RE: Color transforms for small subset

["Gutzwiller, Michael" <mgutzwiller@lanvision.com>]

The transforms are based on the 5 night set I've described earlier and
are based on average magnitudes for the Landolt stars seen.  To be
eligible the star must have been seen on at least 4 of the 5 nights with
good photometry.

I too was surprised by the offset in I and will investigate further.

Mike G.

	-----Original Message-----
	From:	aah@nofs.navy.mil [SMTP:aah@nofs.navy.mil]
	Sent:	Tuesday, June 02, 1998 2:37 PM
	To:	tass@wwa.com
	Subject:	Re: Color transforms for small subset

	Mike G. gave a table of Landolt offsets for his mini-TASS
catalog.  Mike,
	was this the 4-night dataset, so that these measures are
averages for
	all 4 nights, or what?  I'm surprised there is a large zero
point offset
	for the I band; I would have expected numbers like the V
transform.  Perhaps
	it is just small number statistics.
	  However, your coeffients are in the same ballpark as the
numbers I
	derived for the SMSP exercise, so looks like you are heading in
the
	right direction.
	Arne