I'm pleased to report my observation on 2006 Sep 16 UT, of a complete TrES-2 transit from my backyard observatory in Tennessee. The light curve above was acquired with an R band filter, and each red dot in the curve is the average value of 10 successive observations (binned). The horizontal error bars show the standard deviation (about 3 millimag on average). Exposure time was 40seconds. A detailed description of my observatory instrumentation can be found here.

The ingress and egress are very evident in the light curve, and occur at the predicted times. The transit depth was ~0.0165 mag, which corresponds well with the value published in the discovery paper TrES-2: The First Transiting Planet in the Kepler Field, by O'Donovan, et al. My observatory was operated automously under control of Astronomer's Control Panel version 4.2. Although my CCD camera is capable of self guided operation I chose to let ACP plate solve each image comparing field stars with those from the HST guide star catalog. This performs astrometric reduction that is then used to determine the center of the field of view of each image as it is downloaded and automatically calibrated. If the resulting astrometric solution shows drift to be > 0.1' ( 6 arc-secs) ACP gently nudges the scope back into position. My Astrophysics 1200 mount has very low periodic gear error ( < 3arc-secs peak-peak uncorrected) so this technique works extremely well and yields excellent results. Stellar drift is typically in the range of .01-.02'/min so stellar centroids move around less than a stellar width over the course of the observing run. AIP4Win v. 2 was used to perform aperture differential photometry and a 5 star ensemble was used for the comparison.