Determinations of optical positions for four extragalactic radio sources with CCD.

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Radio Sources: Optical Positions, Radio Sources: Astrometry, Radio Sources: Extragalactic, Radio Sources: Ccd Cameras

Scientific paper

From the twenty CCD observations made with the Schmidt telescope of Beijing Observatory, the optical positions of four radio sources 0851+202, 1228+126, 1442+101 and 1749+701 are given, using the method of single plate-constant and taking five catalogues as references: ACT, CMC, PPM, NPM and HIP. A comparison between the results and those of other authors is also made.

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