Model fitting of the kinematics for knot c: trajectory Xn-Zn, core separation rn(t), coordinates Xn(t) and Zn(t), the modeled apparent velocity/viewing angle and Lorentz/Doppler factor. The inner trajectory with the core separation less than ~0.8 mas is fitted by the precessing jet-nozzle model and the outer trajectory is fitted by introducing changes of the amplitude function A(Z). In the upper plots, two additional (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 the precession period is determined with an uncertainty of ~0.3 yr.
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