An artist's rendition of Quaoar and its satellite, Weywot
|Discovered by||Michael E. Brown|
|Discovery date||February 22, 2007|
|MPC designation||(50000) Quaoar I Weywot|
|Alternative names||S/2006 (50000) 1|
|Semi-major axis||~14 500 km|
|Eccentricity||0.14 ± 0.04|
|Orbital period||12.438 ± 0.005 d|
|Inclination||14±4 or 150±4
|Equatorial radius||40 ± 5 km
~37 km (12:1)
Weywot, officially (50000) Quaoar I Weywot, is the only known moon of the trans-Neptunian object Quaoar. Its discovery by Michael E. Brown was reported in IAUC 8812 on 22 February 2007, based on imagery taken on 14 February 2006. The satellite was found at 0.35 arcsec from Quaoar with an apparent magnitude difference of 5.6. It orbits at a distance of 14,500 km from the primary and has an orbital eccentricity of about 0.14. Assuming an equal albedo and density to the primary, the apparent magnitude suggests that the moon has a diameter of about 74 km (1:12 of Quaoar). Brown believes it is likely to be a collisional fragment of Quaoar, which he speculates lost much of its ice mantle in the process. Weywot is estimated to only have 1:2000 the mass of Quaoar.
Upon discovery, Weywot was issued a provisional designation, S/2006 (50000) 1. Brown left the choice of a name up to the Tongva (whose creator god Quaoar had been named after), who chose the sky god Weywot, son of Quaoar. The name was made official in MPC #67220 published on October 4, 2009.
- Brown, Michael E.; Fraser, Wesley C. (2010). "Quaoar: A Rock in the Kuiper belt". The Astrophysical Journal 714 (2): 1547. arXiv:1003.5911. Bibcode:2010ApJ...714.1547F. doi:10.1088/0004-637X/714/2/1547.
- Fornasier et al. (2013)
- Daniel W. E. Green (2007-02-22). "IAUC 8812: Sats of 2003 AZ84, (50000), (55637), (90482)". International Astronomical Union Circular. Retrieved 2011-07-05.
- Wm. Robert Johnston (2008-11-25). "(50000) Quaoar". Johnston's Archive. Retrieved 2009-05-26.
- Distant EKO The Kuiper Belt Electronic newsletter, March 2007
- Brown, M.E.; Fraser, Wesley (2009). "Quaoar: A Rock in the Kuiper Belt". DPS meeting #41. American Astronomical Society. Bibcode:2009DPS....41.6503F. (Backup reference)
- "Heavenly Bodies and the People of the Earth", Nick Street, Search Magazine, July/August 2008