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astrometry – galaxies: active – reference systems

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How Accurate are SuperCOSMOS Positions?
Adam Schaefer, Richard Hunstead, Helen Johnston
Journal:

Publications of the Astronomical Society of Australia / Volume 31 / 2014

Published online by Cambridge University Press:

27 February 2014, e010
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Optical positions from the SuperCOSMOS Sky Survey have been compared in detail with accurate radio positions that define the second realisation of the International Celestial Reference Frame (ICRF2). The comparison was limited to the IIIaJ plates from the UK/AAO and Oschin (Palomar) Schmidt telescopes. A total of 1 373 ICRF2 sources was used, with the sample restricted to stellar objects brighter than BJ = 20 and Galactic latitudes |b| > 10°. Position differences showed an rms scatter of $0.16\text{ arcsec}$ in right ascension and declination. While overall systematic offsets were < $0.1\text{ arcsec}$ in each hemisphere, both the systematics and scatter were greater in the north.