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We constructed a Hubble Space Telescope (HST) astro-photometric catalog ofthe central region of the Galactic globular cluster NGC 1261. This catalog,complemented with Gaia DR2 data sampling the external regions, has been used toestimate the structural parameters of the system (i.e., core, half-mass, tidalradii and concentration) from its resolved star density profile. We computedhigh-precision proper motions thanks to multi-epoch HST data and derived thecluster velocity dispersion profile in the plane of the sky for the innermostregion, finding that the system is isotropic. The combination withline-of-sight information collected from spectroscopy in the external regionsprovided us with the cluster velocity dispersion profile along the entireradial extension. We also measured the absolute proper motion of NGC 1261 usinga few background galaxies as a reference. The radial distribution of the BlueStraggler Star population shows that the cluster is in a low/intermediate phaseof dynamical evolution.

A kinematic view of NGC 1261: structural parameters, internal dispersion, absolute proper motion and Blue Straggler Stars