Variations of semi-major axis, eccentricity and inclination for a clone of 311P. Purple lines denote purely gravitational integrations, while pale-blue and green lines denote integrations which include NG interactions with P = 0.4 and 0.1 respectively. With A₂ > 0, the particle evolves outwards Solar System until it is locked in the 9/1 MMR with Saturn and 4/7 MMR with Mars. NG forces affect both semi-major axis and eccentricity.