Testing the Hipparcos/ICRF link using radio stars

Details Testing the Hipparcos/ICRF link using radio stars Testing the Hipparcos/ICRF link using radio stars

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..612b&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

We have undertaken an effort to verify and improve the radio/optical frame link through connected element interferometer astrometry of radio stars. In our first epoch we observed 19 radio stars using the Very Large Array in A-configuration plus the Pie Town Very Long Baseline Array antenna (VLA+PT). Differences in right ascension and declination were computed between our VLA+PT data and the Hipparcos positions updated to our epoch (2000.94). A weighted least-squares fit to the position differences was performed and the three rotation angles between the radio and optical frames were determined. We founnd that the two frames are aligned to within the formal errors of approximately 3 milliarcseconds per axis. Presented here are the results of this work updated by more recent observations from our ongoing program.

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