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Aims: We build a catalogue PPM-Extended (PPMX) on the ICRS system which iscomplete down to a well-defined limiting magnitude and contains the bestpresently available proper motions to be suited for kinematical studies in theGalaxy.  Methods: We perform a rigorous weighted least-squares adjustment ofindividual observations, spread over more than a century, to determine meanpositions and proper motions. The stellar content of PPMX is taken from GSC 1.2supplemented by catalogues like ARIHIP, PPM and Tycho-2 at the bright end. Allobservations have been weighted according to their individual accuracy. Thecatalogue has been screened towards rejecting false entries in the varioussource catalogues.  Results: PPM-Extended (PPMX) is a catalogue of 18,088,920 stars containingastrometric and photometric information. Its limiting magnitude is about 15.2in the GSC photometric system. PPMX consists of three parts: a) a surveycomplete down to R_U = 12.8 in the magnitude system of UCAC2; b) additionalstars of high-precision proper motions, and c) all other stars from GSC 1.2identified in 2MASS. The typical accuracy of the proper motions is 2mas/y for66 percent of the survey stars (a) and the high-precision stars (b), and about10 mas/y for all other stars. PPMX contains photometric information fromASCC-2.5 and 2MASS.

PPM-Extended (PPMX) - a catalogue of positions and proper motions