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NGC 6809 is a luminous metal-poor halo globular cluster that is relativelyeasy to study due to its proximity and low concentration. Because of its highGalactic latitude (b = -23deg), interstellar reddening and contamination is notvery high. We aim to determine the relative proper motion and membershipprobability of the stars in the wide area of globular cluster NGC 6809. Totarget cluster members reliably during spectroscopic surveys and both spatialand radial distributions in the cluster outskirts without including fieldstars, a good proper motion and membership probability catalogue of NGC 6809 isrequired.The archival data of two epochs with a time-base line of 7.1 yearshave been collected with Wide Field Imager (WFI) mounted on the 2.2m MPG/ESOtelescope. The CCD images of both epochs have been reduced using theastrometric techniques as described in Anderson et al. (2006). The calibratedUBVI magnitudes have been derived using Stetson's secondary standard stars. Wederived the relative proper motion and membership probabilities for \sim 12600stars in the field of globular cluster NGC 6809. The measurement error inproper motions for the stars of V \sim 17 mag is 2.0 mas/yr, graduallyincreasing up to \sim 3 mas/yr at V = 20 mag. We also provide the membershipprobability for the published different types of sources in NGC 6809. Anelectronic catalogue with proper motion and membership probability for thestars will be available to the astronomical community.

Proper motions and membership probabilities of stars in the region of globular cluster NGC 6809