Can someone tell me where to find the most definitive catalog of Landolt UBVRI standard stars (primarily north, but equatorial and south are also needed)?
I've been using Vizier catalog J/AJ/146/131/standards but it seems to contain errors. Specifically 2MASS J15391619+0008545 is included twice and the second entry seems to relate to J16374581-0028236.
I need a truly definitive version of the Landolt data for automating calibration/transformation.
Thanks
Nigel