Hot Stuff for One Year (HSOY) - A 583 million star proper motion catalogue derived from Gaia DR1 and PPMXL
Martin Altmann, Siegfried Roeser, Markus Demleitner, Ulrich Bastian,, and Elena Schilbach

TL;DR
The paper presents HSOY, a large proper motion catalogue combining Gaia DR1 and ground-based data to provide improved astrometric information for over 583 million stars, bridging the gap before Gaia DR2.
Contribution
HSOY is a hybrid catalogue that enhances proper motion data by integrating Gaia DR1 positions with PPMXL data, offering a valuable resource before Gaia DR2.
Findings
Contains 583 million objects with proper motions.
Proper motion precisions range from <1 mas/yr to 5 mas/yr.
Provides a valuable dataset for immediate and pilot studies.
Abstract
Recently, the first installment of data from ESA's Gaia astrometric satellite mission (Gaia-DR1) was released, containing positions of more than 1 billion stars with unprecedented precision, as well as only proper motions and parallaxes, 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-DR1 and Gaia-DR2 releases and partly remedies the lack of proper motions in the former, HSOY ("Hot Stuff for One Year") was created as a hybrid catalogue between Gaia-DR1 and ground-based astrometry, featuring proper motions (but no parallaxes) for a large fraction of the DR1 objects. While not attempting to compete with future Gaia releases in terms of data quality or number of objects, the aim of HSOY is to provide improved proper…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Gamma-ray bursts and supernovae · Astronomical Observations and Instrumentation
