About Haumea
Haumea is one of the most peculiar objects in the outer Solar System. Its extreme rotation period — just under 4 hours — has deformed its shape into a triaxial ellipsoid, with the long axis ~2,322 km and the short axis about 1,026 km. Haumea has two known moons (Hi’iaka and Namaka), both believed to have formed from a giant impact that also set Haumea spinning and launched fragments that together form the “Haumean collisional family” of KBOs. In 2017, a stellar-occultation campaign revealed the first ring system known around any dwarf planet.
Physical Properties
Orbit
Ring System
One narrow ring discovered in 2017 via stellar occultation — first ring system known around a dwarf planet.
Notable Moons
Gallery
Hand-picked mission imagery of Haumea sourced from NASA and partner archives. Click any photo for full resolution and source attribution.
Imagery on this page is provided by the original mission teams. Full attribution terms: Image Rights & Credits.
Sources & Further Reading
- NASA — official mission / factsheet page
- Wikipedia — extensive cross-referenced article
- NASA u2014 Haumea
- Ortiz et al., Nature 2017 u2014 The size, shape, density and ring of the dwarf planet Haumea (2017)
Numerical values (radius, mass, orbital elements, temperatures) are drawn from NASA NSSDC Planetary Fact Sheets, JPL Horizons, and the JPL Small-Body Database. Last refreshed: 2026-06-08 01:37:02.