Another informative example is the HD 82943 system. The two planets discovered lie close to the 2:1 resonance. The planets are more distant than those in the preceding system, with periods of 220 and 440 days. The masses are smaller (m1 + m2)/M = 0.003, and a model with the planets on Keplerian orbits is in good agreement with the observations, but the corresponding system is dynamically unstable (Fig. 6.3). There are stable configurations close to this solution. Longer-term observations, together with dynamical studies should enable us to improve the model and even to resolve the uncertainty over the inclination of the system.
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