Click image for Keck page re: "Tenth Planet" ..
Credit: W. M. Keck Observatory
An image of the most distant planet (2003 UB313) ever seen in the Solar System. A companion (right) was discovered at Keck Observatory on September 10, 2005 (UT).
This near-infrared image is a composite of 24 exposures taken at 2.1 micron wavelength with the Laser Guide Star Adaptive Optics System on the Keck II telescope on Mauna Kea. The ability of the system to detect extremely faint objects at high spatial resolution is advancing the understanding of binary Kuiper belt objects.
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Xena is the little blip on the right, a moon of UB313