CTIO 0.9m observations of ICRF optical counterparts

We present astrometric results from 7 observing runs at the Cerro Tololo Interamerican Observatory (CTIO) 0.9m telescope of 197 extragalactic reference frame sources, selected from the original International Celestial Reference Frame (ICRF) catalog. This is part of the U.S. Naval Observatory (USNO)...

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Bibliographic Details
Published inProceedings of the International Astronomical Union Vol. 3; no. S248; pp. 332 - 333
Main Authors Zacharias, M. I., Zacharias, N.
Format Journal Article
LanguageEnglish
Published Cambridge, UK Cambridge University Press 01.10.2007
Subjects
Astronomy
Contributed Papers
USA
quasars: general
catalogs
astrometry
reference systems
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Summary:We present astrometric results from 7 observing runs at the Cerro Tololo Interamerican Observatory (CTIO) 0.9m telescope of 197 extragalactic reference frame sources, selected from the original International Celestial Reference Frame (ICRF) catalog. This is part of the U.S. Naval Observatory (USNO) reference frame link program. Contemporaneous to the CTIO deep imaging, wide-field CCD data were taken with the USNO Twin Astrograph to provide accurate secondary reference stars in the 13 to 16 mag range. The optical positions are on the Hipparcos system (via Tycho-2 stars). The unweighted, mean RMS of positional differences ‘optical–radio’ for a single source is 28 and 25 mas for RA and Dec, respectively.
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ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921308019509