Assessing the Photometric Calibration of the ASAS Survey

We compare bona fide calibrated mean VIC magnitudes of several hundred stars found in the CCD frames taken in 2012 during our photometric observations of 109 Cepheids and RR Lyrae type stars made at the South African Astronomical Observatory to the corresponding mean VIC magnitudes measured in the course of the ASAS survey to assess the quality of ASAS photometry and derive the appropriate transformation equations. We conclude that as far as the only serious caveat due to photometric errors, which range from similar to 0.05(m) for relatively bright stars to about similar to 0.15(m) for similar to 14(m) stars and translates into extra fractional distance error of 0.025 - 0.07