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  • $\begingroup$ To put that eccentricity figure in perspective, Earth's orbit around the Sun has an eccentricity of approximately 0.0167, and Mars' corresponding value is 0.0934. $\endgroup$
    – user
    Commented May 22, 2017 at 17:37
  • $\begingroup$ The orbits Pluto and Charon have about their barycenter have eccentricities very close to zero, also a product of tidal evolution as is their mutual tide locking. Thanks for the link. It is good to hear Henry Spencer's voice. $\endgroup$
    – HopDavid
    Commented May 23, 2017 at 6:22