Haumea (pronounced how-may-a) is a rugby ball-shaped dwarf planet that was discovered in December 2004.
It's around one-third the mass of Pluto. We've never taken close observations of Haumea, but because of the way it reflects sunlight astronomers think that it's shaped like a rugby ball, with one of its axes twice as long as the other. The odd shape is caused by its very fast rotation rate - it spins once every 4 hours.
Haumea has two known moons, named Hiʻiaka and Namaka, and the surface temperature on all three is thought to be around -240°C (or 32K).
Haumea is also a type of plutoid - a dwarf planet that circles the Sun beyond the orbit of Neptune.