We came up with a novel method to select comoving pairs based on Bayesian model selection. With this and Gaia DR1, we found some new nearby moving groups.

With the sub-km/s precision of Gaia astrometry, we can resolve and model the internal kinematics of star clusters. I develop a new method based on principled Bayesian inference to model clusters more generally while simultaneously accounting for imperfect group membership via Gaussian Mixure model. Applying it to Hyades, we find velocity shear and anisotropic velocity dispersion.