Orbit determination of the moons of the Pluto–Charon system

Four small moons (Styx, Nix, Kerberos and Hydra) are at present known to orbit around the barycenter of Pluto Charon, which themselves considered a binary dwarf-planet due their relatively high mass ratio. The central, non-axisymmetric potential induces moon orbits inconvenient be described by Keplerian osculating elements. Here, we report that observed orbital variations, may not result eccentricities or observational uncertainties, but forced oscillations caused central binary. We show, using numerical integration analytical considerations, differences reported on elements, well arise from this intrinsic behavior rather than limitations our instruments.