New open cluster census in Cygnus OB2 region

HDBSCAN clustering algorithm is applied to the five astrometric parameters (RA,DE,pmRA*cosDE,pmDE,Plx) in a circular region centred at (l,b)=(79.8{deg},+0.8{deg}) of radius 1.5{deg} up to G=19.5mag and leads us to detect four unnoticed open clusters named RSL-03, RSL-04, RSL-05 and RSL-06, as well as 20 known clusters.

The mean proper motion of the open clusters is determined and the members are identified. The coordinates of the centre of the clusters and radii are calculated and their distances are estimated. The analysis of the mean proper motion and the distance of Bica 1, Bica 2, FSR 0236, FSR 0238, FSR 0224, HSC 625, OC-123, OC-128, NGC 6910, RSL-04, RSL-05, and RSL-06 suggests that these open clusters would be related to Cyg OB2 association.