Haumea's name was approved Wednesday by the International Astronomical Union in Paris.
It is the solar system's fifth dwarf planet, in the same category and region as Pluto.
Haumea is shaped like an elongated egg. Astronomers think its shape comes from its rapid rotation, which could have been caused by a collision with another object billions of years ago.
Haumea was discovered in 2005.
The other dwarf planets include Ceres, Pluto, Eris and Makemake.
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