628 new open clusters found with OCfinder

Then, these overdensities are classified into random statistical overdensities or real physical open clusters using a deep artificial neural network trained on well-characterised G, G_BP_-G_RP_ colour-magnitude diagrams. We report the discovery of 628 new open clusters within the Galactic disc, most of them located beyond 1 kpc from the Sun. From the estimation of ages, distances and line-of-sight extinctions of these open clusters, we see that young clusters align following the Galactic spiral arms while older ones are dispersed in the Galactic disc.

Furthermore, we find that most open clusters are located at low Galactic altitudes with the exception of a few groups older than 1Gyr. We show the success of the OCfinder method leading to the discovery of a total of 1310 open clusters (joining the discoveries here with the previous ones based on Gaia DR2), which represents almost 50% of the know population. Our ability to perform big data searches on a large volume of the Galactic disc, together with the higher precision in Gaia EDR3, enable us to keep completing the census with the discovery of new open clusters.