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ESO/JAO Colloquium,Talk — The tale of the long uphill struggle of GBOT

The highly praised ESA Gaia satellite mission has already provided the astronomic community with high quality astrometric, photometric and other data or almost 2 billion stars, and will continue to do so over the next years.
08Nov

Información

Exponente: Martin Altmann and Sebastien Bouquillon
ARI, Heidelberg and SYRTE, Obs. de Paris/Universidad de Chile
Hora: 11:00 hrs.

ESO/JAO Colloquium,Talk — The tale of the long uphill struggle of GBOT

The highly praised ESA Gaia satellite mission has already provided the astronomic community with high quality astrometric, photometric and other data or almost 2 billion stars, and will continue to do so over the next years. As time goes by, the precision of the astrometry increases, with the number of measurements and the time-span during which these are obtained. Thus the correction of systematic effects in the data, such as aberration need to be handled to a point, where the conventional means do not suffice anymore.To accomplish this, a programme was conceived, to track the satellite with highly precise (20 mas) groundbased astrometry to deliver the required data for the optimisation of Gaia’s accuracy, called Ground Based Optical Tracking (GBOT).

This programme has faced many challenges and uncertainties, as well as set backs, but finally GBOT has come to the point, where its data are being included in the processing of the Gaia astrometry, since 2020. During this presentation, M. Altmann give an overview of the history of GBOT, and the steps taken to ensure final success, after many years of challenges. He will also report on a project searching for asteroids on the existing GBOT data, which has lead to observations of about 50,000 objects, of which about 20,000 were previously unknown. S. Bouquillon will decribe in detail the methods used and tools/codes developed in this frame work to reach the GBOT astrometric requirements.

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