Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet....3m&link_type=abstract
In: Journées 2004 - systèmes de référence spatio-temporels. Fundamental astronomy: new concepts and models for high accuracy obs
Astronomy and Astrophysics
Astronomy
1
International Celestial Reference Frame, Very Long Baseline Interferometry
Scientific paper
The VLBI data and analysis leading to the ICRF were completed in 1995. Since then there have been considerable refinements in both areas. A regular monitoring program has begun to increase the data set for identified stable and potentially stable sources. Several steps need to be taken in the next few years to generate the next radio realization of the ICRS. These include: a) enhancement of the data set for possible defining sources, b) comparison of source catalogues from VLBI analysis centers using a variety of approaches and software to identify systematic errors, c) time series analysis of past and as-available data to identify the set of defining sources for the next realization, d) discussion and decision on the final analysis configuration, particularly for the data to be included, troposphere modeling, treatment of unstable sources, and whether a combination of normal matrices of individual solutions is better than a single selected solution.
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