The figure represents observations of GO Cyg in August - October 2010. GO Cyg is a semi- detached EB.  It's period is 0.72 days. It's primary eclipse has a depth of 0.6m and the secondary eclipse 0.2m. Each point on the figure represents the analysis of  ten images obtained through DSLR photometry.   The settings for the images with a 200 mm lens were exposure 4 seconds, ISO 800, f 2. Measurements of the system are continuing to get a more precise current period.   The phase diagram is based on the latest Krakow period of 0.71776475 days.


Des Loughney