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RR Lyrae stars are an important and widely used tracer of the most ancientpopulations of our Galaxy, mainly due to their standard candle nature. Theavailability of large scale surveys of variable stars is allowing us to tracethe structure of our entire Galaxy, even in previously inaccessible areas likethe Galactic disc. In this work we aim to provide an empirical assessment ofthe completeness of the three largest RR Lyrae catalogues available: Gaia DR2,PanSTARRS-1 and ASAS-SN-II. Using a joint probabilistic analysis of the threesurveys we compute 2D and 3D completeness maps in each survey's full magnituderange. At the bright end (G<13) we find ASAS-SN-II and Gaia are near 100%complete in RRab at high latitude (|b|>20deg); ASAS-SN-II has the bestcompleteness at low latitude for RRab and at all latitudes for RRc. At thefaint end (G>13), Gaia DR2 is the most complete catalogue for both RR Lyraetypes, at any latitude, with median completeness rates of 95% (RRab) and >85%(RRc) outside the ecliptic plane (|\beta|>25deg). We confirm a high and uniformcompleteness of PanSTARRS-1 RR Lyrae at 91% (RRab) and 82% (RRc) down to G~18,and provide the first estimate of its completeness at low galactic latitude(|b|<20deg) at an estimated median 65% (RRab) and 50-60% (RRc). Our results arepublicly available as 2D and 3D completeness maps, and as functions to evaluateeach survey's completeness versus distance or per line-of sight.

Empirical completeness assessment of the Gaia DR2, Pan-STARRS 1 and ASAS-SN-II RR Lyrae catalogues