KOI-1786 is an eclipsing binary system discovered by Kepler which
consists of a red giant star primary and an M-dwarf companion in a 24.68 day
eccentric orbit. We present the analysis of the star spot crossing features
present in four years of transit light curves. Our results show a very active
red giant primary despite its slow rotation period of approximately 66 days [20].
This level of activity in a binary with a highly active evolved companion is
consistent with a long period RSCVn type system [22]. We find multiple spots features
in every transit, as well as two distinct features which must be darker than typical
sunspot umbras, indicating the presence of several large spots with a contrast of
approximately 0.05 on the surface of the giant primary.
