Upper limit on Capotauro’s proper motion (black dashed line) compared to that of other known Y BDs as function of their distance (colored circles). The colored lines show the relation μ = v_tan/(4.74 d) for different galactic components: thin disk (v_tan ≤ 50 km s⁻¹, solid), thick disk (50 < v_tan ≤ 200 km s⁻¹, dashed), and halo (v_tan > 200 km s⁻¹, dotted). The color scale indicates the different values of v_tan. The gray shaded area represents distance values excluded by the best-fit flux normalization.