The tested 2023 and 2026 TESS apertures for TIC 400799224 show no hourly flux drop of 10% or more

TIC 400799224 has unexplained dust eclipses. We searched public TESS sectors 64, 65, and 99 for another deep event. The test used aperture flux with quality flags equal to zero, one-hour means, and a 10% drop threshold. The retained exposure is 67.13 days in 2023 and 2026. No valid hourly mean crosses the threshold. The largest drops are 1.53%, 1.20%, and 1.62%. A new extraction from sector 99 images gives the same threshold result for four aperture radii. We placed the measured 2019 eclipse shape into the later flux. Recovery at the full depth is 100.0%, 91.3%, and 76.4% of tested center times. Gaps cause most losses. As a control, default QLP detrending reduces the known 2019 maximum sample depth from 22.58% to 8.76%. The later search therefore uses flux before this detrending step. The package preserves seven input FITS files, source code, hashes, four figures, numeric results, and reproduction steps. The result applies to the tested aperture flux and times. Blended stars, variable event depth, gaps, and uncertain eclipse times prevent a claim that dust activity stopped.

TIC 400799224 · TESS · dust eclipses · aperture photometry · QLP · TESSCut · injection recovery · time series · negative result · public data