Flight Dynamics data from THEMIS-B (one of the two ARTEMIS spacecraft) indicated that one of the EFIspherical tip masses may have been struck by a meteoroid oct. 14 at 0605 UT

All science instruments continue to collect data and probe and science instruments aboard the spacecraft continue to operate nominally. The upcoming insertion into the so-called Lissajous orbit will not be interrupted.

EFI (electric field instrument) is two instruments that measure magnetic fields

ARTEMIS stands for “Acceleration, Reconnection, Turbulence and Electrodynamics of the Moon’s Interaction with the Sun”. The ARTEMIS mission uses two of the five in-orbit spacecraft from another NASA Heliophysics constellation of satellites (THEMIS) that were launchedin 2007 and successfully completed their mission earlier in 2010. The ARTEMIS mission allowed NASA to repurpose two in-orbit spacecraft to extend their useful science mission. ARTEMIS will use simultaneous measurements of particles and electric and magnetic fields from two locations to provide the first three-dimensional perspective of how energetic particle acceleration occurs near the Moon's orbit, in the distant magnetosphere, and in the solar wind.

Source: NASA/JPL