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for the main stars in each of their calibration fields, which were chosen to match Landolt. Allyn has a website with more photometry. Other than that, APASS DR9 will include grizY calibration of that field, but it won't be available for a couple of months.
See Smith, et al.
http://adsabs.harvard.edu/abs/2002AJ....123.2121S
for the main stars in each of their calibration fields, which were chosen to match Landolt. Allyn has a website with more photometry. Other than that, APASS DR9 will include grizY calibration of that field, but it won't be available for a couple of months.
Arne
Thanks Arne.
I am in dilemma whether to wait APASS or search site Allyn, I just need 34 stars of sa98.
here find what I said Arne.
here is the page with fields landolt sloan
http://www-star.fnal.gov/NorthEqExtension_ugriz/index.html
here's the file
http://www-star.fnal.gov/NorthEqExtension_ugriz/Data/usno40stds.clean.v…
there are also other fields in the south, even if others already had them.
http://www-star.fnal.gov/Southern_ugriz/New/index.html