--- Bob Rose <[EMAIL PROTECTED]> wrote:
>
> As far as the star catalogs
> the Hubble Guide Star catalog will get you down to mag 16 if you need
> more you may want to get USNO-A or the smaller USAC2 which go to
> about mag 18.
> Look at http://cdsweb.u-strasbg.fr/cats/Cats.htx for more info and a
> source for the catalogs. If you have good Internet access, the newest
> version of CdC supports the USNO-B1 catalog. Which is will get to
> Vmag of 21.
You'll need a very fast connection to download USNO-A2 in a reasonable
time (6GB), and USNO-B1 is far worse (80GB), but small fields of either
(or the guide star catalog) can be downloaded automatically with the
"internet resources" feature.
USNO-B2 has only twice the stars of A2, less than a magnitude deeper.
The much larger byte count is due to B1 containing much more info on
each star. So A2 would be much more convenient.
UCAC2 is incomplete- large chunks of the northern sky are still
missing, so it might not have the area around M51.
-John
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