The restricted 3-body problem with radiation pressure

The restricted 3-body problem is generalised to include the effects of an inverse square distance radiation pressure force on the infinitesimal mass due to the large masses, which are both arbitrarily luminous. A complete solution of the problems of existence and linear stability of the equilibrium points is given for all values of radiation pressures of both liminous bodies, and all values of mass ratios. It is shown that the inner Lagrange point, L₁, can be stable, but only when both large masses are luminous. Four equilibrium points, L₆, L₇, L₈, and L₉ can exist out of the orbital plane when the radiation pressure of the smaller mass is very high. Although L₈ and L₉ are always linearly unstable, L₆ and L₇ are stable for a small range of radiation pressures provided that both large masses are luminous.