Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-11-16
In: Measuring the Future, Proc. Fifth IVS General Meeting, A. Finkelstein, D. Behrend (Eds.), 2008, 275-278
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
5 pp., presented at the 5th IVS General Meeting, St. Petersburg, Russia, 3-6 March 2007
Scientific paper
In 2007, a joint IERS/IVS Working Group has been established to consider practical issues of creating the next ICRF generation, ICRF-2. The goal of the WG is to seek after ways to improve the existing ICRF. In this study we investigate a possibility of ICRF improvement by means of using combined ICRF catalogue instead of a catalogue computed in a single analysis centre, even though using most advanced models and software. In this work, we present a new version of Pulkovo combined catalogue of radio source positions computed using the method proposed in \cite{SokMal07}. Radio source catalogues that were submitted in 2007 in the framework of the WG activity were used as input for mutual comparison and combination. Four combined catalogues have been calculated: Two first of them provide a stochastic improvement of the ICRF, and last two of them allow us to account also for systematic errors in the current ICRF version.
Malkin Zinovy
Sokolova Julia
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