Tass-Landolt Comparison

[Michael Sallman <msallman@pro-ns.net>]

I was cleaning out some of my old mail the other day, and I ran across a
thread from last November, where Tom and Michael R. had looked at MarkIV
data for 4 or 5 Landolt stars.
I decided to see what I could find in the database, now that Tom has
pretty much completed a full sweep of the northern sky.
I downloaded the Landolt list from
http://www.tass-survey.org/tass/catalogs/catalogs.html#landolt
and matched it to stars in the database. I came up
with 806 matches.
 From this list, I took a look at those that had at least 10 good
measurements in the database, and had V-R and R-I measurements in the
Landolt list. This reduced the number to 306 stars.
I have made some plots of the data (Landolt V vs. TASS V, etc.)
and put them on my website:
http://sallman.tass-survey.org/servlet/markiv/template/Landolt.vm
The g(x) lines are simple linear approximations of the data.

It looks like the TASS I values are almost always fainter than the 
Landolt I.

If anyone would like the data, just let me know.

Mike

P.S. I have finished loading the November and December data into the
database.