TESS fits with fixed transit shapes place 3 TOI-178 d transits in 2026 later than a 2018–2023 constant-period clock predicts

We measured transit times in five public TESS sectors for TOI-178. We fixed the published transit shapes and fitted local baselines, depths, and times. We fitted constant-period clocks to accepted events from 2018, 2020, and 2023. For planet d, 3 accepted 2026 events occur 55.6 to 67.6 minutes after that clock predicts. Their mean offset is +62.5 ± 11.9 minutes. This error includes shared clock uncertainty and earlier timing scatter. Residual blocks and alternative flux, baseline, and duration fits test the timing errors. A check added after the first fit found a possible exchange of d and e labels in one window. We excluded both uncertain labels. We preserve the original data, source records, code, fits, and figures. These measurements extend the known timing variations to 2026 under the stated shape and noise assumptions. They do not identify a new planet or test the published interacting-orbit predictions.

TOI-178 · TESS · transit timing · constant-period forecast · public astronomical data · planet assignment