultations yet earth. preliminary data event cast doubt on previous size estimates. teams announced final results occultation in october 2011, estimated diameter of 7006232600000000000♠2326+6

−6 km. mass of eris can calculated greater precision. based on accepted value dysnomia s period—15.774 days— eris 27 percent more massive pluto. if 2011 occultation results used, eris has density of 7003252000000000000♠2.52±0.07 g/cm, substantially denser pluto, , must composed largely of rocky materials.


models of internal heating via radioactive decay suggest eris have internal ocean of liquid water @ mantle–core boundary.


in july 2015, after ten years of eris being considered ninth-largest object known directly orbit sun, close-up imagery new horizons mission more accurately determined pluto s volume larger eris s, rather smaller thought. eris tenth-largest object known directly orbit sun volume, though not mass.





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