Periodogram for asteroid (7025) 1993 QA. Top panel: normalized χ² vs. P_sid across the tested range of periods with a step size of 0.8∆P. Bottom left: resampled region around the global minimum with steps of 0.1∆P. Bottom right: closer view of the global minimum, revealing aliases caused by long gaps between apparitions. Periods corresponding to local χ² minima (red dots) below the 3σ threshold (dashed line) were considered for further analysis.