Six TESS sectors sample every GJ 251 c transit train with events of at least 1.94 hours in the tested White NEID box

We test whether gaps in six public TESS sectors can hide every transit of GJ 251 c within fixed orbit bounds. We use 92,201 retained measurement times from Sectors 20, 45, 47, 60, 71, and 72. The main box has period 53.647 plus or minus 0.132 days and epoch 2458922.0 plus or minus 4.2 days, in BJD TDB. These bounds use three times the listed errors in the White NEID orbit of Beard et al. (2025). They are not a joint confidence region. We assume one fixed period, epoch, and transit length per train. Every train with transit length at least 1.94 hours contains a retained measurement midpoint. A separate count partition checks this claim over the full closed box. Trains of three-hour transits contain at least 30 midpoints. Boxes with one and two times the listed errors guarantee at least 85 and 75 midpoints. A limiting missed interval has length 1.93873505 hours. In a wider box with five times the errors, 2.66846 percent of the geometric area permits missed trains of three-hour transits. This area is not a posterior probability. We test observation times, not transit depths. We set no planet radius limit and claim no new planet or transit. The package contains six original light curves, archive records, source code, count certificates, figures, and independent checks.

GJ 251 c · TESS · transit coverage · ephemeris · observation window · radial velocity planets · reproducible astronomy