Image fits with a fixed time shape place the Sector 12 dip of TIC 73149665 about one pixel from the target

We fit the source positions of three reported TESS exocomet candidates. We use exact public image cubes and fixed time shapes from a prior SCI study. We add the official TESS pixel response function, a spatial plane, and a fitted shift of the reference field. The Sector 12 loss of TIC 73149665 fits best 1.13 pixels, or about 24 arcseconds, from the target. The fitted offset stays between 1.11 and 1.17 pixels across the tested time baselines, pixel weights, and field registrations. The free fit explains 92.3 percent of the weighted image power after plane removal. A fit at the registered target explains 14.8 percent. Two faint Gaia DR3 sources are 0.074 and 0.193 pixel from the free fit under the primary registration. A comparison event in Sector 1 is near its target. A Sector 7 event also gives an offset but has large model residuals. All three single-source models fail a conditional residual check. Noise-only draw intervals therefore do not give full position errors. We find evidence that the Sector 12 host assignment needs a new check; we do not identify a unique host or establish an exocomet. The package preserves all inputs, source records, code, figures, tests, and offline reproduction instructions.

TESS · exocomet candidates · difference images · pixel response function · source positions · blended light · Gaia DR3 · reproducible astronomy