
Jets in active galactic nuclei (AGN) can undergo changes in direction over time, often linked to physical processes near their central supermassive black holes. In this study, we analyze the parsec-scale jet of the quasar NRAO 530 using 160 epochs of VLBI (Very Long Baseline Interferometry) observations at 43 GHz, covering the period from 2007 to 2024. We measured the inner jet apparent position angle (PA) in each epoch and found a quasi-sinusoidal variation with a period of approximately 6.6 years. This period coincides with previously reported timescales of flux variability, suggesting a common origin possibly driven by varying Doppler boosting due to the jet precession. Among the mechanisms that could explain this behavior, we find that Lense-Thirring precession of the tilted accretion disk is the most plausible. By combining the observed precession period with luminosity-based constraints, we narrow down the range of the parameters of the black hole and accretion disk system, including the black hole spin and the precessing disk size.
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