Abstract
Two different strategies for reducing HIPPARCOS data are directly compared and their respective impact on the final precision of the HIPPARCOS Catalog is evaluated. These strategies are the FAST (Fundamental Astronomy by Space Techniques) Consortium's Baseline and GLOBUS procedures. The Baseline is already operating on satellite data; GLOBUS was invented as an alternative and more rigorous approach to the adjustment of the HIPPARCOS astrometric network. At present, FAST is supporting a possible introduction of GLOBUS in its data reduction chain. In order to make a true comparison, the two methods were applied to the same 1-year simulation of HIPPARCOS mission data. The comparison shows that the overall precision of the solution given by the GLOBUS approach is ∼ 20% better than the Baseline one.
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