<P> In June 2015, the New Horizons spacecraft captured consecutive images of the Pluto--Charon system as it approached it . The images were put together in an animation . It was the best image of Charon to that date (4). In July 2015, the New Horizons spacecraft made its closest approach to the Pluto system . It is the only spacecraft to date to have visited and studied Charon . </P> <P> The center of mass (barycenter) of the Pluto--Charon system lies outside either body . Because neither object truly orbits the other, and Charon has 12.2% the mass of Pluto, it has been argued that Charon should be considered to be part of a binary system with Pluto . The International Astronomical Union (IAU) states that Charon is considered to be just a satellite of Pluto, but the idea that Charon might be classified a dwarf planet in its own right may be considered at a later date . </P> <P> In a draft proposal for the 2006 redefinition of the term, the IAU proposed that a planet be defined as a body that orbits the Sun that is large enough for gravitational forces to render the object (nearly) spherical . Under this proposal, Charon would have been classified as a planet, because the draft explicitly defined a planetary satellite as one in which the barycenter lies within the major body . In the final definition, Pluto was reclassified as a dwarf planet, but the formal definition of a planetary satellite was not decided upon . Charon is not in the list of dwarf planets currently recognized by the IAU . Had the draft proposal been accepted, even the Moon would be classified as a planet in billions of years when the tidal acceleration that is gradually moving the Moon away from Earth takes it far enough away that the center of mass of the system no longer lies within Earth . </P> <P> The other moons of Pluto, Nix, Hydra, Kerberos and Styx, orbit the same barycenter, but they are not large enough to be spherical, and they are simply considered to be satellites of Pluto (or of Pluto--Charon). </P>

How does the presence of charon support that pluto is a planet
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