Five TESS visits leave 5.41% of phases unobserved for a circular central GJ 357 d model at 55.661 days and 1.5 Earth radii

We test transit coverage for GJ 357 d with five public TESS visits. We use 75,104 selected 120-second samples from sectors 8, 35, 62, 89, and 99. The planet model is circular and central. Its radius is 1.5 Earth radii. Its period is 55.661 days. Five visits leave 5.41% of midpoint phases without selected exposure overlap. The first three visits leave 17.12% unobserved. Four visits leave 5.54% unobserved. Gaps remain at all 901 tested periods from 55.4 to 55.85 days. We also add 512 signals for each of three impact parameters at 55.661 days. Five visits recover 477 central signals, 392 at impact parameter 0.8, and none at impact parameter 1.0. Recovery requires a matched phase and a scaled box-search score of at least 8. A separate post hoc check uses the quoted 2019 marginal period and epoch ranges as a coordinate box. Five visits overlap every central-model epoch at all 221 tested periods in this box. At its nominal period, all 256 added central signals are recovered. The quoted 2026 box still has observation gaps. The primary real-data search has maximum score 6.01, below the fixed threshold. We hold stellar parameters fixed and add circular signals to delivered SPOC flux. These tests do not measure a joint orbit probability or signal loss before the delivered product. The package contains original FITS files, input hashes, full trial tables, code, and figures.

GJ 357 d · TESS · transit search · observation windows · signal injection · grazing transit · public data