Relationship between a star’s phase space density and its peculiar velocity. Left: local 20th-nearest neighbour phase space density and probability of membership in the high-density population, for 600 stars within 40 pc of the Sun. We show the fitted quartic trend of the density as a function of peculiar velocity. The outlier at ρ ∼ 150 is Gaia EDR3 3277270538903180160 (LP 533-57, HIP 17766), a Hyades member. Centre: residuals to the fit, after the trend is removed. Right: densities and peculiar velocities of 600 neighbours of Pr0201 (BD+20 2184), a hot Jupiter host in the Præsepe cluster. Pr0201 and other Præsepe members stand out from the trend. Green background shading shows the approximate bounds for membership in the Galactic thin disc, thick disc, and halo from Bensby et al. (2014).