Re: weak pixels, etc.

[<aah@nofs.navy.mil>]

Andrew asked where to get the UCAC catalog.  The main contact
is Norbert Zacharius (nz@pisces.usno.navy.mil) who can
send you a CD of UCAC1, the first version of the UCAC catalog
that contains stars from -20 southward.  UCAC2 is due to be
released sometime soon that will extend that to +25.  UCAC3
won't be released for a while as they are actively taking data
here at NOFS.  The web site is
http://ad.usno.navy.mil/ucac/
I have a version, without proper motion, in USNO-A format at
ftp://ftp.nofs.navy.mil/pub/outgoing/aah/ucac1

  I still don't understand the problem with weak pixels.
Andrew says:
>Not in this case! The defect is hard to see on both the Darks
>and the Flats but is much more obvious (i.e. I found it when I
>knew exactly where to look) on an actual image. It looks as though
>electrons smear out over the full affected length of the column
>(or is that row? It's vertical on my plot: AXIS2 direction)
This doesn't make sense to me, unless what he is experiencing is
blooming.  I'd like to see four images posted:  a raw, a flat,
a dark, and the processed image for one of these cases.  Again,
processing is supposed to make all pixels equal.  If this is not
the case, then something is wrong.
Arne