Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e..34a&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
Results on improvement of linking optical and radio reference frames are discussed. For 300 extragalactic radio sources (ERS) fields, about 2500 CCD frames, with a mean of 6-7 frames per field were used. The analysis of optical positions of 213 ERS in the declination zone from -40° to +80° showed standard errors of 38 and 37 mas in right ascension and declination, respectively. The astrometric reductions were mainly made by using reference stars from UCAC2 and USNOB1.0 catalogues. The catalogue obtained is basic of the refinement of the mutual orientation angles between the optical and radio systems. For this purpose the positions of 142 ERS with the help of UCAC2 were used. A comparison between optical and radio positions of the ERS were made. The differences allowed us to obtain the intermediate internal estimation of link between optical and radio reference frames at an accuracy level of 5-6 mas. The angle values are: ω[x]= -4.1±6.1, ω[y]= 1.9±5.8, ω[z ]= 12.4±4.9 mas. A comparison of the results presented with those of other investigations was made.
Aslan Zafer
Gumerov R.
Jin Wenlong
Khamitov Irek
Maigurova Nadezhda
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