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An update from Wikipedia about our friend Quaoar:

The discovery of a satellite of Quaoar was reported in IAUC 8812 on 22 February 2007.[15][16] The orbit of this satellite has yet to be determined. The satellite was found at 0.35 arcsec from Quaoar with magnitude difference of 5.6.[17] Assuming an albedo similar to that of the primary the magnitude suggests a diameter of 95 ± 24 km.[16] Brown believes it is likely to be a collisional fragment of Quaoar, which he speculates lost much of its ice mantle in the process.

Brown has left the choice of a name up to the Tongva, who have reportedly chosen the sky god Weywot, son of Quaoar. However, the Tongva have yet to formally inform Brown or the IAU of their decision.[18]

Full page is here: http://en.wikipedia.org/wiki/50000_Quaoar