Median of the five epochs of Proxima acquired near quadrature in 2018 (MJD 58222, 58227, 58244, 58257, 58288), combined assuming an inclination of i = 120 degree. Individual images were rotated to take into account orbital motion with respect to the reference epoch (MJD = 58 222). The north and east positions are then correct for that epoch alone. The search area for c is the ring between thetwo green dashed circles, with inner radius of 1080 mas and outer radius of 1200 mas. The yellow circles denote the best candidate at the epoch of observation (that is MJD = 58 222, 2018-04-13) and at mid-April 2020, providing an idea of the speed and direction of the orbit. The cyan dashed line represents the orbit of the candidate planet on the sky plane. Two faint background stars are still visible in this image. The color bar is the median S/N over the five epochs.