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 .