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The morphology and cluster membership of the Galactic open clusters - Czernik20 and NGC 1857 were analyzed using two different clustering algorithms. Wepresent the maiden use of density-based spatial clustering of applications withnoise (DBSCAN) to determine open cluster morphology from spatial distribution.The region of analysis has also been spatially classified using a statisticalmembership determination algorithm. We utilized near infrared (NIR) data for asuitably large region around the clusters from the United Kingdom Infrared DeepSky Survey Galactic Plane Survey star catalogue database, and also from the TwoMicron All Sky Survey star catalogue database. The densest regions of thecluster morphologies (1 for Czernik 20 and 2 for NGC 1857) thus identified wereanalyzed with a K-band extinction map and color-magnitude diagrams (CMDs). Toaddress significant discrepancy in known distance and reddening parameters, wecarried out field decontamination of these CMDs and subsequent isochronefitting of the cleaned CMDs to obtain reliable distance and reddeningparameters for the clusters (Czernik 20: D = 2900 pc; E(J-K) = 0.33; NGC 1857:D = 2400 pc; E(J-K) = 0.18-0.19). The isochrones were also used to convert theluminosity functions for the densest regions of Czernik 20 and NGC 1857 intomass function, to derive their slopes. Additionally, a previously unknownover-density consistent with that of a star cluster is identified in the regionof analysis.

Morphology of Open Clusters NGC 1857 and Czernik 20 using Clustering Algorithms