Sector 100 TESS data give a TOI-1227 b transit time of BJD_TDB 2461080.0404 with a symmetric model

We measure a complete TOI-1227 b transit in public TESS sector 100 data from February 2026. A symmetric transit with a quadratic flux baseline gives BJD_TDB 2461080.0404. The white-noise error is 5.86 minutes. The largest central 68.27 percent half width from four residual block sizes is 5.61 minutes. Seventeen control fits change the time by -0.64 to +3.24 minutes. Gaussian process checks with two ranges for the covariance parameters change it by -0.01 and -0.05 minutes. Their profile errors are as large as 7.55 minutes. The measured time is 17.66 minutes after a fixed curve made from the 2024 paper's median sine parameters. This comparison has no joint prediction interval and does not reject the earlier timing model. Sector 99 has a gap across the expected transit and gives no reported time. The contribution is one new time at epoch 90, five older-event method checks, and a reproducible data package. The errors depend on the flux and noise models. This result does not determine a companion mass.

TOI-1227 b · TIC 360156606 · TESS · transit timing · young planets · stellar variability