Fig. 5
Period of small oscillations about the two kinds of circular Laplace equilibrium. The period of oscillations around the classical equilibrium exceeds 9 Gyrs for semi-major axes between 350 au and 13 400 au (out of the graph). The period of oscillations around the orthogonal equilibrium is linear with a, and it is everywhere dramatically long with respect to the age of the solar system (apart from very small values of a where the overall model is questionable).
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