Model fitting of the kinematics for knot h: trajectory Zn-Xn, core separation rn(t), coordinates Xn(t) and Zn(t), the modeled apparent velocity/viewing angle and Lorentz/Doppler factor. The inner trajectory is well fitted by the precessing jet nozzle model. The outer trajectory is fitted by introducing changes of its amplitude function A(Z). An apparent acceleration from ~6.5c to ~12.6c is modeled. In the upper plots, two additional model (red and green) curves calculated for ejection times t0 + 0.3 yr and t0−0.3 yr are shown, indicating that most of the observational data points are within the regions confined by the two curves and that the precession period is determined with an uncertainty of ~0.3 yr.
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