The data consisted of 360 exposures at intervals of just under a minute, covering about 4 and 3/4 hours of time, in white light.   The plot of individual data points is a bit noisier than I would have liked, so Iíve taken three-point moving averages and graphed those as shown. 

Telescope: 20cm SCT (Celestron CPC800, on HD equatorial wedge, with f 6.3 reducer)

Camera: SBIG ST8XME

Location: Horsham, West Sussex UK

Alan Smith.