The construction of the Large Quasar Astrometric Catalogue (LQAC)

International audienceWe gather the 12 largest quasar catalogues (4 from radio interferometry programs, 8 from optical survey) and we carry out systematic cross-identifications of the objects to obtain their best position estimates,and providing physical information at both optical and radio wavelenghts. This catalogue compilation designated LQAC, give equatorial coordinates of 113 666 quasars with 9 photometry magnitude, 5 radio fluxes, redshift and absolute magnitude