Abstract
New BVRI light curves of the W UMa type eclipsing binary of multiple system 1SWASP J093010.78+533859.5 (GSC 0380-00759) have been constructed based on CCD observations obtained using 1.88 m reflector telescope of KAO, (Kottamia Astronomical Observatory), Egypt on March, 20(th) in 2013. New times of minima and new ephemeris have been determined from these light curves. Using the Binary Maker 3.0 (BM3) and PHOEBE program, the geometric and photometric element parameters of this system have been derived. Light curve analysis results indicate that J093010B is an overcontact binary with third body shared with 0.056 +/- 0.006 of its total luminosity. The filling factor of the system is approximately equal to 17%. According to all available eclipse timings, the preliminary rate of period change has been determined to be -6.35 x 10(-5) day/yr. The semi-major axis has been determined as 1.6 +/- 0.1 R .