We present synoptic optical photometry of HD 189733 , the chromospherically active parent star of one of the most intensively studied exoplanets .
We have significantly extended the timespan of our previously reported observations and refined the estimate of the stellar rotation period by more than an order of magnitude : P = 11.953 \pm 0.009 days .
We derive a lower limit on the inclination of the stellar rotation axis of 56 \arcdeg ( with 95 % confidence ) , corroborating earlier evidence that the stellar spin axis and planetary orbital axis are well aligned .