Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011hsa6.conf..709f&link_type=abstract
Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held
Astronomy and Astrophysics
Astrophysics
Scientific paper
In two years, the European Space Agency (ESA) will launch the Gaia mission.Gaia will observe all point-like sources in the sky between magnitude 6 and20, a total of more than a thousand million stars and planets. For thebrightest sources we will obtain parallaxes and yearly proper motions witha precision of 10 microarcseconds, while the precision will degrade to300 microarcseconds for thefaintest stars. The reduction of the astrometric data is a very complex andextensive task, which only can be undertaken in a collaboration betweenmany groups within the ESA member states.We describe the role of Spain and of the national supercomputing centre(CNS-BSC) in this work, and describe some of the most critical points inmodelling the instrument and in the observations.We describe the initial data treatment which must be carried out dailyduring the mission, and the process of repeated improvement of theintermediate data which is carried out several times, before reaching thefinal values. The fulfilment of these tasks, especially the latter, is atechnological challenge for the mission.
Castaneda Javier
Fabricius Claus
Portell Jordi
Torra Jordi
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