The longitude of the periapsis is the sum of the mean longitude and the mean anomaly and the mean longitude is the sum of the

*longitude**of**the**ascending**node*and the argument of periapsis. Trojan objects orbit 60° ahead of or behind a more massive object, both in orbit around an even more massive central object. The best known example are the asteroids that orbit ahead of or behind Jupiter around the Sun. Trojan objects do not orbit exactly at one of either Lagrangian points, but do remain relatively close to it, appearing to slowly orbit it. In technical terms, they librate around = (±60°, ±60°).