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Abstract: Gaia is a satellite mission of the ESA, aiming at absolute astrometricmeasurements of about one billion stars all stars down to 20th magnitude, withunprecedented accuracy. Additionally, magnitudes and colors will be obtainedfor all these stars, while radial-velocities and spectral properties will bedetermined only for bright objects V<17.5. At 15th magnitude Gaia aims at anangular accuracy of 20 microarcseconds muas. This goal can only be reached ifthe geometry of the telescopes, the detectors, and the pointing of Gaia at eachmoment -attitude- can be inferred from the Gaia measurements itself with muasaccuracy.

Author: Stefan Jordan


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