URAT is a follow-up project to the successful UCAC project using the same
astrograph but with a much larger focal plane array and a bandpass shifted
further to the red. Longer integration times and more sensitive, backside CCDs
allowed for a substantial increase in limiting magnitude, resulting in about
4-fold increase in the average number of stars per square degree as compared to
UCAC. Additional observations with an objective grating largely extend the
dynamic range to include observations of stars as bright as about 3rd magnitude.
Multiple sky overlaps per year result in a significant improvement in positional
precision as compared to UCAC.
If you use URAT1, please cite both Zacharias et al. (2015)
and the dataset Digital Object Identifier (DOI): 10.26131/IRSA19.
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URAT1 Overview
IRSA Catalog Search Tool: URAT1