The TESS 2 minute PDC light curves (left), LS periodograms (center), and phase-folded light curves (right) from the variability analysis for HD 17156. Dates in the left panel are shown in Barycentric TESS Julian Date. The variability analysis is performed separately on each TESS sector, which is ordered in time from top to bottom: Sectors 18, 19, 25, and 52. The mean out-of-transit photometric scatter over all sectors is 380 ppm. The red curve shows a sinusoidal fit to the most significant periodicity. The gray points in the left panel indicate data that were removed from the variability analysis, which includes data flagged as poor quality, 5σ outliers, and transits of HD 17156b. In the right panel, the gray points indicate all data included in the variability analysis and the black points represent the binned data. The periodic signals detected by the LS periodograms are inconsistent between sectors and are low in normalized power (<0.1), such that we consider HD 17156 to be a quiet, nonvariable star on timescales <13 days.