Symmetric fits to TESS sectors 43–45 and 71–73 place the shallow eclipse of HD 250735 33 minutes before the midpoint between deep eclipses

HD 250735 is a known spectroscopic binary with a circular Gaia DR3 fit. We test whether its two TESS eclipses have equal time intervals. Symmetric local fits to 39 complete eclipses in sectors 43–45 and 71–73 give a period of 5.89576363 days. The shallow eclipse occurs 33.33 minutes before the midpoint between deep eclipses. The 95% event bootstrap range is 33.20 to 33.47 minutes early. This range measures event scatter and does not include all model errors. All eight complete deep–shallow–deep groups show the early shallow eclipse without a common period fit. The result holds in both observing eras, with other symmetric profiles, with other local baselines, and with QLP detrended flux. A separate extraction from sector 73 SPOC images gives offsets from 33.46 to 33.55 minutes early. The lost light is near HD 250735. A small eccentricity can explain the timing offset. A full model of the two stars is needed to test that explanation and measure eccentricity. The contribution is an eclipse timing result for a known binary. The package contains the exact public inputs, source requests, hashes, code, event tables, checks, and figures for an offline repeat.

HD 250735 · TIC 400170926 · Gaia-TROI-041 · eclipsing binary · eclipse timing · Gaia DR3 · TESS · orbital eccentricity · reproducible research