ARTEMIS - an extension of the NASA Medium Explorer mission THEMIS - is a two-spacecraft mission that completed a two-year lunar transfer by way of multiple lunar gravity assists and a low-energy trans-lunar trajectory that culminated into EM L_1 and EM L_2 lunar libration point orbits and finally stable prograde and retrograde elliptical lunar orbits in July 2011. Between the two spacecraft 170 maneuvers events were executed from the start of the mission extension to the final lunar placement with a 100% successful execution rate. This paper addresses the ARTEMIS mission's operational challenges and lessons learned during the low-energy Trans-Lunar phase, the Earth-Moon Libration Orbit phase, and Lunar Orbit phase.
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