A symmetric fit gives BJD_TDB 2461041.10436 for the TOI-2447 b transit in TESS Sector 98

We measure a later transit of the known planet TOI-2447 b, also called NGTS-29 b. We audit all six public two minute TESS light curves for TIC 1167538. Sector 98 covers a complete transit at orbit 43, where orbit zero is the first NGTS event in Gill et al. (2024). A symmetric transit fit gives BJD_TDB 2461041.10436 with an estimated error budget of 0.00068 day, or 0.98 minute. Eight checks of the flux product, local trend, limb darkening, and transit shape change this time by at most 0.31 minute. The event is 25.53 minutes later than a weighted linear fit to the five published times. That old fit already fails a constant period test, so this offset is a reference value, not new evidence from a valid forecast. The new event extends the published record by 16 orbits and 1109 days. The mean interval from the old TESS event at orbit 16 to orbit 43 is 69.337609 days. Sector 106 has no accepted data at the expected orbit 46 transit. The package includes the six original light curves, source hashes, code, fit results, noise checks, figures, and offline instructions. These data do not identify an additional planet or a unique cause of the time changes.

TOI-2447 b · NGTS-29 b · TIC 1167538 · TESS Sector 98 · transit timing · public astronomical data