Astrometric measurements of radio sources optical counterparts. OATo campaign: some final results

Details Astrometric measurements of radio sources optical counterparts. OATo campaign: some final results Astrometric measurements of radio sources optical counterparts. OATo campaign: some final results

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..610b&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, Radio Sources, Optical Counterparts

Scientific paper

Positions to better than 0.1"" of optical counterparts of some extragalactic radio sources taken from the IERS list are obtained via photographic astrometry. These objects are part of an observational campaign carried out at Torino Observatory (OATo) a few years ago with the aim of improving the ERF optical link. The full data archive (about 350 plates for approximately 90 radio sources) has been digitized at Cagliari Observatory with the automatized Torino-Cagliari Measuring Machine (TO.CA.M.M.). Some preliminary results on the astrometric quality of these data have already been published; presently the reduction procedures are being revised also in view of high-quality reference catalogues recently made available and all the digitized images are consistently being re-calibrated. In this contribution we present some final results on the stability of TO.CA.M.M. discuss the adopted calibration methods and give precise positions in the ICRF system of a few selected targets.

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