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We use high accuracy photometric data obtained with the Kepler satellite tomonitor the activity modulations of the Kepler-210 planet host star over a timespan of more than four years. Following the phenomenology of the star's lightcurve in combination with a five spot model, we identify six differentso-called spot seasons. A characteristic, which is common in the majority ofthe seasons, is the persistent appearance of spots in a specific range oflongitudes on the stellar surface. The most prominent period of the observedactivity modulations is different for each season and appears to evolvefollowing a specific pattern, resembling the changes in the sunspot periodsduring the solar magnetic cycle. Under the hypothesis that the star exhibitssolar-like differential rotation, we suggest differential rotation values ofKepler-210 that are similar to or smaller than that of the Sun. Finally, weestimate spot life times between 60 days and 90 days, taking into considerationthe evolution of the total covered stellar surface computed from our model.

Glimpses of stellar surfaces. I. Spot evolution and differential rotation of the planet host star Kepler-210