AAS 207th Meeting, 8-12 January 2006
Session 117 SIM
Poster, Wednesday, 9:20am-6:30pm, January 11, 2006, Exhibit Hall

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[117.04] Radio Star Astrometry With Connected Element Interferometers

K. J. Johnston, D. A. Boboltz, A. L. Fey, R. A. Gaume, N. Zacharias (USNO)

We present the latest results from our program of radio star observations using the MERLIN and VLA+Pie Town interferometer arrays. These observations are part of a long-term (since 1978) program to obtain accurate astrometric radio positions, parallaxes, and proper motions for ~50 stars. Radio star astrometry can be used to connect the current realization of the International Celestial Reference Frame (ICRF) as defined by VLBI positions of extragalactic objects to future optical reference frames (e.g. that defined by the SIM PlanetQuest mission). We also compare our radio positions and proper motions to those determined by HIPPARCOS.

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