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A detailed analysis of ground-based CCD UBV photometry and space-based GaiaData Release 3 (DR3) data for the open clusters King 6 and NGC 1605 wasperformed. Using the pyUPMASK algorithm on Gaia astrometric data to estimatecluster membership probabilities, we have identified 112 stars in King 6 and160 stars in NGC 1605 as the statistically most likely members of each cluster.We calculated reddening and metallicity separately using UBV two-color diagramsto estimate parameter values via independent methods. The color excess $E(B-V)$and photometric metallicity [Fe/H] for King 6 are $0.515 \pm 0.030$ mag and$0.02 \pm 0.20$ dex, respectively. For NGC 1605, they are $0.840 \pm 0.054$ magand $0.01 \pm 0.20$ dex. With reddening and metallicity kept constant, we haveestimated the distances and cluster ages by fitting PARSEC isochrones tocolor-magnitude diagrams based on the Gaia and UBV data. Photometric distancesare 723 $\pm$ 34 pc for King 6 and 3054 $\pm$ 243 pc for NGC 1605. The clusterages are $200 \pm 20$ Myr and $400 \pm 50$ Myr for King 6 and NGC 1605,respectively. Mass function slopes were found to be 1.29 $\pm$ 0.18 and 1.63$\pm$ 0.36 for King 6 and NGC 1605, respectively. These values are in goodagreement with the value of Salpeter (1955). The relaxation times wereestimated as 5.8 Myr for King 6 and 60 Myr for NGC 1605. This indicates thatboth clusters are dynamically relaxed since these times are less than theestimated cluster ages. Galactic orbit analysis shows that both clusters formedoutside the solar circle and are members of the young thin-disc population.

CCD UBV and Gaia DR3 Analyses of Open Clusters King 6 and NGC 1605