Families of three dimensional periodic orbits are found in the Artificial Satellite Theory.The orbits are periodic in a synodic reference frame.The dynamical model here considered includes the gravity geopotential,with both zonal and tesseral harmonics.Starting from previous results on frozen orbits,a predictor-corrector scheme enables the numerical continuation of families of periodic orbits for variations of some parameters,namely the C_2,2 tesseral coefficient and the Jacobian constant.Several results are Presented.
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