The mutual orbit, mass, and density of the large transneptunian binary system Varda and Ilmarë

  title={The mutual orbit, mass, and density of the large transneptunian binary system Varda and Ilmar{\"e}},
  author={William M. Grundy and Simon B. Porter and Susan D. Benecchi and Henry G. Roe and Keith S. Noll and Chadwick A. Trujillo and Audrey Thirouin and J. Stansberry and Elizabeth A. Barker and Harold F. Levison},
Abstract From observations by the Hubble Space Telescope, Keck II Telescope, and Gemini North Telescope, we have determined the mutual orbit of the large transneptunian object (174567) Varda and its satellite Ilmare. These two objects orbit one another in a highly inclined, circular or near-circular orbit with a period of 5.75 days and a semimajor axis of 4810 km. This orbit reveals the system mass to be (2.664 ± 0.064) × 1020 kg, slightly greater than the mass of the second most massive main… 

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