What would happen if equal to Charon's mass was added to the dwarf planet Pluto?

What would happen if equal to Charon's mass was added to the dwarf planet Pluto?
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Answer :

Your question is confusing. Add the mass? The system already has a combined mass. And if you’re asking about a body of the mass of Charon and Pluto combined, the center of mass is should be rather easy to predict. Or are you asking about combining a body of Charon’s mass with Pluto while Charon remains in orbit?
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