FAINT UBVRI STANDARD STAR FIELDS AT +50° DECLINATION

Precise and accurate CCD-based UBVRI photometry is presented for similar to 2000 stars distributed around the sky in a declination zone centered approximately at +50 degrees. Their photometry has been calibrated to the standard Johnson UBV and Kron-Cousins RI systems through observations of the UBVRI standard stars presented in the various works of Landolt. The magnitude and color range for these stars are 12 less than or similar to V less than or similar to 22 and -0.3 less than or similar to (B - V) less than or similar to 1.8, respectively. Each star averages 13 measures in each UBVRI filter from data taken on 41 different photometric nights obtained over a 21 month period. Hence, there now exists a network of faint UBVRI photometric standard stars centered on the declination zones delta = -50 degrees, 0 degrees, and +50 degrees.