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The physical nature of a series of 20 new open clusters is confirmedemploying existing data on putative star members, mainly from second Gaia DataRelease (DR2). The clusters were discovered as overdensities of stars by visualinspection of either photographic DSS plates or proper motion plots of randomsource fields. The reported objects are not present in the most comprehensiveor recent catalogs of stellar clusters and associations. For all of them,clumps of comoving stars are revealed in the proper motion space. Theparallaxes of the clumped stars are compatible with the real existence of openclusters over narrow ranges of distances. Surface density calculations, free ofmost noise from non-member sources, allow in some cases differentiating acluster core and an extended cluster corona. Color-magnitude diagrams generallyshow a definite main sequence that allows the confirmation of the physicalexistence of the clusters and some of their characteristics. Two of the newclusters seem to form a double system with a common origin. Several of the newclusters challenge the claim of near completeness of the known OC population inthe distance range from 1.0 to 1.8 kpc of the Sun (Kharchenko et al. 2013).

New Open Clusters Found by Manual Mining of Data in Gaia DR2