根據國際天文學組合 (IAU) 2006年的定義 [1]矮惑星(é-hi̍k-tshenn,英文:dwarf planet)是一款有合下跤條件的星體 (celestial body):

  1. 有踅日頭
  2. 質量有夠予伊家己的引力壓過(rigid body forces),戴著伊變成(hydrostatic equilibrium)的形(倚球形);
  3. 無甲伊的軌道附近清清氣;
  4. 毋是衛星。

IAU 目前甲今承認四粒矮惑星:Ceres、冥王星、 Makemake、Eris.

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