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An earlier analysis of the Milky Way Star Cluster (MWSC) catalogue revealedan apparent lack of old (> 1 Gyr) open clusters in the solar neighbourhood (< 1kpc). To fill this gap we undertook a search for hitherto unknown starclusters, assuming that the missing old clusters reside at high Galacticlatitudes |b|> 20{\deg}. We were looking for stellar density enhancements usinga star count algorithm on the 2MASS point source catalogue. To increase thecontrast between potential clusters and the field, we applied filters incolour-magnitude space according to typical colour-magnitude diagrams of nearbyold open clusters. The subsequent comparison with lists of known objectsallowed us to select thus far unknown cluster candidates. For verification theywere processed with the standard pipeline used within the MWSC survey forcomputing cluster membership probabilities and for determining structural,kinematic, and astrophysical parameters. In total we discovered 782 densityenhancements, 522 of which were classified as real objects. Among them 139 arenew open clusters with ages 8.3 < log (t [yr]) < 9.7, distances d < 3 kpc, anddistances from the Galactic plane 0.3 < Z < 1 kpc. This new sample hasincreased the total number of known high latitude open clusters by about 150%.Nevertheless, we still observe a lack of older nearby clusters up to 1 kpc fromthe Sun. This volume is expected to still contain about 60 unknown clustersthat probably escaped our detection algorithm, which fails to detect sparseoverdensities with large angular size.

Global survey of star clusters in the Milky Way III. 139 new open clusters at high Galactic latitudes