A dwarf planet is a planetar-mass object that is neither a planet nor a naitural satellite. That is, it is in direct orbit o the Sun, an is massive enough for its gravity tae crush itsel intae a hydrostatic equilibrium shape (uisually a spheroid), but haes nae cleared the neighbourhuid o ither material aroond its orbit.[1][2]

Ceres, the only dwarf planet in the asteroid belt imaged by Dawn Pluto seen by New Horizons on 14 July 2015
|-Eris and its moon seen from HubbleMakemake and its moon imaged by the Hubble Telescope      
Four notable dwarf planets (clockwise from top left):

(See full leet o likeliest possible dwarf planets.)


  1. "Definition of a Planet in the Solar System: Resolutions 5 and 6" (PDF). IAU 2006 General Assembly. International Astronomical Union. 2006-08-24. Retrieved 2008-01-26.
  2. "IAU pdf" (PDF).