摘要：The Kilodegree Extremely Little Telescope (KELT) has been surveying more than 70% of the celestial sphere for nearly a decade. While the primary science goal of the survey is the discovery of transiting, large-radii planets around bright host stars, the survey has collected more than 106 images, with a typical cadence between 10–30 minutes, for more than four million sources with apparent visual magnitudes in the approximate range 7 < V < 13. Here, we provide a catalog of 52,741 objects showing significant large-amplitude fluctuations likely caused by stellar variability, as well as 62,229 objects identified with likely stellar rotation periods. The detected variability ranges in rms-amplitude from ∼3mmag to ∼2.3mag, and the detected periods range from ∼0.1to 2000days. We provide variability upper limits for all other ∼4,000,000 sources. These upper limits are principally a function of stellar brightness, but we achieve typical 1σ sensitivity on 30 min timescales down to ∼5mmag at V ~ 8, and down to ∼43mmag at V ~ 13. We have matched our catalog to the TESS Input catalog and the AAVSO Variable Star Index to precipitate the followup and classification of each source. The catalog is maintained as a living database on the Filtergraph visualization portal at the URLhttps://filtergraph.com/kelt_vars.
