All-Sky spectrally matched UBVRI-ZY and u'g'r'i'z' magnitudes for stars in the Tycho2 catalog
Andrew Pickles, \'Eric Depagne

TL;DR
This paper provides a comprehensive set of synthetic magnitudes, spectral types, and distances for millions of stars, enabling accurate automatic flux calibration of astronomical images across multiple photometric systems.
Contribution
It introduces a method for deriving synthetic photometry and calibrating zeropoints for various filter systems using a large star catalog, improving calibration accuracy and efficiency.
Findings
Achieved 1-3% zeropoint dispersions for multiple filter systems.
Estimated star magnitude errors are as low as 0.08 mags for some bands.
Provided a large database enabling automatic flux calibration in astronomical imaging.
Abstract
We present fitted UBVRI-ZY and u'g'r'i'z' magnitudes, spectral types and distances for 2.4M stars, derived from synthetic photometry of a library spectrum that best matches the Tycho2 BtVt, NOMAD Rn and 2MASS JHK_{2/S} catalog magnitudes. We present similarly synthesized multi-filter magnitudes, types and distances for 4.8M stars with 2MASS and SDSS photometry to g<16 within the Sloan survey region, for Landolt and Sloan primary standards, and for Sloan Northern (PT) and Southern secondary standards. The synthetic magnitude zeropoints for BtVt, UBVRI, ZvYv, JHK_{2/S}, JHK_{MKO}, Stromgren uvby, Sloan u'g'r'i'z' and ugriz are calibrated on 20 calspec spectrophotometric standards. The UBVRI and ugriz zeropoints have dispersions of 1--3%, for standards covering a range of color from -0.3 < V-I < 4.6; those for other filters are in the range 2--5%. The spectrally matched fits to Tycho2…
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