Hi Dave - > I am just a little confused about Tim's discussion of Andrew's thesis. > I don't understand how to do step (1) without knowing the colors for all > the stars and including a term in projected tan(ZD).
I think the solution to this is that the "template" images were taken at an airmass of 1.01. Also, since Andrew was looking at the Galactic bulge, completely crowded, he used the color per pixel instead of the color per object to find the extra offset in the astrometric remapping of template image at airmass=1.01 to science image at airmass=X.XX. This particular solution is almost certainly not sufficient for LSST. In particular, we will not be able to get all fields at zenith. Cheers, /\ _______________________________________________ LSST-data mailing list [email protected] http://www.lsstmail.org/mailman/listinfo/lsst-data
