How Accurate are SuperCOSMOS Positions?

作者：Schaefer Adam^*; Hunstead Richard; Johnston Helen

来源：Publications of the Astronomical Society of Australia, 2014, 31: e010.

DOI：10.1017/pasa.2014.4

• astrometry
• galaxies: active
• reference systems

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 B-J = 20 and Galactic latitudes vertical bar b vertical bar > 10 degrees. Position differences showed an rms scatter of 0.16 arcsec in right ascension and declination. While overall systematic offsets were <0.1 arcsec in each hemisphere, both the systematics and scatter were greater in the north.

• 出版日期2014-2-27