  We present photometry of the intermediate polar FO Aquarii obtained as part
of the K2 mission using the Kepler space telescope. The amplitude spectrum of
the data confirms the orbital period of 4.8508(4) h, and the shape of the light
curve is consistent with the outer edge of the accretion disk being eclipsed
when folded on this period. The average flux of FO Aquarii changed during the
observations, suggesting a change in the mass accretion rate. There is no
evidence in the amplitude spectrum of a longer period that would suggest disk
precession. The amplitude spectrum also shows the white dwarf spin period of
1254.3401(4) s, the beat period of 1351.329(2) s, and 31 other spin and orbital
harmonics. The detected period is longer than the last reported period of
1254.284(16) s, suggesting that FO Aqr is now spinning down, and has a positive
$\dot{P}$. There is no detectable variation in the spin period over the course
of the K2 observations, but the phase of the spin cycle is correlated with the
system brightness. We also find the amplitude of the beat signal is correlated
with the system brightness.

Solar and Stellar Astrophysics