Six TESS sectors from 2019 to 2023 do not detect predicted point-mass orbital decay in HD 265435

We test orbital timing in HD 265435 with six public 120-second TESS SPOC sectors from 2019 to 2023. The input contains 90,838 accepted samples over 1,443.08 days. We fit orbital harmonics and local trends in each sector. The second harmonic gives the main clock. A quadratic fit gives a period derivative of (2.48 +/- 3.97) x 10^-12 seconds per second. This error assumes a stable harmonic clock and the stated block-noise model. A 95% Student t reference interval is [-1.01, +1.51] x 10^-11 seconds per second. Unknown stellar and instrument errors can weaken this interval. The fit does not detect curvature. A circular point-mass model with fixed masses of 0.63 and 1.01 solar masses predicts -1.02 x 10^-12 seconds per second. After a new epoch and period are fit, the largest predicted delay at the observed times is 0.243 seconds. Its nominal weighted signal norm is only 0.42 error units. Thus, this input selection cannot test the predicted decay at the measured precision. Flux and model control fits also do not detect curvature. Removal of the earliest sector greatly weakens the constraint. Phase injections recover the input changes within 0.1%. We publish the six timing measurements, the original FITS files and hashes, source records, code, control fits, figures, and offline reproduction instructions. This contribution supplies a timing dataset and a tested sensitivity. It does not establish physical orbital decay or a new planet.

HD 265435 · TIC 68495594 · TESS · orbital timing · hot subdwarf · white dwarf · orbital decay · ellipsoidal variation · reproducible research