Astrophysics (Index)About

plutoid

(ice dwarf)
(Pluto-like dwarf planet)

A plutoid (or ice dwarf, a term more common within science) is a Pluto-like dwarf planet, i.e., icy, round, a trans-Neptunian object (orbits beyond Neptune) and a KBO (Kuiper Belt object). In addition to Pluto, the known examples are Eris, Haumea, and Makemake.

A similar term, plutino is defined as "any size or composition", but like Pluto, in a 3:2 orbital resonance with Neptune and a twotino is like a plutino except that its resonance is 2:1. Other than Pluto, they are all small objects. Estimates are there are thousands of plutinos.


(planets,solar system,object type)
Further reading:
http://en.wikipedia.org/wiki/Plutoid
http://en.wikipedia.org/wiki/Plutino

Referenced by pages:
solar system

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