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Beyond Jupiter, The World of Distant Minor Planets: (136108) HaumeaJOA 2019, Vol. 9, No. 3, Page 22 Author(s): Mike Kretlow
Abstract: Haumea is one of the four currently known dwarf planets beyond Neptune. Haumea's mass was estimated to be about 1/3rd of Pluto's mass. Two moons were discovered so far. Due to the short rotation period (~ 4h) the dwarf planet is distorted into a triaxial Jacobi ellipsoid. A stellar occultationin 2017 revealed a ring, the first discovery for a TNO and the second discovery for an object not being a (giant) planet, after the discovery of a ring system around the Centaur (10199) Chariklo in 2013, also by a stellar occultation. From these 2017 occultation observations the physical dimensions (2322 x 1704 x 1026) km were modelled for a triaxial ellipsoid, placing Haumea among the largest trans-Neptunianobjects discovered so far (after Pluto and Eris).