  The orbital motion is derived for a non-spinning test-mass in the
relativistic, gravitational field of a rotationally deformed body not
restricted to the equatorial plane or spherical orbit. The gravitational field
of the central body is represented by the Kerr metric, expanded to second
post-Newtonian order including the linear and quadratic spin terms. The orbital
period, the intrinsic periastron advance, and the precession of the orbital
plane are derived with the aid of novel canonical variables and action-based
methods.
