V889 Aql eclipse spacing decreased by 132 seconds from 2021 to 2024 in local TESS fits

We tested the change in eclipse spacing of V889 Aql with public TESS data. We fit 19 complete events in five visits from 2019 to 2024. Seventeen events in four visits determine the main trend. Each visit has a local period and a primary-to-secondary phase interval. The phase interval, multiplied by a fixed 11.120757-day period, decreased by 132.5 ± 8.2 seconds over 3.0595 years. The fitted rate is −43.5 ± 2.4 seconds per year. These errors apply to the selected timestamps and local template model. All tested baseline, window, shape, and flux-extraction choices give a decrease. The QLP flux check uses matched TESS-SPOC exposure times and spans 2022–2024. With fixed eccentricity and inclination, the main rate gives total apsidal motion of 0.000424 ± 0.000023 degrees per orbit. This agrees with the 2022 measured rate. It does not separate the relativistic term from other effects. The package includes 13 fitted eclipse times after the TESS epochs used in that paper, all source light curves, exact data hashes, rejected events, figures, and offline reproduction code. Numerical injection checks test cadence bias but do not establish statistical error coverage.

V889 Aql · TIC 300000680 · TESS · eclipse timing · apsidal motion · public data · time columns