Relative astrometry of the candidate in RA and Dec offsets. Left panel: relative astrometry of the candidate to the primary star (mass ratio = 0). Right panel: relative astrometry of the candidate to the barycentre if the fainter star and primary star are an equal mass binary (mass ratio = 1). The yellow and green regions are the candidate companion positions allowed by the escape velocity within 1σ on 2021-12-02 and 2023-03-03, respectively. The blue line is the trajectory of a static background star evolving from 2018-11-15 calculated with the proper motion and parallax reported in Gaia and the two points on the track are the positions on 2021-12-02 and 2023-03-03.