China
In this paper we investigate the planar circular restricted (3 + 1)-body problem. A massless particle moves under the Newtonian gravitational influence of three primaries.
These primaries revolve in circular orbits around their common center of mass within the same plane, forming a collinear configuration. We establish the existence and nonlinear stability of equilibrium points under the condition that two of the primaries have equal masses, denoted by μ. Through analytical and numerical methods, we identify a critical mass parameterμ1 ≈ 0.0743 where aHamiltonian–Hopf bifurcation occurs at non-collinear equilibrium points. Furthermore, we prove the existence of Hill-type periodic orbits and KAM tori surrounding these periodic orbits in this circular restricted four-body problem.
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