Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...258...60v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 1, p. 60-69.
Astronomy and Astrophysics
Astrophysics
18
Accuracy, Data Reduction, Great Circles, Hipparcos Satellite, Satellite Observation, Satellite Orientation, Data Smoothing, Least Squares Method, Root-Mean-Square Errors
Scientific paper
In this paper some of the results of the great-circle reduction in the two data reduction consortia (NDAC and FAST) are presented. It is shown that the root-mean-square (rms) error of the great-circle abscissa of stars brighter than 10 mag is between 3-5 milli-arcsec. This is as was expected before launch, even in spite of the fact that the data-sets are shorter in the revised mission. There is a large positive correlation between the abscissa of stars separated by a multiple of the basic angle. Moreover, the great-circle results are affected by systematic errors at the beginning of the reductions. This is confirmed by intercomparisons between the two consortia. Finally, it is shown that the along-scan attitude of the Hipparcos satellite can be described with a few hundred parameters with milli-arcsec accuracy.
Petersen Carsten
van der Marel Hans
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