John, Thanks for responding.
So, which catalogs (accessible through CDC) are photometric catalogs? Also, if none is, are there good photometric catalogs on-line? Thanks, Gennady --- In [email protected], John Mahony <[EMAIL PROTECTED]> wrote: > > These were intended as astrometric catalogs, not photometric. To quote from > "read.pht", the readme file on the USNO's website for the photometric data in > the USNO-A1.0 catalog: > > ----------------------------------------- > Summary: > > The photometric calibration of USNO-A1.0 is about as poor as one can > have and still claim that the magnitudes mean something. > ..... > -------------------------------------- > > -John > > > > --- "G. G." <[EMAIL PROTECTED]> wrote: > > > Often, I use catalogs USNO-A and USNO-B to identify faint stars. > > However, on many occasions these catalogs do not agree. Often, the > > difference is quite large (1+ magnitudes). Does anyone know which of > > these catalogs is more accurate? > > > > Thanks, > > Gennady > > > > > ______________________________________________________________________ ______________ > Never miss an email again! > Yahoo! Toolbar alerts you the instant new Mail arrives. > http://tools.search.yahoo.com/toolbar/features/mail/ >
