Basic principles of scanning space astrometry

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Abstract

We outline the basic principles of scanning space astrometry, such as represented by Hipparcos, Gaia, and some other astrometric satellites planned or proposed. We explain the need for large-angle measurements, why these are essentially one-dimensional, how it is possible to determine absolute parallaxes, and why a Hipparcos-type scanning law is favourable. 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 be difficult to solve.

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Subject classification (UKÄ) – MANDATORY

  • Astronomy, Astrophysics and Cosmology
Original languageEnglish
Pages (from-to)109-114
JournalEAS Publications Series
Volume45
Issue numberGAIA: At the Frontiers of Astrometry
Publication statusPublished - 2011
Publication categoryResearch
Peer-reviewedYes