A Proposed Astrometric Observing Program for Densifying the ICRF in the Northern Hemisphere

Details A Proposed Astrometric Observing Program for Densifying the ICRF in the Northern Hemisphere A Proposed Astrometric Observing Program for Densifying the ICRF in the Northern Hemisphere

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ivsg.conf..168c&link_type=abstract

International VLBI Service for Geodesy and Astrometry: 2000 General Meeting Proceedings, p. 168

Astronomy and Astrophysics

Astronomy

2

Very Long Base Interferometry, Northern Hemisphere, Celestial Reference Systems, Astrometry, Geodetic Coordinates, Radio Sources (Astronomy), Jodrell Bank Observatory, Very Large Array (Vla)

Scientific paper

The International Celestial Reference Frame (ICRF) could be of significant importance to the astronomy community for observing weak objects angularly close to ICRF sources with the phase-referencing technique. However, the current distribution of the ICRF sources is found to be largely non-uniform, which precludes the wide use of the ICRF as a catalog of calibrators for phase-referencing observations. We show that adding 150 new sources at appropriate sky locations would reduce the distance to the nearest ICRF source for any randomly-chosen location in the northern sky from up to 13 deg to up to 6 deg, close to the requirement of the phase-referencing technique. Accordingly, a set of 150 such sources, selected from the Jodrell Bank-VLA Astrometric Survey and filtered out using the Very Long Baseline Array Calibrator Survey, has been proposed for observation to the European VLBI Network (EVN) extended with additional geodetic stations. The use of the EVN is essential to this project since most of the new sources will be weaker and thus difficult to observe with standard geodetic networks.

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