Ceres
type: Concept
broader: Dwarf planets

Dwarf planets
type: Concept
contributor: AAS Frey.Katie Admin
contributor: AAS Frey.Katie
example: Eris
example: Makemake
alternative label: Dwarf planets (Solar system)
alternative label: Solar system dwarf planets
modified: 2020-10-27T13:51:27.409Z
modified: 2020-12-16T20:28:20.647Z
narrower: Ceres
narrower: Pluto
broader: Solar system
definition: A new category of astronomical objects in the solar system introduced in a resolution by the 26th General Assembly of the International Astronomical Union (IAU) on August 24, 2006. The characterizing properties are as follows: 1) It is in orbit around the Sun; 2) It has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape; 3) It has not 'cleared the neighbourhood' around its orbit; and 4) It is not a satellite of a planet, or other non-stellar body. The property 3 reclassified Pluto from a planet to a dwarf planet because it has not cleared the neighborhood of its orbit (the Kuiper Belt). The largest known dwarf planets are: Eris, Pluto, Ceres, Makemake, and 2015 RR245.

Pluto
type: Concept
broader: Dwarf planets

Solar system
type: Concept
narrower: Dwarf planets