Notes. Parameters are obtained by fitting the Emelyanov & Samorodov (2015) model to the integrated orbit of Triton over the 400-year time span from 1800 January 1 to 2200 January 1. The orbit is planetocentric. Its elements are defined as referred to the orbital coordinate system, which is defined by Emelyanov & Samorodov (2015). Listed parameters are semimajor axis, a, epoch inclination, I₀, epoch argument of latitude, u₀, epoch longitude of the ascending node, Ω₀, mean rate of secular argument change, , and mean rate of secular change of nodal precession, , and pole right ascension and declination of orbital coordinate system referred to the ICRS, α₀ and δ₀, respectively. The longitude of the ascending node, Ω, is measured from the intersection of the orbital coordinate system reference plane with the ICRS reference plane; the motion of Triton along its orbit is described by the argument of latitude, u = M + ω, where M is the mean anomaly and ω the argument of periapsis.