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It is the outer and, at roughly 310 km in diameter, the larger and brighter of the two, and orbits Haumea in a nearly circular path every 49 days. [68] Strong absorption features at 1.5 and 2 micrometres in the infrared spectrum are consistent with nearly pure crystalline water ice covering much of the surface. [ 69 ]
Hubble image of Haumea (center), Hiʻiaka (above), and Namaka (below). Hiʻiaka is the outer and, at roughly 310 km in diameter, the larger and brighter of the two moons. [9] Strong absorption features observed at 1.5, 1.65 and 2 μm in its infrared spectrum are consistent with nearly pure crystalline water ice covering much of its surface. The ...
Collisional formation of the family requires a progenitor some 1660 km in diameter, with a density of ~2.0 g/cm 3, similar to Pluto and Eris. During the formational collision, Haumea lost roughly 20% of its mass, mostly ice, and became denser.
This suggests that the threshold for dwarf planethood in the trans-Neptunian region is a diameter of ~1000 km (thus including only Pluto, Eris, Haumea, Makemake, Gonggong, Quaoar and possibly Sedna). [ 4 ]
However, because 2002 TX 300 is a member of the Haumea family, it is more likely to have a high albedo of around 0.7, which would result in a diameter of about 360 kilometres (220 mi). [15] 2002 TX 300 occulted a relatively bright apparent magnitude 13.1 star in the constellation of Andromeda on 9 October 2009. [16]
Hiʻiaka is the larger, outer moon of the trans-Neptunian dwarf planet Haumea. It is named after one of the daughters of Haumea, Hiʻiaka, the patron goddess of the Big Island of Hawaii. It orbits once every 49.12 ± 0.03 d at a distance of 49 880 ± 198 km, with an eccentricity of 0.0513 ± 0.0078 and an inclination of 126.356 ± 0.064°.
As a member of the Haumea family, (308193) 2005 CB 79 is suspected of being an icy mantle collisional fragment from dwarf planet Haumea.With an absolute magnitude (H) of 4.7, [4] and a Haumea-family albedo of 0.7, this object would have a diameter of 158 km. [7]
It measures approximately 310 kilometers (190 miles) in diameter. It was discovered on 10 February 1999, ... 1999 CD 158 is a candidate member of the Haumea family, ...