The 2009–2013 Kepler eclipse position favors the faint neighbor of TOI 7027.01 with linear Gaia motion

We test the source assigned to TOI 7027.01 with public catalog positions and light curves. KOI 21.01 is already a known binary, and ExoFOP already records the alias. With linear Gaia proper motion, the archived Kepler eclipse position is 0.094 arcseconds from Gaia DR3 source 2131405493766149376 at 2011.0. It is 2.19 arcseconds from the bright TOI star. The source preference remains similar at 2009.0 and 2013.0. Fits to 18 Kepler files and ten TESS QLP files retain 292 and 60 primary windows. They link the later dips to the fixed 4.288515468-day Kepler prediction. TESS sector 53 has a time shift of −21.72 ± 5.41 minutes. Alternative settings change TESS times by at most 2.27 minutes. The time errors omit template, local baseline, and prediction uncertainty. The Kepler data also recover the known secondary eclipse. A revised ground time agrees with the prediction, but the ground source assignment gives contrary evidence. The position test favors the faint neighbor among the two resolved Gaia sources. Unknown position errors and unresolved objects limit the result. The package preserves code, frozen mission data, exact input URLs and hashes, result tables, figures, and replay instructions. The original Gaia rows remain external under ESA terms.

TOI 7027.01 · KOI 21.01 · TIC 164783371 · KIC 10125352 · Kepler · TESS · Gaia DR3 · source position · eclipsing binaries · candidate host assignment