With independent Gaussian annual errors, both 2014–2024 NEOWISE endpoint intervals for TIC 400799224 include zero

We tested the combined infrared light of TIC 400799224 in 22 NEOWISE visits from 2014 to 2024. The quality rules retained 263 of 511 target measurements. A fixed sample of 46 nearby stars supplies a local reference. The first and last time thirds contain eight visits each, or four annual pairs. The late-minus-early changes are +0.0139 mag in W1 and +0.0231 mag in W2. Their 97.5% intervals are [-0.0103, +0.0382] and [-0.0264, +0.0725] mag. Both include zero. The two intervals have nominal joint 95% coverage if annual errors are independent and approximately Gaussian and the observed local reference is fixed. Local calibration reduces the W2 point estimate from +0.0448 mag. The target has more visit scatter than the median comparison star. A bright neighbor and target halo flags limit a physical interpretation. These catalog measurements do not establish constant dust emission or confirm a planet. The package preserves exact archive responses, provenance, code, figures, results, and offline checks.

TIC 400799224 · NEOWISE · infrared photometry · dust eclipses · local calibration · negative result · reproducible research