File:Namaka_Hubble.png · Wikimedia Commons · See Wikimedia Commons
Namaka
Sign in to saveAlso known as Haumea II, (136108) 2003 EL61 II, S/2005 (2003 EL61) 2
moon of Haumea
Key facts
- Discovered by
- Michael E. Brown Keck Observatory adaptive optics team
- Discovery site
- W. M. Keck Obs. , Mauna Kea
- Designation
- (136108) Haumea II
- Pronunciation
- / n ɑː ˈ m ɑː k ə / , Hawaiian: [ naːˈmɐkə ]
- Named after
- Nāmaka
- Alternative names
- S/2005 ( 2003 EL 61 ) 2 , S/2005 (136108) 2
- Semi major axis
- 25 506 ± 36 km
- Eccentricity
- 0.2179 +0.0033, −0.0032
- Orbital period sidereal
- 18.2783 ± 0.0076 d
- Mean anomaly
- 185.19 ° +0.69 ° , −0.65 °
- Inclination
- 69.005° +0.108°, −0.107° (to ecliptic ) 12.79° +1.01°, −0.58° (to Haumea's equator) 13.2° ± 0.2° (to Hiʻiaka 's orbital plane )
- Longitude of ascending node
- 23.725° +0.149°, −0.150° (to ecliptic )
- Argument of periapsis
- 118.35° +0.39°, −0.42°
- Satellite of
- Haumea
- Mean diameter
- 150 ± 50 km , ≥ 83 ± 2 km ( occultation )
- Mass
- (1.18 ± 0.25) × 10 kg
- Mean density
- ~ 0.65 g/cm (for 150 km diameter)
- Synodic rotation period
- unknown, likely chaotic
via Wikipedia infobox
Wikidata facts
- Diameter
- 83
- Radius
- 80
- Mass
- 1790000000000000000
- Orbital period
- 18.2783
- Image
- Namaka Hubble.png
Show 14 more facts
- apoapsis
- 32046
- density
- 1.0
- provisional designation
- S/2005 (2003 EL61) 2
- time of discovery or invention
- 2005-06-30
- orbital eccentricity
- 0.249
- semi-major axis of an orbit
- 25657
- orbital inclination
- 113.013
- albedo
- 0.80
- temperature
- 32
- apparent magnitude
- 4.6
- Commons category
- Namaka (moon)
- longitude of ascending node
- 23.725
- absolute magnitude
- 5.1
- periapsis
- 19268
via Wikidata · CC0
~11 min read
Article
Namaka (full designation (136108) Haumea II) is the smaller, inner moon of the trans-Neptunian dwarf planet Haumea. Discovered by Michael E. Brown and the Keck Observatory adaptive optics team in the fall of 2005, it is named after Nāmaka, a water spirit and one of the daughters of Haumea in Hawaiian mythology. Namaka follows a highly elliptical orbit that is highly tilted by roughly 13 degrees with respect to Haumea's equator. Namaka is heavily perturbed by both the gravitational influence of Haumea's larger, outer moon Hiʻiaka and the variable gravitational field of Haumea's elongated shape.
With a diameter of around 150 km (93 mi), Namaka is predicted to have an irregular shape and a chaotic rotation. It has a reflective surface made of fresh water ice, similar to that of Haumea and Hiʻiaka. Like Hiʻiaka, Namaka is believed to be a fragment of Haumea that was ejected in the aftermath of a giant impact 4.4 billion years ago.