
 [No title] 
  Classical orbital elements: semimajor axis, eccentricity, inclination, node angle, argument of periapsis, and mean anomaly, are an example of such a set, as are the six elements of a cartesian state vector: x, y, z, vx, vy, and vz. 
  A "frozen" orbit is one where J3 acts to cancel the precession of periapsis due to J2. 
  Note also that the regression of the node due to J2 is modeled without regard to whether the orbit is "frozen". 
 roger.ecn.purdue.edu /~masl/documents/xiorb/xiorb.current/xiorb.html (1273 words) 
