The mutual orbit, mass, and density of transneptunian binary Gǃkúnǁ'hòmdímà (229762 2007 UK126)

  title={The mutual orbit, mass, and density of transneptunian binary Gǃk{\'u}nǁ'h{\`o}md{\'i}m{\`a} (229762 2007 UK126)},
  author={William M. Grundy and Keith S. Noll and Marc W. Buie and Susan D. Benecchi and Darin Ragozzine and Henry G. Roe},
Abstract We present high spatial resolution images of the binary transneptunian object Gǃkunǁ'homdima (229762 2007 UK126) obtained with the Hubble Space Telescope and with the Keck observatory on Mauna Kea to determine the orbit of Gǃo'e ǃhuGǃo'e ǃhu, the much smaller and redder satellite. Gǃo'e ǃhu orbits in a prograde sense, on a circular or near-circular orbit with a period of 11.3 days and a semimajor axis of 6000 km. Tidal evolution is expected to be slow, so it is likely that the system… 

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