Summary of the regions of the parameter space governing the dynamics of a massless satellite on a nearly circular orbit. The phase space features three equilibrium points (‘Laplace states’), among which P₁ and P₂ are stable to inclination variations and P₃ is unstable. At point S₁ of the parameter space, P₁ and P₃ degenerate into the equilibrium circle that is stableto inclination variations. In region S₂ of the parameter space, P₂ and P₃ degenerate into the equilibrium circle that is stableto inclination variations. In regions E₁, E₂, and E₃, respectively, P₁, P₂, and P₃ are unstable to eccentricity variations. In region S₂ ∪E₂, is unstable to eccentricity variations. At point S₁, is stable to eccentricity variations provided that the equatorial inclination of the satellite verifies cos² I_Q ≤ 1∕5.