A Quick Method to Determine Extinction And Transformation Coefficients

A very Simple, quick method to determine atmospheric extinction and instrumental transformation cofficients, Using high and low two blue-red star pairs, is given in present paper. Our test shows that in general, this method not only is very simple and quick, but also can permit to obtain satisfaction resultes. In Table Ⅲ, 12 such pairs are given, they can be used by an observatory at the middle-north latitude zone.