Seven TESS sectors show a 37 minute change in CW Cep secondary eclipse spacing from 2019 to 2024

We test whether later public TESS eclipses of CW Cep follow the spacing change expected from its known apsidal motion. We use all seven SPOC 120 second light curve sectors in a saved MAST query: 17, 18, 24, 57, 58, 84, and 85. Local even polynomial fits give 118 accepted reference eclipse times and 45 complete primary-secondary-primary triplets. The secondary phase is measured relative to its two adjacent primary centers. Its change between the equally weighted 2019 and 2024 sector means is equivalent to 37.16 minutes. The reference sampling error estimate is 0.23 minutes, conditional on the measurement method. Twelve choices of flux series, core width, and polynomial order give changes of 36.32 to 37.29 minutes on the same triplets. That range is a sensitivity test, not a confidence interval. A geometric model with the published central eccentricity and apsidal rate, fitted in angle to 2019 only, misses the 2024 phase by about 194 seconds. A change of eccentricity by minus 0.00090, within its published uncertainty, reduces the final-sector residual to 29 seconds. Thus the spacing change is consistent with continued apsidal motion, but it does not establish changed dynamics. We provide the native inputs, source hashes, source code, timing catalog, rejection records, figures, and offline checks. This is a later timing dataset and a test of parameter dependence, not the first detection of apsidal motion or a planet claim.

CW Cephei · TIC 434893323 · TESS · eclipsing binaries · apsidal motion · eclipse timing · public data · reproducible astronomy