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Gaia A Stereoscopic Census of our Galaxy rssd.esat

2. Gaia: Design Considerations. Astrometry (V < 20):completeness to 20 mag (on-board detection) ? 109 starsaccuracy: 10?25 ?arcsec at 15 mag (Hipparcos: 1 milliarcsec at 9 mag)scanning satellite, two viewing directions? global accuracy, with optimal use of observing timeprinciple: global astro

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Gaia A Stereoscopic Census of our Galaxy rssd.esat

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