CTIO 0.9m observations of ICRF optical counterparts

Details CTIO 0.9m observations of ICRF optical counterparts CTIO 0.9m observations of ICRF optical counterparts

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008iaus..248..332z&link_type=abstract

A Giant Step: from Milli- to Micro-arcsecond Astrometry, Proceedings of the International Astronomical Union, IAU Symposium, Vol

Astronomy and Astrophysics

Astronomy

3

Astrometry, Reference Systems, Catalogs, Quasars: General

Scientific paper

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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