Image series taken during 2002-03-05/06 night. The peak before 0.4 is due to the occulation/transit of GSC 2508 1388. The comparison star is GSC 2508 1374. The red diamons represents 180 sec exposures and the green crosses of the 120 second exposures. The period is a little bit more than 0.2 day, eg. about 5 hours.