The Spin-Orbit Rotation of Mercury
One of the main characteristics of Mercury is its 3 : 2 spin-orbit resonance. The analytical 2-degrees of freedom model proposed here takes into account this phenomenum thanks to the introduction of two suitable resonant variables. Our model must be considered as a base for future computations; it does not include perturbations due to the in.uence of the other planets, the non-alignment of spin axis with the normal to the equatorial plane and the non-rigidity of the body. These perturbations will be added later on. However the results obtained by our simplified model for the angular variables frequencies are coherent with those given by existing complete numerical models.
KeywordsCanonical Transformation Space Mission Celestial Mechanics Spin Axis Dynamical Astronomy
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