>> Is the V minus GSC difference is a systematic one for stars of that >> color? Sometimes there is a color-dependence, and other times not, depending on the field involved. I don't have the numbers in front of me, but I don't recall noticing a color-dependence for the GK Per field (or not one obvious compared to the internal scatter of the GSC magnitudes). Perhaps it would be worth looking at again. On the other hand, if the 118 S star is useful for observers, someone should simply measure it properly. \Brian