Local baseline choices reverse the fitted asymmetry of the known day-282 KIC 8027456 dip in Kepler DR25

We test two known detector-linked dips and one known comet candidate in Kepler release 25 data for KIC 8027456. Across 24 choices per dip, the day-282 exit-to-entry width ratio ranges from 0.252 to 6.709. All six long-exit fits use the shortest local window. In zero-flag quadratic aperture fits, the ratio changes from 6.709 in a three-day window to 0.325 and 0.281 in five- and seven-day windows. A separate optimizer confirms these solutions. The day-277 dip always has a shorter exit; the known day-1448.9 candidate always has a longer exit. Thus, a single fitted shape at the day-282 control is not stable dust-tail evidence. These are selected same-telescope sensitivity tests, not false-positive rates or physical identifications. We report no new planet, comet, or independent confirmation. Code, data columns, source hashes, fit tables, solver checks, figures, and offline instructions are included.

astronomy · Kepler · KIC 8027456 · exocomet candidates · detector artifacts · baseline sensitivity