Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13q.614b&link_type=abstract
In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J
Astronomy and Astrophysics
Astronomy
Astrometry
Scientific paper
A methodology for the astrometric measurement of photographic plates making use of a scientific grade CCD camera was developed and tested on a Carte du Ciel plate. In order to measure a complete CdC plate a mosaic of 64 frames with partial overlap in both coordinates was taken. With the aim of evaluate the accuracy of stellar centroids a MAMA-based digitization of the same plate was employed as pattern. It was found a noticeable radial distortion produced by the optical system of the camera that was corrected. The reduction to celestial coordinates was performed by means of the block-adjustment technique using Tycho-2 as reference catalog. Differences with Tycho-2 suggest that the errors of CCD-based positions obtained from the CdC plate are between 0.20 and 0.25 arcseconds. These positions are intended to be employed in the determination of proper motions at few mas/yr level therefore allowing densification of the proper motions system in regions of interest of the sky up to photographic magnitude 14.5 (for CdC plates) using a relatively low cost device available at our own Observatory.
Bustos Fierro I. H.
Calderón Jesus H.
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