plutino
Astronomical term for a trans-Neptunian object in 2:3 orbital resonance with Neptune, like Pluto. Used in scientific contexts.
Plutinos are a group of celestial bodies in orbital resonance with Neptune.
冥王星 is Pluto itself, while 冥王星族 refers to the class of objects sharing Pluto's orbital resonance.
太陽系外縁天体 is a broader term for trans-Neptunian objects; 冥王星族 is a specific subgroup.
Compound of 冥王星 (Pluto) + 族 (tribe, family), literally 'Pluto family', referring to objects sharing Pluto's orbital characteristics.