SAP and PDCSAP both show an increasing scaled eclipse interval in V1143 Cyg from 2019 to 2024

V1143 Cyg is an eclipsing binary with known apsidal motion. We tested whether its local eclipse phase changed in 15 public two-minute TESS SPOC light curves from 2019 to 2024. Local edge midpoints and bracketing primary eclipses give 17 scaled short eclipse intervals in ten sectors. The equal-sector PDCSAP slope is 115.0 seconds per year, with an approximate HC3 and Student t 95% interval of 99.8 to 130.1. The SAP slope is 102.5 seconds per year, with an interval of 98.5 to 106.4. The point estimates differ by 12.5 seconds per year. A paired 95% interval for this difference is -2.8 to 27.8 seconds per year. It includes zero. Depth, baseline, common-sample, and calendar-year checks retain a positive trend. The main annual means differ by 509.9 seconds between 2019 and 2024. Fixed-orbit synthetic flux at the actual sample times gives less than 0.1 seconds per year of apparent drift. A moving-orbit test recovers the expected slope within 0.3%. For fixed eccentricity 0.5386 and inclination 86.9 degrees, the flux slopes imply rates near 0.000915 and 0.000815 degrees per cycle. The range of point estimates limits a precise rate claim. These measurements do not establish excess precession or a planet. The release provides source FITS files, exact data hashes, an event audit, measured timings, code, and instructions to repeat the work.

V1143 Cyg · HD 185912 · TIC 424719589 · TESS · eclipsing binary · apsidal motion · eclipse timing · flux processing · reproducible data