Haumea was [recognized] by the International Astronomical Union in 2008 and is one of five dwarf planets, alongside Pluto, Ceres, Eris and Makemake. They are located beyond Neptune – 50 times farther away from the sun than Earth.
Haumea, named after the Hawaiian goddess of childbirth, is unusual because of its elongated shape, comparable to a rugby ball, and its rapid rotation, spinning around once every 3.9 hours. Its diameter is approximately a third of the size of Earth’s moon.
“Dwarf planets are unique by themselves but Haumea is even more special among them,” said Ortiz “It also has two moons, a large and a small one, and the larger one turns out to be in the same plane as the ring we found.”