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The orbital motion is derived for a non-spinning test-mass in therelativistic, gravitational field of a rotationally deformed body notrestricted to the equatorial plane or spherical orbit. The gravitational fieldof the central body is represented by the Kerr metric, expanded to secondpost-Newtonian order including the linear and quadratic spin terms. The orbitalperiod, the intrinsic periastron advance, and the precession of the orbitalplane are derived with the aid of novel canonical variables and action-basedmethods.

Observables of a test-mass along an inclined orbit in a post-Newtonian approximated Kerr spacetime to leading-order-quadratic-in-spin