Three related comparisons
between photoelectric an visual magnitude are made: (1) photoelectric v vs mv
for 260 stars listed in the Revised Harvard Photometry, (2) photoelectric
magnitude (measured by author) vs chart magnitude for 183 stars on preliminary AAVSO charts, and (3) photoelectric magnitude (from
published literature) vs comparison star magnitude for 124 stars on standard AAVSO charts. It is clear from thes edata that
important improvements in sequence accuracy, and in the accuracy of the
resulting light curves, will be achieved with the expanded use of
photoelectrically measured comparison stars.