Proper motion analysis of HIP 79098 (AB)b. The blue, green, and red circles with error bars are the measured positions of the companion relative to the parent star for epochs 2000, 2004, and 2015, respectively. Each observation is consistent with CPM. Also plotted is a static background track in black starting from the 2000 epoch, with red and green asterisks denoting the expected locations for a static background object in 2004 and 2015. The magenta asterisk and dashed line are the mean and 1σ error ellipse of the simulated sample of galactic stars (see text).