VLA Radio Star Measurement of the Rotation of the Hipparcos Frame with Respect to the ICRF

Details VLA Radio Star Measurement of the Rotation of the Hipparcos Frame with Respect to the ICRF VLA Radio Star Measurement of the Rotation of the Hipparcos Frame with Respect to the ICRF

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e..37b&link_type=abstract

Nomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 200

Astronomy and Astrophysics

Astronomy

Scientific paper

The Very Large Array (VLA), linked with the Pie Town Very Long Baseline Array antenna, hase been used to determine astrometric positions of 46 radiostars in the International Celestial Reference Frame (ICRF). Positions were obtained in the ICRF directly through phase referencing of the stars to nearby ICRF quasars whose positions are accurate at the 0.25 mas level. Radio star positions are estimated to be accurate at the 10 mas level, with position errors approaching a few milli-arcseconds for some of the stars observed. The measured positions were combined with previous measurements taken from as early as 1978 to obtain proper motion estimates for all 46 stars with average uncertainties of 1.7 mas/yr. We compared reference frames produced from our radio star positions and the Hipparcos Catalogue data, and find consistency in the frames on the 1-sigma level, with errors of 2.7 mas per axis for the orientation angles at our mean epoch of 2003.78. No significant spin is found between our radio data frame and the Hipparcos Celestial Reference Frame (HCRF) with largest rotation rates of +0.55 and -0.41 mas/yr around the x and z axes, respectively, with 1-sigma errors of 0.36 mas/yr. Thus, our results are consistent with a non-rotating Hipparcos frame with respect to the ICRF.

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