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[[sk:Hi'iaka]] |
[[sk:Hi'iaka]] |
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[[sl:Hi'iaka (luna)]] |
[[sl:Hi'iaka (luna)]] |
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[[sv:Hiʻiaka]] |
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| File:2003 EL61.jpg
Hiʻiaka is above Haumea (center) in this Keck telescope image.
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| Discovery | |
|---|---|
| Discovered by | Michael E. Brown, Chad Trujillo, David Rabinowitz, et al. |
| Discovery date | 2005 January 26 |
| Designations | |
| Haumea I | |
| Adjectives | Hiʻiakan |
| Orbital characteristics[1] | |
| 49 500 ± 400 km | |
| Eccentricity | 0.050 ± 0.003 |
| 49.12 ± 0.03 days | |
| Inclination | 234.8 ± 0.3° |
| Satellite of | Haumea |
| Physical characteristics | |
Mean radius | ~155 km |
| Mass | ~2×1019 kg (0.5% of Haumea) |
Mean density | (unknown; close to 1 if water ice) |
| (unknown) | |
| (unknown) | |
| Albedo | (unknown) |
| Temperature | 32 ± 3 K |
| 3.3 difference from primary's 17.3 | |
Hiʻiaka (Template:Pron-en,[2] or as in Hawaiian Error using {{IPA symbol}}:『ˈhiʔiˈjɐkə』not found in list), also known as Haumea I, is the larger, outer moon of the dwarf planet Haumea. Its provisional designation was S/2005 (2003 EL61) 1.
Hiʻiaka was the first satellite discovered around Haumea. It is named after one of the daughters of Haumea, Hiʻiaka, the patron goddess of the Big Island of Hawaii, though at first it had gone by the nickname "Rudolph" by its discovery team. It orbits once every 49.12 ± 0.03 days at a distance of 49,500 ± 400 km, with an eccentricity of 0.050 ± 0.003 and an inclination of 234.8 ± 0.3°. Mutual occultations occurred in 1999 and will not occur again until 2138.
Measured brightness is 5.9 ± 0.5% translating into the diameter about 22% of its primary, or in the range of 350 km, assuming similar albedo. To put this in perspective, this moon would be the fifth largest (cis-neptunian) asteroid after 1 Ceres, 2 Pallas, 4 Vesta, and 10 Hygiea if it were in the asteroid belt, as it can be seen in the list of largest known asteroids.
Only the total mass of the system is known, but assuming the moon has the same density and albedo as the primary, their magnitude difference (3.3) can be used to estimate the mass of the satellite as 1% of the mass of Haumea.
{{cite web}}: Unknown parameter |updated= ignored (help)
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