Result of fitting the 1981 model light curve (shown in Fig. 8) to the data from BRITE, ASTEP, and bRing. The upper panel shows the value of the fit amplitude a, and the dotted line shows the measured amplitude from the 1981 event. The error bars are one sigma limits determined from the lmfit algorithm. The lower panel shows the smallest value of a if there is more than one telescope with data. The dark grey and light grey panels indicate the 100% and 50% radii of the Hill sphere, respectively.