Pluto is a Plutoid

Pluto was a planet, before 24 Aug 2006.

Then it was demoted on that day, to a dwarf planet.

Now the International Astronomical Union (IAU) has decided on a new name for dwarf planets like Pluto – the Plutoids.


Plutoids are celestial bodies in orbit around the Sun and further away than Neptune and assume a near-spherical shape and have not cleared the neighbourhood around their orbit.

Plutoids’ moons are not plutoids, even if they are a sphere.

Currently the members are Pluto and Eris. Ceres, another dwarf planet, is not a plutoid because it doesn’t locate beyond Neptune. It is located between Mars and Jupiter in the asteroid belt.

Plutoid… what a name! Why not “Erisoid”, since Eris is the larger of the two.



~ by thChieh on June 12, 2008.

One Response to “Pluto is a Plutoid”

  1. […] also a trans-Neptunian object, it is also been officially classifed as a dwarf planet, and also a plutoid as well. It is the fourth member of the dwarf planet category after Pluto, Eris and Ceres, and the […]

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