An analytical approach to small amplitude solutions of the extended nearly circular Sitnikov problem. (English) Zbl 1157.70005

Summary: The model of extended Sitnikov Problem contains two equally heavy bodies of mass \(m\) moving on two symmetrical orbits w.r.t. the centre of gravity. A third body of equal mass \(m\) moves along a line \(z\) perpendicular to the primaries plane, intersecting it at the centre of gravity. For sufficiently small distance from the primaries plane the third body performs an oscillatory motion around it. The motion of the three bodies is described by a coupled system of second-order differential equations for the radial distance of the primaries \(r\) and the third mass oscillation \(z\). This problem which is dealt with for zero initial eccentricity of the primaries motion, is generally non-integrable and therefore represents an interesting dynamical system for advanced perturbative methods. In the present paper we use an original method of rewriting the coupled system of equations as a function iteration in such a way as to decouple the two equations at any iteration step. The decoupled equations are then solved by classical perturbation methods. A prove of local convergence of the function iteration method is given, and the iterations are carried out to order 1 in \(r\) and to order 2 in \(z\). For small values of the initial oscillation amplitude of the third mass, we obtain results in very good agreement to numerically obtained solutions.


70F07 Three-body problems


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