The USNO extragalactic reference frame link program

Details The USNO extragalactic reference frame link program The USNO extragalactic reference frame link program

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..611z&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

International Celestial Reference System

Scientific paper

The objective of this project is to improve the link between the radio and optical reference frames over the initial Hipparcos effort. The alignment of the radio-optical systems is important for absolute proper motions and source identification across the wavelength spectrum. The U.S. Naval Observatory (USNO) extragalactic reference frame link program includes all applicable (currently about 500) ICRF radio sources with optical counterparts. Observing from the Southern Hemisphere concluded with 14 runs utilizing the CTIO 0.9m telescope between October 1997 and January 2001. For the Northern Hemisphere a total of 8 runs was made through May 2003 utilizing the KPNO 2.1 and 0.9m telescopes. About four CCD frames are taken for each source at generally two different observing runs each. Contemporaneous to these deep CCD observing runs wide-field CCD frames are obtained by the USNO astrograph using the same narrow red bandpass (579-642 nm) providing a strong link to the Tycho-2 stars and thus the Hipparcos Catalogue Reference Frame (HCRF). The status of the program and first results are presented.

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