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Haumea
Haumea
Haumea in Celestia.
Designation
Other names 136108 Haumea
Pronounced h'aumeeua
Orbital Characteristics
Adjective Haumean
Aphelion 7.71087265 × 10 km (51.544 AU)
Semimajor axis 6.45245536 × 10 (43.132 AU AU)
Orbital Period 103,468 earth days (283.28 years)
Average orbital speed 10,030 mph (4.484 km/s, 16,141 km/h)
Satellites 2 (Namaka), (Hi'iaka)
Physical Characteristics
Surface area ≈2×107 km2
Volume Unknown
Mass (4.006 ± 0.040)×1021 kg (0.00066 Earths)
Axial tilt Unknown
Surface temperature (min) Unknown
Surface temperature (avg) Unknown
Surface temperature (mean) less than 50 K (-369 °F, -223 °C)
Surface temperature (max) Unknown
Other information
Population 0
Atmosphere
Surface Pressure Unknown
Composition Unknown
Habitable No, far too cold and too far away from the Sun.

Haumea (designated as 136108 Haumea) is a dwarf planet, located beyond Neptune's orbit. Just one-third the mass of Pluto, this dwarf planet was discovered in 2004 by a team headed by Mike Brown of Caltech at the Palomar Observatory in the United States. On September 17, 2008, it was recognized as a dwarf planet by the International Astronomical Union (IAU).

Haumea's extreme elongation makes it unique among known dwarf planets. Although its shape has not been directly observed, calculations from its light curve suggest it is an ellipsoid, with its major axis twice as long as its minor. Nonetheless, its gravity is believed sufficient for it to have relaxed into hydrostatic equilibrium, making it a dwarf planet. This elongation, along with its unusually rapid rotation, high density, and high albedo (from a surface of crystalline water ice), are thought to be the results of a giant collision, which left Haumea the largest member of a collisional family that includes several large trans-Neptunian objects (TNOs) and its two known moons, Hi'iaka and Namaka.

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