http://arxiv.org/abs/1603.08670
One of the possible strategies for linking the optical Gaia Celestial Reference Frame (GCRF) to the VLBI-based International Celestial Reference Frame (ICRF) is using radio stars in a manner similar to that used for linking HIPPARCOS Celestial Reference System (HCRF) to ICRF. A reachable precision of the orientation angles between GCRF and ICRF frames was estimated through Monte Carlo simulation. Supposing the radio stars position uncertainty obtained by VLBI in the range of 0.1 to 4 mas, and Gaia position uncertainty in the range of 0.055 to 0.4 mas, depending in the first place on the brightness of radio star in radio and optics and number of VLBI observations, the orientation angles uncertainty will be 0.02 to 0.66 mas for 46 radio stars used, and 0.01 to 0.39 mas for 138 radio stars used. Properly organized VLBI observing program on radio stars observations can allow to tie GCRF to ICRF with the accuracy better than 0.1 mas.
Z. Malkin
Wed, 30 Mar 16
32/48
Comments: N/A
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