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In 2006, the International Astronomical Union settled the issue. They determined that Eris was not a planet, and neither was Pluto. But the criteria they set also provoked yet another reassessment of the status of [[Ceres]], the largest and first-discovered object in the [[asteroid]] belt. Upon consideration, the IAU declared that Ceres was a dwarf planet as well.
In 2006, the International Astronomical Union settled the issue. They determined that Eris was not a planet, and neither was Pluto. But the criteria they set also provoked yet another reassessment of the status of [[Ceres]], the largest and first-discovered object in the [[asteroid]] belt. Upon consideration, the IAU declared that Ceres was a dwarf planet as well.
Today the list of dwarf planets is limited to these three: Eris, Pluto, and Ceres.
Today the list of dwarf planets is limited to these five: Ceres, Pluto, Haumea, Makemake and Eris.
== Table ==
== Table ==
| 0.218% earth
| 0.218% earth
| -6.387 da
| -6.387 da
|-
| [[Haumea]]
| 29.66 AU
| 35.164 AU
| 0.18874
|
| 28.19°
| 4.2 ± 0.1)×10<sup>21</sup> kg
| Unknown
|-
| [[Makemake]]
| 38.509 AU
| 53.074 AU
| 0.159
| 309.88 a
| Unknown
| ~4 × 10<sup>21</sup> kg
| Unknown
|-
|-
| [[Eris]]
| [[Eris]]
| 0.333 da
| 0.333 da
|}
|}
==Plutoids==
The name '''plutoid''' was proposed by the members of the IAU Committee on Small Body Nomenclature (CSBN), to describe celestial bodies "in orbit around the Sun at a semi-major axis greater than that of Neptune that have sufficient mass for their self-gravity to overcome rigid body forces so that they assume a hydrostatic equilibrium (near-spherical) shape, and that have not cleared the neighborhood around their orbit." <ref>http://solarsystem.nasa.gov/planets/profile.cfm?Object=Dwarf&Display=OverviewLong</ref>
The four known and named plutoids are Pluto, Haumea, Makemake and Eris.
It is important to note that while all plutoids are dwarf planets, not all dwarf planets are plutiods. Ceres, for example, is a dwarf planet, but not a plutoid, as its orbit lies well within that of Neptune.
== References ==
== References ==
* [[Pluto]]
* [[Pluto]]
* [[Ceres]]
* [[Ceres]]
* [[Haumea]]
* [[Makemake]]
[[Category:Dwarf planets]]
[[Category:Dwarf planets]]