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We present ground-based optical observations of the September 2009 andJanuary 2010 transits of HD 80606b. Based on 3 partial light curves of theSeptember 2009 event, we derive a midtransit time of T_c [HJD] = 2455099.196 +-0.026, which is about 1 sigma away from the previously predicted time. Weobserved the January 2010 event from 9 different locations, with most phases ofthe transit being observed by at least 3 different teams. We determine amidtransit time of T_c [HJD] = 2455210.6502 +- 0.0064, which is within 1.3sigma of the time derived from a Spitzer observation of the same event.

Ground-based multisite observations of two transits of HD 80606b