Extension of the ICRF for selected areas down to the 16th magnitude - II

Details Extension of the ICRF for selected areas down to the 16th magnitude - II Extension of the ICRF for selected areas down to the 16th magnitude - II

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...409..361c&link_type=abstract

Astronomy and Astrophysics, v.409, p.361-368 (2003)

Astronomy and Astrophysics

Astrophysics

7

Astrometry, Reference Systems

Scientific paper

In this paper we provide a major upgrade of the work presented in \citet{cam}, aiming at the extension of the ICRF at optical wavelengths in regions of special astronomical interest, using observations from the Bordeaux and Valinhos meridian circles. Along with the new fields, the main differences, when compared to the first release, are: a much larger sky coverage, the replacement of the AC2000 by its upgraded version AC2000.2 as one of the first epoch astrometrical sources, inclusion of Tycho-2 and 2MASS photometry when available, and the correction for a magnitude equation on the Valinhos right ascension system as well. The resulting catalogue contains 678 828 entries with positional external precisions, on both coordinates, ranging from 50-60 mas (V<=13.5) to 70-140 mas (13.5Based on observations made with the CCD meridian circle at the Bordeaux Observatory, Floirac - France. Based on observations made with the CCD meridian circle at the Abrahão de Moraes Observatory, Valinhos - Brazil. Based on measurements made with the MAMA automatic measuring machine.
Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/409/361, and Tables 1 and 3 are only available in electronic form at http://www.edpsciences.org
his paper was prepared before the release of the all-sky 2MASS survey.

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