The AAVSO Photometric All-Sky Survey (APASS) performed an allsky photometric survey in five filters: Johnson B and V, plus Sloan g′, r′, i′. The magnitudes range from 7th magnitude to about 17th magnitude. This catalog helps various research programs establish transformation between different filter systems and achieve conversion of photometry to more fundamental physical properties as it bridges the gap between Tycho2 and SDSS.

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