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K2 is the mission concept for a repurposed Kepler mission that uses tworeaction wheels to maintain the satellite attitude and provide ~85 days ofcoverage for ten 105-deg^2 fields along the ecliptic in the first 2.5 years ofoperation. We examine stellar populations based on the improved Besancon modelof the Galaxy, comment on the general properties for the entire ecliptic plane,and provide stellar occurrence rates in the first 6 tentative K2 campaignsgrouped by spectral type and luminosity class. For each campaign we distinguishbetween main sequence stars and giants and provide their density profile as afunction of galactic latitude. We introduce the crowding metric that serves foroptimized target selection across the campaigns. For all main sequence stars wecompute the expected planetary occurrence rates for three planet sizes: 2-4REarth, 4-8 REarth, and 8-32 REarth with orbital periods up to 50 days. Inconjunction with Gaia and the upcoming TESS and Plato missions, K2 will becomea gold mine for stellar and planetary astrophysics.

Stellar statistics along the ecliptic and the impact on the K2 mission concept