Volume 409, Number 1, October I 2003
|Page(s)||361 - 368|
|Section||Celestial mechanics and astrometry|
|Published online||17 November 2003|
Observatoire de Bordeaux, UMR 5804, CNRS/INSU, BP 89, 33270 Floirac, France
2 Instituto de Astronomia, Geofísica e Ciências Atmosféricas da Universidade de São Paulo, Caixa Postal 3386, 01060-970 São Paulo SP, Brazil
Corresponding author: J. I. B. Camargo, email@example.com
Accepted: 4 June 2003
In this paper we provide a major upgrade of the work presented in [CITE], 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 () to 70–140 mas (). For the proper motions, precisions range from 3 mas/year to about 15 mas/year, depending on magnitude and declination.
Key words: astrometry / reference systems
Based 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 (126.96.36.199) 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
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.