Heatmap of binary systems’ properties, i.e. distances, periods, and mass ratios, that will increase their detectability. The detectability of these systems monotonically decreases with distance, reaching a detection fraction of 50% at around 100 pc. There is a strong detectability window around periods of three years, corresponding to the Gaia observation time baseline. Systems with mass ratios of 0, i.e., single sources, or 1 show no sign of binarity in the RUWE since there is no wobbling of their CoM around the photocentre.