Abstract
We have used the Hubble Space Telescope observations to measure propermotion of the globular cluster NGC 6656 (M22) with respect to thebackground bulge stars and its internal velocity dispersion profile.Based on the proper motion of the cluster, its space velocity(Π,Θ,W) = (184±3, 209±14, 132±15) km s−1 andgalactic orbit are also obtained. The central velocity dispersion inradial and tangential components of the internal motion of cluster stars is16.99 km s−1. We derive the mass-to-light ratioM/LV~3.3±0.2, which is relatively higher than the previousresults.
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