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.
| Original language | English |
|---|---|
| Pages (from-to) | 109-114 |
| Journal | EAS Publications Series |
| Volume | 45 |
| Issue number | GAIA: At the Frontiers of Astrometry |
| DOIs | |
| Publication status | Published - 2011 |
Subject classification (UKÄ)
- Astronomy, Astrophysics and Cosmology