Abstract
In this problem, one of the primaries of mass \(m^{*}_{1}\) is a rigid spherical shell filled with a homogeneous incompressible fluid of density ρ1. The smaller primary of mass m2 is an oblate body outside the shell. The third and the fourth bodies (of mass m3 and m4 respectively) are small solid spheres of density ρ3 and ρ4 respectively inside the shell, with the assumption that the mass and the radius of the third and the fourth body are infinitesimal. We assume that m2 is describing a circle around \(m^{*}_{1}\). The masses m3 and m4 mutually attract each other, do not influence the motions of \(m^{*}_{1}\) and m2 but are influenced by them. We also assume that masses m3 and m4 are moving in the plane of motion of mass m2. In the paper, equilibrium solutions of m3 and m4 and their linear stability are analyzed. There are two collinear equilibrium solutions for the system. The non collinear equilibrium solutions exist only when ρ3=ρ4. There exist an infinite number of non collinear equilibrium solutions of the system, provided they lie inside the spherical shell. In a system where the primaries are considered as earth-moon and m3,m4 as submarines, the collinear equilibrium solutions thus obtained are unstable for the mass parameters μ,μ3,μ4 and oblateness factor A. In this particular case there are no non-collinear equilibrium solutions of the system.
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Aggarwal, R., Kaur, B. Robe’s restricted problem of 2+2 bodies with one of the primaries an oblate body. Astrophys Space Sci 352, 467–479 (2014). https://doi.org/10.1007/s10509-014-1963-2
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DOI: https://doi.org/10.1007/s10509-014-1963-2