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Flat-spectrum radio quasar PKS~1229$-$02 with a knotty and asymmetric radiomorphology was identified as the optical and radio counterpart of a$\gamma$-ray source. In this paper, we study the properties, e.g. morphology,opacity, polarization and kinematics of the jet in PKS~1229$-$02 using radiointerferometry. With our results, we find that the knotty and asymmetricmorphology of this source may probably shaped by the interaction between itsanterograde jet and the nonuniform dense ambient medium. By reproducing aSpectral Energy Distribution of PKS~1229$-$02 with the obtained kinematicparameters, we find that the relativistic beaming effect in PKS~1229$-$02 isnot strong enough to produce the reported $\gamma$-ray emission, i.e.PKS~1229$-$02 may not be a $\gamma$-ray AGN. The misidentification may probablydue to the poor spatial resolution of the $\gamma$-ray detector of the previousgeneration.

The Jet of FSRQ PKS~1229$-$02 and its Misidentification as a $\gamma$-ray AGN