Dynamical age of the Tucana-Horologium young stellar association

ABSTRACT The Tucana-Horologium association is one of the closest young stellar groups to Sun and despite close proximity its age still debated in literature. We take advantage state-of-the-art astrometry delivered by third data release Gaia space mission combined with precise radial velocity measurements obtained from high-resolution spectroscopy investigate dynamical association. perform an extensive traceback analysis using a combination different samples cluster members, metrics evaluate minimum size past models for galactic potential integrate orbits back time. $38.5^{+1.6}_{-8.0}$ Myr that we derive this paper consistent various estimates isochrone fitting literature (30–50 Myr) reconciles, first time, lithium depletion (∼40 Myr). Our results are independent represent more step towards constructing self-consistent scale Solar neighbourhood based on 3D motion stars.