Global reduction with proper motions for meridian observations

Details Global reduction with proper motions for meridian observations Global reduction with proper motions for meridian observations

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...333.1107t&link_type=abstract

Astronomy and Astrophysics, v.333, p.1107-1111 (1998)

Astronomy and Astrophysics

Astrophysics

4

Astrometry, Methods: Numerical

Scientific paper

When we deal with astrometric observations spread over periods longer than a few years, it is of major importance to take into consideration the proper motions of all objects involved in the reduction process. Not to consider such quantities, mainly when they are poorly known to the majority of the objects, may significantly degrade the final results of the reduction. In this paper, we present a way to treat this problem. As an example, we reduced a set of over 170000 observations made with the Bordeaux photoelectric automatic meridian circle, collected during almost ten years of work of the instrument. In our reduction model, proper motions were included as unknowns, along with positions and instrumental parameters. The method shown here, which we call global technique, is an extension of the overlap method introduced by Eichhorn (Eichhorn \cite{eic}), which was developed by many authors afterwards.

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