Launched in 2009, the Kepler Mission is surveying a region of our galaxy to determine what fraction of stars in our galaxy have planets and measure the size distribution of those exoplanets. Although Kepler completed its primary mission to determine the fraction of stars that have planets in 2013, it is continuing the search, using a more limited survey mode, under the new name K2.

The K2 Ecliptic Plane Input Catalog is the primary source of information about objects observed as potential targets for the K2 mission, as the Kepler Input Catalog was used for the original Kepler mission.