SIMBAD references

SDSS J092122.84+203857.1 is a polar-type cataclysmic variable system, consisting of a strongly magnetized white dwarf that accretes from its red dwarf companion. It is also one of just five polars known to have been observed by Kepler during its K2 mission. We analyzed the K2 short-cadence light curve of J0921 and identified a weak, but highly coherent, signal at a frequency of 17.099 cycles day^–1, corresponding with the system's reported orbital period. We see no overall variation in the accretion rate across the K2 observation, and both our measurement of the period and the binned orbital profile are very consistent with previous ground-based data.