The measured secondary eclipse phase and width ratio of TIC 470715046 decrease in TESS data from 2019 to 2024

Public TESS light curves show a change in both local eclipse phase and relative width for TIC 470715046. We measure 17 complete primary–secondary–primary groups in eight sectors from 2019 to 2024. Between four early groups in sectors 17 and 24 and six late groups in sectors 84 and 85, the mean secondary phase decreases from 0.237204 to 0.223152. The change equals 102.1 minutes when multiplied by the catalogue period of 5.047006 days. The secondary-to-primary half-depth width ratio decreases from 1.5532 to 1.4351, or 7.6%. Seven analysis choices on the same groups give a phase change equivalent to 101.9–103.6 minutes earlier. Separate edge fits confirm both directions in the denser 2022–2024 data. Fixed-phase synthetic eclipses at the actual sample times give less than one minute of false endpoint change. Prior work already identified apsidal motion in this system. This contribution adds quantitative event measurements and reproducible controls; it does not establish a new planet, a companion, or a physical apsidal period. The package preserves raw light curves, source hashes, all three measured targets from the exploratory search, code, results, figures, and repeat-run checks.

TESS · eclipsing binaries · TIC 470715046 · apsidal motion · eclipse timing · eclipse width · QLP · public astronomical data · reproducible measurements