Reduction of the measurements of the FON program plates with the use of USNO act data

Abstract

The method of reduction of plate measurements within the northern sky photographic survey program (FON) is described. The ACT Reference Catalogue was employed for the reductions of positions. The B_J magnitudes from the Tycho Catalogue were used for the calibration of the measured diameters of stars. The GSC1.1 catalogue was used to determine the (B-V) colours of stars. The USNO 2.0 R magnitudes were also used to determine of (B-R) colours of stars.