either Nix or Hydra into its current orbit, but not both: boosting Hydra would have required a near-zero Charonian eccentricity of 0.024, whereas boosting Nix would have required a larger eccentricity of at least 0.05. This suggests that Nix and Hydra were instead captured material, formed around Pluto-Charon, and migrated inward until they were trapped in resonance with Charon. The existence of Kerberos and Styx may support this idea.

Rotation

Prior to the New Horizons mission, Nix, Hydra,

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