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AT2019wey is a transient discovered by the Asteroid Terrestrial-impact LastAlert System (ATLAS) survey in December of 2019. Follow-up optical, radio, andX-ray observations led to classification of this source as a Galactic blackhole X-ray binary. We carried out one-epoch 6.7 GHz European VLBI (Very LongBaseline Interferometry) Network (EVN) and two-epoch multiple-frequency (1.6,4.5, 6.7 GHz) Very Long Baseline Array (VLBA) observations within a year afterits discovery. These observations reveal a fading and flat-spectrum radiosource with no discernible motion. These features suggest the detection of acompact jet. The source appears resolved at milliarcsecond scales, and thesource angular size versus frequency trend is consistent with scatterbroadening. This allows us to constrain the lower limit of the source distanceto 6 kpc, if the scattering medium is in a Galactic spiral arm. For a sourcelocation larger than 3 kpc, the estimated upper limit of the peculiar velocity,relative to the local standard of rest, suggests the asymmetric natal kick mayhave occurred during the black hole formation stage.

A long-lived compact jet in the black hole X-ray binary candidate AT2019wey