Table 2: Reference catalogues used for astrometric calibration.
Catalogue Acronym Reference Accuracy
USNO CCD Astrograph Catalog UCAC2 Zacharias et al. (2004) 0.06 arcsec
Two Micron All Sky Survey 2MASS Skrutskie et al. (2006) 0.10 arcsec
Sloan Digital Sky Survey SDSS-DR5 Adelman-McCarthy et al. (2007) 0.15 arcsec
USNO-B1.0 catalog USN0 Monet et al. (2003) 0.20 arcsec
Guide Star Catalog II GSC2.3.2 McLean et al. (2000) 0.30 arcsec

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