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Recently, the first installment of data from ESA's Gaia astrometric satellitemission (Gaia-DR1) was released, containing positions of more than 1 billionstars with unprecedented precision, as well as only proper motions andparallaxes, however only for a subset of 2 million objects. The second release,due in late 2017 or early 2018, will include those quantities for most objects.In order to provide a dataset that bridges the time gap between the Gaia-DR1and Gaia-DR2 releases and partly remedies the lack of proper motions in theformer, HSOY ("Hot Stuff for One Year") was created as a hybrid cataloguebetween Gaia-DR1 and ground-based astrometry, featuring proper motions (but noparallaxes) for a large fraction of the DR1 objects. While not attempting tocompete with future Gaia releases in terms of data quality or number ofobjects, the aim of HSOY is to provide improved proper motions partly based onGaia data, allowing some studies to be carried out just now or as pilot studiesfor later larger projects requiring higher-precision data. The HSOY cataloguewas compiled using the positions taken from Gaia-DR1 combined with the inputdata from the PPMXL catalogue, employing the same weighted least-squarestechnique that was used to assemble the PPMXL catalogue itself. Results. Thiseffort resulted in a four-parameter astrometric catalogue containing583,000,000 objects, with Gaia-DR1 quality positions and proper motions withprecisions from significantly less than 1 mas/yr to 5 mas/yr, depending on theobject's brightness and location on the sky.

Hot Stuff for One Year (HSOY) - A 583 million star proper motion catalogue derived from Gaia DR1 and PPMXL