Optical positions of four benchmark radio sources

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astrometry, Bl Lacertae Objects, Position (Location), Radio Sources (Astronomy), Astronomical Photography, Reference Stars

Scientific paper

Positions of the four radio sources 3C84, OJ287, 3C371, and BL Lac are given with internal accuracies of a few hundreds of arcsec. The positions are based on four or more plates per source. A quadratic transformation model was used for the reductions. No significant magnitude or color equation was found except for six plates of BL Lac, where the color term was included in the reduction. The results are compared with those obtained by other investigators.

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