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The K2 Mission uses the Kepler spacecraft to obtain high-precision photometryover ~80 day campaigns in the ecliptic plane. The Ecliptic Plane Input Catalog(EPIC) provides coordinates, photometry and kinematics based on a federation ofall-sky catalogs to support target selection and target management for the K2mission. We describe the construction of the EPIC, as well as modifications andshortcomings of the catalog. Kepler magnitudes (Kp) are shown to be accurate to~0.1 mag for the Kepler field, and the EPIC is typically complete to Kp~17(Kp~19 for campaigns covered by SDSS). We furthermore classify 138,600 targetsin Campaigns 1-8 (~88% of the full target sample) using colors, proper motions,spectroscopy, parallaxes, and galactic population synthesis models, withtypical uncertainties for G-type stars of ~3% in Teff, ~0.3 dex in log(g), ~40%in radius, ~10% in mass, and ~40% in distance. Our results show that starstargeted by K2 are dominated by K-M dwarfs (~41% of all selected targets), F-Gdwarfs (~36%) and K giants (~21%), consistent with key K2 science programs tosearch for transiting exoplanets and galactic archeology studies usingoscillating red giants. However, we find a significant variation of thefraction of cool dwarfs with galactic latitude, indicating a target selectionbias due to interstellar reddening and the increased contamination by giantstars near the galactic plane. We discuss possible systematic errors in thederived stellar properties, and differences to published classifications for K2exoplanet host stars. The EPIC is hosted at the Mikulski Archive for SpaceTelescopes (MAST): http://archive.stsci.edu/k2/epic/search.php.

The K2 Ecliptic Plane Input Catalog (EPIC) and Stellar Classifications of 138,600 Targets in Campaigns 1-8