Four TESS dimming times for TIC 25194908 do not fit a constant period under local flux fits and independent errors

We test whether four public TESS dimming times for TIC 25194908 fit a constant period. The period near 337.46 days was already reported in ExoFOP. We fit each event with an exposure-integrated trapezoid and a local flux baseline. We estimate timing errors with residual blocks from 30 to 480 minutes. At assumed cycles 0, 2, 5, and 7, a common epoch and period give chi-square 104.74 for two degrees of freedom. The sector-28 time is 94.6 minutes later than the line through sectors 3 and 90, with an estimated standard error of 9.5 minutes. The tested flux and shape choices give a difference from 85.0 to 104.6 minutes. This is a sensitivity range, not a confidence interval. An assumed extra independent event error of 30.7 minutes reduces chi-square to the 95% reference. The result depends on source association, local flux models, and independent timing errors. The target selection was exploratory. No planet or physical cause is confirmed. The package contains seven unchanged source light curves, source records, all timing results, figures, code, and reproduction instructions.

TESS · TIC 25194908 · transit timing · long-period planet candidates · public astronomical data · timing uncertainty · reproducible research