Two 2026 TESS transits of TOI-5678 b agree with the discovery clock on a shared TDB scale

We measure transit centers for TOI-5678 b from six public TESS light-curve files. Two accepted events in July and September 2026 occur within two minutes of the discovery prediction. Their adopted error widths are 4.13 and 6.27 minutes. This comparison assumes that the source BJD clock uses TDB. A coverage rule was saved before flux inspection. It accepts three events for a TESS clock. It excludes two events with missing ingress or baseline. We check the times with changed transit shapes, baselines, fit windows, and flux products. We use 2,000 residual resamples at each of three block lengths for each event. A separate numerical transit integral and a direct weighted clock fit check the calculations. A line through the three accepted times gives a period of 47.73009142 days, with a conditional width of 7.32 seconds. The result gives new measured times and conditional future centers. Three accepted times do not establish a constant period or exclude time changes. The package contains the exact FITS inputs, hashes, source facts, code, figures, and offline reproduction instructions.

TOI-5678 b · TESS · transit times · ephemeris · public data · reproducible astronomy