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CCD-Based Astrometric Measurement of Photographic Plates
We have developed a methodology for the astrometric measurement ofphotographic plates making use of a CCD camera. In order to measure acomplete 2°x 2° plate a mosaic of 8×8 frames with 50% overlap inboth coordinates was taken. The detection and centering of stellarimages was performed with SExtractor, and by means of our own softwaretriple exposures were identified. A noticeable radial distortionproduced by the optical system was found and corrected. The reduction tocelestial coordinates was performed by means of the block-adjustmenttechnique, using Tycho-2 as reference catalog. Differences with Tycho-2suggest that the errors of CCD-based positions obtained from the CdCplate are between 0. and 0.. Completeness of the catalogs obtained isalso discussed.
| Uniform survey of clusters in the southern Milky Way.
Abstract image available at:http://adsabs.harvard.edu/abs/1975AJ.....80...11V
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