MIGNARD , François

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Gaia is before all a survey mission designed to observe the sky in a continuous manner. The sky coverage results from the spin of the satellite over a period of 6h, combined with a much slower motion of the spin axis, allowing after six months complete sky coverage. The CCD counts are stored on-board and sent to the ground station every day...

Gaia is due for launch in the third quarter of 2013 and will open a new page in fundamental astronomy. The astrometric accuracy achievable of about 20 muas/yr at G=15 to below 10 muas/yr at the bright end will permit to know the positions of millions stars with mas accuracy almost 100 years back in time. I will present the current expectations...

I will present the current status of the Gaia project, both from the viewpoint of the spacecraft manufacturing and the data analysis preparation. I'll put special emphasis on the acquisition peculiarities for the solar system alert system impacting on the quick availability of the data.

The ESA astrometric mission Gaia, due for launch in late 2011, will observe a very large number of

Since the beginning of its scientific programme, in mid-2014, the ESA space mission Gaia has regularly scanned the whole scan, providing astrometry, spectrometry, and spectro-photometry, of about a billion of stars and also Solar System Objects (SSOs). Although it is not specifically designed for observation of moving objects, the Gaia...

The ESA astrometric mission Gaia, due for launch in late 2011, will observe a very large number of asteroids (~ 350,000 down to the magnitude 20), most from the main belt, with an unprecedented positional precision (at the sub-milliarcsecond level). Such high-precision astrometry will enable to considerably improve the orbits of a large number...

In the processing of the Hipparcos data, relativistic effects in the propagation of light, like the aberration and the bending of light rays, were introduced at an early level in the modelling. Thanks to the accumulation of very accurate measurements of star positions at various elongations from the Sun, it was possible to assess by how much...