Improving the ICRF in the southern hemisphere

Details Improving the ICRF in the southern hemisphere Improving the ICRF in the southern hemisphere

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet...37f&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, Southern Hemisphere

Scientific paper

It is well known that the ICRF has a less than desirable density of sources on the sky, particularly in the southern hemisphere. To address concerns about the non-uniform distribution of ICRF sources and to monitor sources for structural variations, various observing programs have been initiated. In this paper, we concentrate primarily on two programs specifically aimed at improving the ICRF in the southern hemisphere. The U.S. Naval Observatory (USNO) currently has a joint program with the Australia Telescope National Facility (ATNF) for astrometry and imaging of southern hemisphere ICRF sources. Additionally, the IVS schedules regular CRF observations for the specific purpose of maintenance of the ICRF. In recent years, these CRF sessions have concentrated primarily on observations of sources in the southern hemisphere. Results to date of these dedicated observing programs are briefly described.

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