Densification of the ICRF/HCRF in visible wavelengths

Details Densification of the ICRF/HCRF in visible wavelengths Densification of the ICRF/HCRF in visible wavelengths

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..603u&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

International Celestial Reference System

Scientific paper

With the release of the Hipparcos Catalogue and the IAU resolution designating its 100000 star subset as the HCRF the optical reference frame increased 20-fold in the number of stars over the FK5. For many applications even these 100000 stars are inadequate in spatial density and limiting magnitude. However Hipparcos is dense enough and deep enough to reduce many astrometric catalogs directly; the resulting data can be used to densify the HCRF and extend its magnitude limit.
The initial major densification efforts of the HCRF utilized the Tycho data culminating in the Tycho-2 Catalogue of 2.5 million stars. Over the last few years several groups have been working toward even greater densification. Some resulting catalogs such as the CMC 12 M2000 and SPM 2.0 are zonal covering selected areas of the sky. Others such as UCAC USNO B and GSC 2.3 aim at global coverage but with varying degrees of accuracy and magnitude regimes. Others namely DENIS and 2MASS are extending the HCRF into the near IR realm. The current state of many of these projects and what is expected in the next few years in terms of densification of the optical frame will be presented.

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