Survey of Surveys

Context. In the present-day panorama of large spectroscopic surveys, amount, diversity, and complexity available data continuously increase. The overarching goal studying formation evolution our Galaxy is hampered by heterogeneity instruments, selection functions, analysis methods, measured quantities. Aims. We present a comprehensive catalogue, Survey Surveys (SoS), built homogeneously merging radial velocity (RV) determinations largest ground-based surveys to date, such as APOGEE, GALAH, Gaia -ESO, RAVE, LAMOST, using reference. This pilot study serves prove concept test methodology that we plan apply in future stellar parameters abundance ratios well. Methods. have devised multi-staged procedure includes: (i) cross match between official cross-match algorithm, (ii) normalisation uncertainties repeated measurements or three-cornered hat method, (iii) calibration RVs function main on which depend (magnitude, effective temperature, surface gravity, metallicity, signal-to-noise ratio) remove trends zero point offsets, (iv) comparison with external high-resolution samples, RV standards Geneva-Copenhagen survey, validate homogenisation calibrate zero-point SoS catalogue. Results. provide homogenised catalogue containing almost 11 million stars, about half come exclusively from combination surveys. estimate accuracy be 0.16−0.31 km s −1 precision range 0.05−1.50 depending type star its survey provenance. open clusters high resolution homogeneous samples systemic 55 individual clusters. Additionally, median for 532 recently discovered data. Conclusions. publicly ready applied various research projects, clusters, Galactic archaeology, streams, characterisation planet-hosting name few. also include updates more sources versions SoS.