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  • $\begingroup$ The answers to this related question may be helpful: physics.stackexchange.com/q/150797/123208 Also see en.wikipedia.org/wiki/Specific_orbital_energy $\endgroup$ Commented Feb 25 at 17:29
  • $\begingroup$ To get a better intuition about the question you are asking, I would suggest calculating, for a given pair of masses, the speed required to maintain a stable circular orbit at different distances. $\endgroup$ Commented yesterday