Global treatment of the Bordeaux meridian observations

Details Global treatment of the Bordeaux meridian observations Global treatment of the Bordeaux meridian observations

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264..307t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 1, p. 307-313.

Astronomy and Astrophysics

Astrophysics

15

Astrometry, Astronomical Observatories, Accuracy, Astronomical Catalogs, Data Reduction, Declination, Iterative Solution

Scientific paper

This work presents the reduction and analysis of two years of observations made with the photoelectric meridian circle of the Bordeaux Observatory. Approximately 40,000 observations of 5000 objects are reduced by two techniques: the usual one, series-by-series, and the global method. The global problem is solved by iteration, where the classical solution is the first iteration. A full comparison between the results (instrumental parameters, positions, precisions), obtained with both techniques, and the computational details are presented. This comparison enables us to say, for example, that the global reduction improves the internal accuracy chiefly for the fainter and lower altitude objects. We also find some evidence of systematic errors in the FK 5 catalog and the behavior of the Bordeaux instrumental system is shown.

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