Haumea dwarf planet

There exists a dwarf planet, Haumea, past the orbit of Neptune that is the fastest spinning planet or dwarf planet in our Solar System by far. Haumea is a third of the mass of Pluto but spins once every 3.5 hours on its axis. This speed puts a lot of stress on the dwarf planet and makes it look like an ellipsoid. It is spinning so fast that Haumea is twice as long as it is wide (like a lentil).