vis: visual estimates;
vw: visual measures using wedge;
v* : visual measures using polarizing photometers;
pg: photographic estimates;
pgw: photographic plates measured with wedgy;
pg* : photographic plates measured with physical photometers;
pe : photoelectric measures;
-Ir : ?
ccd: charge coupled device;
ccdC:?
ccdR:?
C:?
V:?
2010-05-11 于京