On the Impact of Correlation Information on the Orientation Parameters Between Celestial Reference Frame Realizations
In this study, we compared results of determination of the orientation angles between celestial reference frames realized by radio source position catalogues using three methods of accounting for correlation information: using the position errors only, using additionally the correlations between the right ascension and declination (RA/DE correlations) reported in radio source position catalogues published in the IERS format, and using the full covariance matrix. The computations were performed with nine catalogues computed at eight analysis centres. Our analysis has shown that using the RA/DE correlations only slightly influences the computed rotational angles, whereas using the full correlation matrices leads to substantial change in the orientation parameters between the compared catalogues.
KeywordsCelestial reference frame CRF orientation ICRF Radio source position catalogues VLBI
The authors are grateful to all the VLBI data analysts, who made their catalogues available for this study either via public access or via personal contact. We thank the anonymous referees for careful reading of the manuscript and useful comments and suggestions.
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