I got one "all-night" clear night in
February 2005 (27/28th), and spent 11.1 hours of CCD
photometry on HS 0726+6738, an SW Sex-type CV. The
session resulted in >430 useful CCD
observations, otbtained through a clear filter,
using a 0.35-m f/6.3 telescope at CBA Belgium
The resulting light curve is shown below and is
quite interesting. It shows 4 successive eclipses
(!) each 2.5 mags deep. Superimposed is a beautiful
superhump, and some irregular activity.
Using the Kwee-van Woerden method in Peranso,
I measured the mid-eclipse timings of the above 4
eclipses, and I find an average orbital period of
3.2114 +/-0.0034 h. The literature value for
this SW Sex star is 3.21h [see P. Rodríguez-Gil et
al, A&A 424, 647-655 (2004)].