Dear deenny,
As the mannual of Pinpoint said:In order to provide at least some photometric data, PinPoint uss heuristics to transform the magnitudes from the star catalogs into something like UBVRI. These heuristics vary by catalog. If you need info on a particular catalog please feel free to contact DC-3 Dreams.
How can I get these heuristics in the forum.
Best wishes
Geliang