Last Updated Jan 2001
© 2001 The Association of Universities for Research in Astronomy, Inc.
All Rights Reserved.
CASB maintains an archive of several thousand
Schmidt survey plates in a secure, environmentally
controlled plate vault. Original plates
of the POSS-II and SES surveys pass through our facility for digitization
on one of our two GAMMA scanning machines.
These machines, which started life in 1983 as standard Perkin-Elmer
PDS 2020G microdensitometers, were modified in the early 1990s for
multichannel operation. Each can automatically
scan an entire Schmidt plate at 1
arcsecond resolution in less than seven hours.