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(Top) 1 Discovery and naming 2 Size and brightness 3 Mass 4 See also 5 References 6 External links

Hiʻiaka (moon)

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Hiʻiaka
Discovery
File:2003 EL61.jpg Hiʻiaka is above Haumea (center) in this Keck telescope image.
Discovered by	Michael E. Brown, Chad Trujillo, David Rabinowitz, et al.
Discovery date	26 January 2005
Designations
Designation	Haumea I Hiʻiaka
Pronunciation	/ˌhiːʔiˈɑːkə/,^[1] or as in Hawaiian [ˈhiʔiˈjɐkə]
Alternative names	(136108) 2003 EL61 I, S/2005 (2003 EL₆₁) 1
Orbital characteristics^[2]
Semi-major axis	49 880 ± 198 km
Eccentricity	0.0513 ± 0.0078
Orbital period (sidereal)	49.12 ± 0.03 days
Inclination	126.356 ± 0.064°
Satellite of	Haumea
Physical characteristics
Mean radius	~155 km
Mass	1.79 ± 0.11×10¹⁹ kg^[2] (0.45% of Haumea)
Mean density	(unknown; close to 1 if water ice)
Synodic rotation period	(unknown)
Axial tilt	(unknown)
Albedo	(unknown)
Temperature	32 ± 3 K
Apparent magnitude	3.3 difference from primary's 17.3

Hiʻiaka is the larger, outer moon of the dwarf planet Haumea.

Discovery and naming

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 49,880 ± 198 km, with an eccentricity of 0.0513 ± 0.0078 and an inclination of 126.356 ± 0.064°. Mutual events expected in July 2009 should improve the knowledge of the orbits and masses of the Haumea system.^[2]

Size and brightness

Its 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.

Mass

The mass of Hiʻiaka is estimated to be 1.79 ± 0.11×10¹⁹ kg^[2] using precise relative astrometry from Hubble Telescope and Keck Telescope and applying 3-body, point-mass model to the Haumea system.

References

^ In US dictionary transcription, Template:USdict.

^ ^a ^b ^c ^d D. Ragozzine, M. E. Brown Orbits And Masses Of The Satellites Of The Dwarf Planet Haumea = 2003 EL61, To appear in The Astronomical Journal (2009) Preprint on arXiv