With independent Gaussian timing errors, two 2024 TOI-1899 b transits agree with a clock from four earlier TESS transits

We tested whether a transit clock from four 2019–2022 TESS events predicts two 2024 events for TOI-1899 b. We used public 120-second SPOC light curves and selected events by time coverage before fitting. We kept the shared uncertainty of the earlier clock. The two later events give chi-square 0.698 for 2 degrees of freedom (p=0.705). Their common time shift is -0.88 ± 2.32 minutes. Its nominal 95 percent interval is -5.42 to +3.67 minutes under independent local event errors. A fit to all six events gives a period of 29.09024104 ± 0.00001988 days. Reduction, baseline, and transit shape controls change each time by less than 0.93 minute. Quoted errors are one standard deviation. A prior survey used the same observations and found no timing variation. This study adds an explicit test of later events, local error checks, and a package with original data and code. The test does not include errors shared across observing sectors. It does not exclude other planets.

TOI-1899 b · TESS · transit timing · ephemeris · reproducible research · prediction covariance