Radial velocity changes 175 of 2,079 selected Gaia lens event separations by more than 1 mas under uniform space motion

We tested lens radial velocity in 2,079 saved Gaia microlensing forecasts from 1,593 lenses. Their catalog epochs are from 2026 through 2065. We held the other catalog inputs fixed and compared zero lens radial velocity with the measured Gaia DR3 value. Both runs use the same geometric model of uniform space motion and Earth parallax. Minimum separation changes exceed 1 milliarcsecond (mas) for 175 events from 43 lenses. Date changes exceed one day for 172 events. For Barnard's star's 2039 event, the separation falls from 190.19 to 112.63 mas and the minimum moves 10.68 days earlier. At the unchanged catalog mass, the major image shift rises from 4.23 to 6.88 mas. A paired test with 4,096 Gaia covariance draws gives a 95% separation-change range of -77.80 to -77.32 mas for this case. A finer event grid and Earth spline preserve both sample counts. The package contains frozen public data, input queries and hashes, code, figures, and all event results. These results test radial motion within a stated model. They do not include orbital acceleration or a complete observation model. The sample fraction does not apply to all Gaia events.

astrometric microlensing · perspective acceleration · Gaia DR3 · Barnard's star · radial velocity · forecast sensitivity · reproducible astronomy