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I'm pretty sure that I've mentioned on this list
that my priority was to get accurate photometry for
the UCAC stars; but perhaps it was another group. Sorry.
However, I think it is almost a perfect marriage
between the UCAC astrometric survey and the TASS
Mark IV capabilities. (plus, of course, the USNO connection...)
UCAC (USNO CCD Astrometric Catalog) uses an 8" telescope
and a 4kx4k Kodak CCD, and is doing a remarkable job
in mapping the southern sky. They will work up to +20
Dec from Chile, and then move to a northern site to
work downwards with considerable overlap. The current
plans are to move north early next year, so perhaps the
catalog timeframe is a little sooner than Tom suggests.
TASS is not an astrometric survey. Don't worry if
you only get arcsec coordinates; try to get the best
possible photometry instead.