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The optical UBVRI photometric analysis has been established using SLOANDIGITAL SKY SURVEY (SDSS database) in order to estimate the astrophysicalparameters of poorly studied open star cluster IC 2156. The results of thepresent study are compared with a previous one of ours, which relied on the2MASS JHK infrared photometry. The stellar density distributions andcolor-magnitude diagrams of the cluster are used to determine the geometricalstructure; limited radius, core and tidal radii, the distances from the Sun,from the Galactic plane and from the Galactic center. Also, the mainphotometric parameters; age, distance modulus, color excesses, membership,total mass, luminosity, mass functions and relaxation time; have beenestimated.

Photometric study of IC 2156