Weywot (moon)

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Weywot
Quaoar-red-ssc2004-05c.jpg
An artist's rendition of Quaoar and its satellite, Weywot
Discovery
Discovered by Michael E. Brown
Discovery date February 22, 2007
Designations
MPC designation (50000) Quaoar I Weywot
Pronunciation /ˈwwɒt/
S/2006 (50000) 1
Orbital characteristics[1]
~14 500 km
Eccentricity 0.14 ± 0.04
12.438 ± 0.005 d
Inclination 14±4 or 150±4
(two solutions)
Satellite of Quaoar
Physical characteristics
Equatorial radius
40 ± 5 km[2]
~37 km (12:1)[1]
~24.9

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.[3][4] The satellite was found at 0.35 arcsec from Quaoar with an apparent magnitude difference of 5.6.[5] It orbits at a distance of 14,500 km from the primary and has an orbital eccentricity of about 0.14.[1] 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).[1] Brown believes it is likely to be a collisional fragment of Quaoar, which he speculates lost much of its ice mantle in the process.[6] Weywot is estimated to only have 1:2000 the mass of Quaoar.[1]

Name[edit]

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.[7] The name was made official in MPC #67220 published on October 4, 2009.

References[edit]

  1. ^ a b c d e 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. 
  2. ^ Fornasier et al. (2013)
  3. ^ Daniel W. E. Green (2007-02-22). "IAUC 8812: Sats of 2003 AZ84, (50000), (55637), (90482)". International Astronomical Union Circular. Retrieved 2011-07-05. 
  4. ^ Wm. Robert Johnston (2008-11-25). "(50000) Quaoar". Johnston's Archive. Retrieved 2009-05-26. 
  5. ^ Distant EKO The Kuiper Belt Electronic newsletter, March 2007
  6. ^ 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)
  7. ^ "Heavenly Bodies and the People of the Earth", Nick Street, Search Magazine, July/August 2008