Moons of Eris

Moons of Haumea

The dwarf planet Haumea has two known moons.

Haumea's satellite system

The Haumean moons appear to be a collisional family, debris from a large impact of Haumea. Haumea appears to be almost entirely made of rock, with only a superficial layer of ice; most of the original icy mantle is thought to have been blasted off with the impact. There could therefore be a large number of moons smaller than Namaka and below current detection levels. At least Hiiaka appears to be composed of nearly pure water ice.

In the myth of Haumea, "Her many children sprang from different parts of her body." Thus the Haumean moons are named after Haumea's children.

Table of known moons

The Haumean moons are listed here by orbital period, from shortest to longest.

Name
(pronunciation)
Mean diameter (km) Mass (×1021 kg) Semi-major
axis (km)
Orbital period (days) Eccentricity Inclination Discovery date
Haumea II Namaka /nɑːˈmɑːkə/ ~170 km? ~0.08 ~39 000
if e = 0
34.7 ± 0.1
if e = 0
unknown 39 ± 6° from Hiiaka 2005
Haumea I Hiiaka /hiːʔiːˈɑːkə/ ~310 km ~0.4 49 500 ± 400 49.12 ± 0.03 0.050 ± 0.003 234.8 ±0.3° 2005

See also

Notes

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