The Local Group, which means about 1% of the Milky Way stellar content.īesides the positional and kinematical information (position, parallax, proper motion, and about 1 billion objects in our Galaxy and The sky brighter than about magnitude 20, i.e. Gaia is scheduled for a launch in 2012 and over itsĥ-year mission will measure positions, parallaxes, and proper motions for every object in Undergone some changes during the study and design-development phases, the science case Presented the mission as it was approved in 2000. The main goal is to provide data to study the formation, dynamical,Ĭhemical, and star-formation evolution of the Milky Way. Gaia is an ESA mission that will chart a three-dimensional map of our Star images cross the focal plane in the direction indicated by Size 10 μm along scan by 30 μm across scan Superimposed on this common focal plane which features 7 CCD rows, 17 CCD strips, andġ06 large-format CCDs, each with 4500 TDI lines, 1966 pixel columns, and pixels of The viewing directions of both telescopes are The Gaia-like sky, planning ground-based complementary observations andįor building catalogues with auxiliary data for the Gaia data processing

Planning scientific exploitation of Gaia data, performing simulations of The provided dependencies among colours can be used for Gaia magnitudes have been estimated according to the magnitude and theĬonclusions. Finally, the performances of the predicted Isochrones using the Padova and BASTI models. The derived Gaia passbands have been used to compute tracks and Several ratios of total-to-selective absorption including absorption Sloan DSS colours yield lower residuals than using only one colour. Transformations involving two Johnson or two Metallicity for each absorption value in g − r and T eff < 4500 K, dispersions exist in gravity and A polynomialĮxpression for the relation between the effective temperature and the colour Reddening values, ranges of temperatures, surface gravities and metallicities. The most up-to-date information from industrial partners hasīeen used to define the nominal passbands, and based on the BaSe元.1 stellar spectralĮnergy distribution library, relationships were obtained for stars with different Systems (Johnson-Cousins, Sloan Digital Sky Survey, Hipparcos and G RVS bands) and colours from other commonly used photometric To do so, we provide relationshipsĪmong colours involving Gaia magnitudes (white light G, The purpose of this paper is to provide data and tools to predict how The scientific community needs to be prepared to analyse the dataįrom Gaia, one of the most ambitious ESA space missions, which is to be Science Operations Department of the European Space Agency,Īims. INAF, Padova Observatory, Vicolo dell’Osservatorio 5, 35122 Institut d’Estudis Espacials de Catalunya (IEEC),ĥ Niels Bohr Institute, Copenhagen University Juliane Maries Technology Centre, KeplerlAZ, Noordwijk, The Netherlands

Research and Scientific Support Department of the European Space Mora 7ĭepartament d’Astronomia i Meteorologia, Universitat deĮ-mail: de Ciències del Cosmos, ICC-UB, c/ Martí i Franquès 1, 08028 Astronomical objects: linking to databasesĬ.Including author names using non-Roman alphabets.Suggested resources for more tips on language editing in the sciences Punctuation and style concerns regarding equations, figures, tables, and footnotes

Hipparcos astrometry recomputed leuwen