Astrometric calibration

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The astrometric calibration, i.e. the transformation of the Cartesian coordinates x,y from the plates into the celestial coordinates, RA and DEC, is carried out by a python package called PyPlate which is currently being developed at the AIP in Potsdam (see Tuvikene et al. 2014 and Tuvikene, 2014). This script combines the programs SExtractor,, and SCAMP, and uses astrometric data from the fourth U. S. Naval Observatory CCD Astrograph Catalog (UCAC4).