TESS difference images with motion terms support TOI-1892 over its nearest Gaia neighbor for three 29.35 d dips

We tested the source positions of four TESS dips at TOI-1892 with public two-minute pixel data. Three dips have the 29.351 d period reported in an earlier SCI study. We fit the image of the lost light with a pixel response function at the target and its nearest Gaia DR3 neighbor, about 18.5 arcsec away. With time and motion terms included, free fits lie 1.5 to 2.6 arcsec from the target. All tested model changes that retain motion terms favor the target for these three dips. The neighbor-minus-target error scores are 109.52, 100.78, and 79.18. These scores use diagonal weights and are not calibrated probabilities. Omitting motion terms reverses the source preference for the Sector 69 dip. Conditional block-resampling tests also separate the two injected sources for the three later dips. The early Sector 2 dip changes source preference with model choices. In 87 overlapping control windows, injections at the two stars give overlapping scores. Its source remains unresolved. The contribution is a reproducible source constraint for the later series and a test of its motion dependence. We preserve lossless data extracts, source hashes, code, fitted images, all noise draws, and five figures. The result compares the target with one resolved neighbor. It does not exclude an unresolved blend or confirm a planet.

TOI-1892 · TIC 63698669 · TESS · difference imaging · pixel response function · transit source · Gaia DR3 · motion correction · reproducible astronomy