Hiʻiaka (moon)
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 49880±198 km, with an eccentricity of 0.0513±0.0078 and an inclination of 126.356±0.064°. Assuming its estimated diameter of over 300 km is accurate, it may be the fourth- or fifth-largest known moon of a Trans-Neptunian object, after Pluto I Charon, Eris I Dysnomia, Orcus I Vanth, and possibly Varda I Ilmarë and Salacia I Actaea.
In this series of photos taken by the Hubble Space Telescope, the brighter object Hiʻiaka is seen orbiting Haumea (center). | |
| Discovery | |
|---|---|
| Discovered by | Michael E. Brown, Chad Trujillo, David Rabinowitz, et al. |
| Discovery date | 26 January 2005 |
| Designations | |
Designation | Haumea I |
| Pronunciation | /hiːʔiˈɑːkə/ Hawaiian: [ˈhiʔiˈjɐkə] |
Alternative names | (136108) 2003 EL61 I S/2005 (2003 EL61) 1 |
| Orbital characteristics | |
Semi-major axis | 49880±198 km |
| Eccentricity | 0.0513±0.0078 |
Orbital period (sidereal) | 49.12±0.03 d |
Mean anomaly | 152.8°±6.1° |
| Inclination | 126.356±0.064° |
Longitude of ascending node | 206.766°±0.033° |
| 154.1°±5.8° | |
| Satellite of | Haumea |
| Physical characteristics | |
Mean radius | ~160 km |
| Mass | (1.79±0.11)×1019 kg (0.45% of Haumea) |
Mean density | ~1 g/cm3 |
Synodic rotation period | ~9.8 h |
| Albedo | 0.8±0.07 |
| Temperature | 32±3 K |
| 20.3 (3.0 difference from primary's 17.3) | |
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