That there are a number of moonlike objects (nix and hydra) ALSO orbiting the center of gravity of the Pluto/Charon pair lends credence to declaring Charon a planet and the pair the first official binary planet pair. Since the center of gravity is NOT within Pluto or Charon it is hard to describe the moonds as "orbiting" either - but they CAN be decribed as orbiting the PAIR of planets.