Yadav, R. K. S.Sagar, Ram2012-03-072012-03-072011-07-06http://hdl.handle.net/11007/815We present the UBV RI CCD photometry in the region of the open cluster NGC 2421. Radius of the cluster is determined as ∼ 3′ .0 using stellar density profile. Our Study indicates that metallicity of the cluster is Z ∼ 0.004. The reddening E(B − V ) = 0.42±0.05 mag is determined using two colour (U − B) versus (B − V ) diagram. By combining the 2MASS JHK data with the optical data we determined E(J −K) = 0.20±0.20 mag and E(V −K) = 1.15±0.20 mag for this cluster. Colour- excess diagrams show normal interstellar extinction law in the direction of the cluster. We determined the distance of the cluster as 2.2±0.2 Kpc by comparing the ZAMS with the intrinsic CM diagram of the cluster. The age of the cluster has been esti- mated as 80±20 Myr using the stellar isochrones of metallicity Z = 0.004. The mass function slope x = 1.2±0.3 has been derived by applying the corrections of field stars contamination and data incompleteness. Our analysis indicate that the cluster NGC 2421 is dynamically relaxed.enIndividual: NGC 2421Stars: Interstellar extinctionluminosity functionStar clusterHR diagramMass function, mass segregationArticle