Physics
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990tgom.book.....t&link_type=abstract
Traitement global des observations méridiennes de l'Observatoire de Bordeaux., by Teixeira, R.. Bordeaux 1 Univ., 33 (France),
Physics
3
Scientific paper
Meridian observations are usually grouped in series which are reduced separately. The axis coordinates are fixed by reference stars, which define the system to which program stars are reduced. The author studies the possibility of reducing all observations at once in a single least squares problem, having as unknowns not only the instrumental parameters (constant for each series) but also the positions of all stars (reference and program stars). In this case all stars will contribute equally for the definition of the instrumental system. This process takes into account the fact that the positions of the stars which are common to various series are constant, in exactly the same way as in the reduction of photographic plates by the overlap technique. The author presents a relatively simple way of dealing with the system, which is both of huge dimension and singular. He gives also some results of this technique to two years of observations carried out with the photoelectric meridian circle of the Bordeaux Observatory.
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