Namaka
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Namaka (moon)
Namaka is the faint spot near the bottom of the photo, directly below Haumea (center), in this Keck telescope image.
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Discovery
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| Discovered by | Michael E. Brown, Chad Trujillo, David Rabinowitz, et al. |
| Discovery date | 30 June 2005 |
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Designations
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| MPC designation | Haumea II Namaka |
| Pronunciation | /nɑːˈmɑːkə/,[1] or as in Hawaiian Nāmaka [naːˈmɐkə] |
| Alternate name(s) | (136108) 2003 EL61 II, S/2005 (2003 EL61) 2 |
| Semi-major axis | 25657 ± 91 km[2] |
| Eccentricity | 0.249 (in 2009; variable) |
| Orbital period | 18 day[3] |
| Inclination | 13° relative to Hiʻiaka (in 2008; variable) |
| Satellite of | Haumea |
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Physical characteristics
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| Mean radius | ~85 km (if albedo is same as primary's 0.7±0.1) |
| Mass | 1.79 ± 1.48×1018 kg[2] (0.05% the mass of Haumea) |
| Mean density | (assumed to be near 1) |
| Rotation period | (unknown) |
| Axial tilt | (unknown) |
| Albedo | (unknown) |
| Temperature | 32±3 K |
| Apparent magnitude | 4.6 difference from primary's 17.3[4] |
Namaka is the smaller, inner moon of the dwarf planet Haumea. It is named after Nāmaka, one of the daughters of Haumea, the goddess of the sea in Hawaiian mythology.
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Contents
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Discovery
Namaka was discovered on 30 June 2005 and announced on November 29, 2005.[5] It was nicknamed "Blitzen" by the discovery team before receiving an official name.
Physical characteristics
Namaka is only 1.5% as bright as its dwarf planet Haumea[6] and is about 0.05% its mass. If it turns out to have a similar albedo, it would be about 170 km in diameter.[4] Photometric observations indicate that its surface is made of water ice.[6]
References
- ^ In US dictionary transcription, US dict: nâ·mâ′·kə.
- ^ a b c Ragozzine, D.; Brown, M. E. (2009). "Orbits and Masses of the Satellites of the Dwarf Planet Haumea (=2003 EL61)". The Astronomical Journal 137 (6): 4766. arXiv:0903.4213. Bibcode 2009AJ....137.4766R. doi:10.1088/0004-6256/137/6/4766.
- ^ Brown, M. E.. "Orbits and Masses of the 2003 EL61 Satellite System". http://www.abstractsonline.com/viewer/viewAbstract.aspXXCKey={421E1C09-F75A-4ED0-916C-8C0DDB81754D}&MKey={35A8F7D5-A145-4C52-8514-0B0340308E94}&AKey={AAF9AABA-B0FF-4235-8AEC-74F22FC76386}&SKey={545CAD5F-068B-4FFC-A6E2-1F2A0C6ED978}. Retrieved 2008-10-17.[dead link]
- ^ a b Wm. Robert Johnston (2008-09-17). "(136108) Haumea, Hi'iaka, and Namaka". http://www.johnstonsarchive.net/astro/astmoons/am-136108.html. Retrieved 2008-09-18.
- ^ Green, Daniel W. E. (1 December 2005). "IAUC 8636". http://cfa-www.harvard.edu/iauc/08600/08636.html.
- ^ a b Barkume, K. M.; Brown, M. E.; Schaller, E. L. (2006). "Water Ice on the Satellite of Kuiper Belt Object 2003 EL61". The Astrophysical Journal 640: L87–L89. arXiv:astro-ph/0601534. Bibcode 2006ApJ...640L..87B. doi:10.1086/503159. http://www.gps.caltech.edu/~mbrown/papers/ps/rudolph.pdf.
See also
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