Haumea
Haumea, is a dwarf planet in the Kuiper belt. Its mass is one-third the mass of Pluto. Until it was given a permanent name, the Caltech discovery team used the nickname "Santa" among themselves, as they had discovered Haumea on December 28, 2004, just after Christmas. Two small satellites have been discovered orbiting Haumea, (136108) Haumea I Hiʻiaka and Haumea II Namaka