Abstract
V523 Cassiopeiae (V523 Cas) is a W UMa type of the eclipsing binary system which its orbital period is 0.23369 days. This study using a 0.5-meter telescope with CCD photometric system in V and R filters was conducted at the Regional Observatory for the Public, Chachoengsao, Thailand during 20 – 21 December 2018, UT. The obtained data were calculated using photometry method to construct the light curve of each wavelength bands and to determine the time of minimum. Consequently this study obtained the time of minimum of V523 Cas that HJD2458472.996 and HJD2458473.111, respectively. These values were used to compute the O-C curve and period change. The results show that the period of the V523 Cas is increasing which the rate of 5.59 × 10−3 second/year. Furthermore, the V523 Cas might be the third body in its system which far from the center of mass about 6.04 AU the orbital period is 91.3 years.
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