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One of the results of the Milky Way Star Clusters (MWSC) survey by Kharchenkoet al. (2013) was the detection of a slight under-density of old (ca. 1 Gyr)clusters within the nearest kilo-parsec from the Sun. This under-density may bedue to an ineffectiveness in the detection of larger structures with lowersurface brightness. We report on our attempts to reveal such clusters. Wederived proper motions from a combination of Tycho-2 with URAT1, and obtained amean precision of about 1.4 mas/y per co-ordinate for 1.3 million stars northof -20 degree declination. We cut the sky into narrow proper motion slices andsearched for spatial over-densities of stars in each slice. In optical andnear-infrared colour-magnitude diagrams stars from over-densities were thanexamined to determine if they are compatible with isochrones of a cluster. Weestimated the field star contamination using our data and the Besancon Galacticmodel.We detected 9 hitherto unknown open clusters in the vicinity of the Sunwith ages between 70 Myr and 1 Gyr, and distances between 200 and 500 pc.

Nine new open clusters within 500 pc from the Sun