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New Ephemerides of Nix and Hydra During the 1985 to 1990 Mutual Events Between Pluto and Charon

Acknowledging the non-Keplerian orbits for the Plutonian moons Nix and Hydra due to significant perturbations by Charon, new ephemeris positions were calculated to assist with their detection in previous observations of the Pluto system. To compensate for unknown albedo and density, we varied their masses from 1.0x10 kg to 2.5x10 kg to allow for extremes of Pluto-like albedo and a waterice density to comet-like albedo and Pluto-like density, respectively. New ephemeris positions of Nix and Hydra should allow us to identify them in stacked images from archival Hubble Space Telescope data. Also, the coplanar orbits of Nix, Hydra, and Charon result in a shared season of mutual events. In Pluto and Charon mutual event observations made between 1985 and 1990, Nix or Hydra mutual events with Pluto may have been unknowingly observed, however these events would be shallow if detectable at all. Even though mutual events between Nix or Hydra and Charon did occur, the focus of the observations during this time was on the events between Charon and Pluto. This situation makes for the possibility that there were observations of one of these Nix or Hydra and Charon events very remote.