Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ala..conf...15b&link_type=abstract
Astronomy in Latin America, Second Meeting on Astrometry in Latin America and Third Brazilian Meeting on Fundamental Astronomy,
Astronomy and Astrophysics
Astronomy
Scientific paper
We have developed a methodology for the astrometric measurement of photographic plates making use of a CCD camera. In order to measure a complete 2deg × 2deg plate a mosaic of 8 × 8 frames with 50% overlap in both coordinates was taken. The segmentation and centering of stellar images was performed with SExtractor, and by means of our own software triple exposures were identified. No evidence of Kostinsky effect was found but a noticeable radial distortion produced by the optical system that was modeled and corrected. The reduction to celestial coordinates was performed by means of the block-adjustment technique, using Tycho-2 as reference catalogue. Differences with Tycho-2 suggest that the error of the positions derived is between 0"3 and 0"5. This accuracy can be improved with a better correction of the observed distortion, and maybe with the selection of the best astrometric quality Tycho-2 stars.
Bustos Fierro I. H.
Calderón Jesus H.
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