VI PHOTOMETRY OF THE GALACTIC CLUSTER BERKELEY-66

A colour magnitude diagram (CMD) extending to V similar or equal to 19 mag is given for 444 stars in the region of the galactic cluster Berk eley 66. The V and I photometry of a nearby field is also reported. Th is object appears very faint, highly contaminated by foreground stars and very reddened. The apparent distance modulus (m - M) and the colou r excess E(V-I) are guessed to be 17.5 and 1.1, respectively, with an uncertainty of at least 30%. Adopting these values the comparison of t he CMD with theoretical isochrones from the Padova group provides an a ge around 1.0 Gyr.