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Open clusters are convenient probes of the structure and history of theGalactic disk. They are also fundamental to stellar evolution studies. Thesecond Gaia data release contains precise astrometry at the sub-milliarcsecondlevel and homogeneous photometry at the mmag level, that can be used tocharacterise a large number of clusters over the entire sky. In this study weaim to a establish list of members and derive mean parameters, in particulardistances, for as many clusters as possible, making use of Gaia data alone. Wecompile a list of thousands of known or putative clusters from the literature.We then apply an unsupervised membership assignment code, UPMASK, to the GaiaDR2 data contained within the fields of those clusters. We obtained a list ofmembers and cluster parameters for 1229 clusters. As expected, the youngestclusters are seen to be tightly distributed near the Galactic plane and totrace the spiral arms of the Milky Way, while older objects are more uniformlydistributed, deviate further from the plane, and tend to be located at largerGalactocentric distances. Thanks to the quality of GaiaDR2 astrometry, thefully homogeneous parameters derived in this study are the most precise todate. Furthermore, we report on the serendipitous discovery of 60 new openclusters in the fields analysed during this study.

A Gaia DR2 view of the Open Cluster population in the Milky Way