めいおうせいがたてんたい 冥王星型天体
1. plutoid; ice dwarf; trans-Neptunian dwarf planetAstronomy, etc. term
Wikipedia definition
2. PlutoidA plutoid, or ice dwarf, is a trans-Neptunian dwarf planet: that is, a body orbiting beyond Neptune that is large enough to be rounded in shape. The term was adopted by the International Astronomical Union (IAU) working group Committee on Small Bodies Nomenclature, but has also been rejected by the IAU working group Planetary System Nomenclature. The term is not widely used by astronomers.
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