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Basic principles of scanning space astrometry

Published online by Cambridge University Press:  15 February 2011

L. Lindegren
Affiliation:
Lund Observatory, Lund University, Box 43, 22100 Lund, Sweden
U. Bastian
Affiliation:
Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12–14, 69120 Heidelberg, Germany
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Abstract

We outline the basic principles of scanning space astrometry, such as represented byHipparcos, Gaia, and some other astrometric satellites planned or proposed. We explain theneed for large-angle measurements, why these are essentially one-dimensional, how it ispossible to determine absolute parallaxes, and why a Hipparcos-type scanning law isfavourable. We discuss the choice of the basic angle between the two viewing directions,the principle of self-calibration, and why the resulting numerical problem must bedifficult to solve.

Type
Research Article
Copyright
© EAS, EDP Sciences 2011

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References

Références

Bastian, U., & Röser, S., 1993, PPM Star Catalogue (South) (Heidelberg: Spektrum)
Benedict, G.F., MacArthur, B.E., Feast, M.W., et al., 2007, AJ 133, 1810 CrossRef
ESA, 1997, The Hipparcos and Tycho Catalogues, SP–1200 (Noordwijk: ESA)
Makarov, V.V., 1998, A&A, 340, 309
Perryman, M., 2009, Astronomical Applications of Astrometry: Ten years of exploitation of the Hipparcos satellite data (Cambridge: Cambridge University Press)
Röser, S., & Bastian, U., 1991, PPM Star Catalogue (North) (Heidelberg: Spektrum)