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CTIO 0.9m observations of ICRF optical counterparts

Published online by Cambridge University Press:  01 October 2007

M. I. Zacharias  and
N. Zacharias
M. I. Zacharias
Affiliation:
U. S. Naval Observatory, 3450 Mass. Ave. NW, Washington, DC 20392, USA email: miz@usno.navy.mil, nz@usno.navy.mil
N. Zacharias
Affiliation:
U. S. Naval Observatory, 3450 Mass. Ave. NW, Washington, DC 20392, USA email: miz@usno.navy.mil, nz@usno.navy.mil
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Abstract

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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.

Keywords

astrometryreference systemscatalogsquasars: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 332 - 333
Copyright
Copyright © International Astronomical Union 2008

References

Zacharias, M. I., Zacharias, N., & Rafferty, T. J. 2003, in Gaume, Ralph, McCarthy, Dennis, Souchay, Jean (eds.), The International Celestial Reference System, Maintenance and Future Realizations, Proc. of IAU General Assembly XXV, Joint Discussion 16, Sydney, AUS (Washington) p. 188Google Scholar
Zacharias, M. I. & Zacharias, N. 2005, in Seidelmann, P. Kenneth & Monet, Alice K. B. (eds.), Astrometry in the Age of the Next Generation of Large Telescopes, Proc. meeting at Lowell Observatory, Flagstaff, USA (San Francisco: ASP-CS 338) p. 184Google Scholar
Zacharias, N., Urban, S. E., Zacharias, M. I., Wycoff, G. L., Hall, D. M., Monet, D. G., & Rafferty, T. J. 2004, AJ 127, 3043CrossRefGoogle Scholar