The fitted time of the second 2020 HD 110067 c transit depends on the TESS flux and duration models

We test the four public TESS transits of HD 110067 c in sectors 23 and 49. A 2026 catalog reports a 28-sigma timing signal. Its second 2020 event is 16.81 minutes before the discovery prediction, with a 0.32-minute error. We use two corrected light curves: the discovery reduction and the SPOC reduction. With a fixed shape, 12 planned baseline fits give offsets from +0.24 to +0.91 minutes. With a free duration and linear baseline, the discovery reduction gives -22.83 minutes. Its duration scale is 1.22. The SPOC corrected result is +0.16 minute with scale 0.95. A match of exposure times does not remove the difference. Fixed-shape residual-block tests also give larger errors than the catalog supplies. Thus this event time depends on flux, baseline, duration, and noise models. The local fits do not give stable support for the reported catalog significance. They do not exclude real timing variation. The release holds exact source data, provenance, code, and results. It includes fit tables, bootstrap draws, numerical checks, figures, and reproduction instructions.

HD 110067 c · TESS · transit timing · correlated noise · reproducibility · flux reduction · transit duration