The Eris/Dysnomia system I: The orbit of Dysnomia

  title={The Eris/Dysnomia system I: The orbit of Dysnomia},
  author={Bryan J. Holler and William M. Grundy and Marc W. Buie and Keith S. Noll},
Abstract We present new results on the Eris/Dysnomia system including analysis of new images from the WFC3 instrument on the Hubble Space Telescope (HST). Seven HST orbits were awarded to program 15,171 in January and February 2018, with the intervals between observations selected to sample Dysnomia over a full orbital period. Using relative astrometry of Eris and Dysnomia, we computed a best-fit Keplerian orbit for Dysnomia. Based on the Keplerian fit, we find an orbital period of 15.785899±0… Expand

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