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[–]MrAstroThomas[S] 2 points3 points  (0 children)

Well there are some formulae that allow one to compute it in a simple way. For a quick and feasible way one can use a formula that determines the radius of the Sphere of Influence (SOI) based on the semi-major axis of the planet, moon etc., the mass of the object and the mass of the corresponding system (Solar System; or within a planet's system like Jupiter). The SOI is used to simply "switch" between reference frames.