UV Psc is a typical RS CVn type system undergoing dynamic chromosphere activity. We performed photometric observations of the system in 2015 and secured new BVR light curves showing well-defined photometric waves. In this paper, we analyzed the light curves using Wilson-Devinney binary code and investigated the orbital period of the system. The combination of our light curve synthesis with the spectroscopic solution developed by previous investigators yielded the absolute parameters as: M1 = 1.104 ± 0.042 Mⵙ, R1 = 1.165 ± 0.025 Rⵙ, and L1 = 1.361 ± 0.041 Lⵙ for the primary star, and M2 = 0.809 ± 0.082 Mⵙ, R2 = 0.858 ± 0.018 Rⵙ, and L2 = 0.339 ± 0.010 Lⵙ for the secondary star. The eclipse timing diagram for accurate CCD and photoelectric timings showed that the orbital period may vary either in a downward parabolic manner or a quasi-sinusoidal pattern. If the latter is adopted as a probable pattern for the period change, a more plausible account for the cyclic variation may be the light time effect caused by a circumbinary object rather than an Applegate-mechanism occurring via variable surface magnetic field strengths.

1. INTRODUCTION
 2. NEW OBSERVATIONS
 3. LIGHT CURVE SYNTHESIS
  3.1 New Light Curves of UV Psc
  3.2 Binary Modeling and Absolute Dimensions
 4. ORBITAL PERIOD VARIATION INVESTIGATION
 5. SUMMARY AND CONCLUSION
 REFERENCES

• Min-Ji Jeong(Department of Astronomy and Space Science, Chungbuk National University)
• Wonyong Han(Korea Astronomy and Space Science Institute/Department of Astronomy and Space Science, University of Science and Technology Korea) Corresponding Author
• Chun-Hwey Kim(Department of Astronomy and Space Science, Chungbuk National University/Chungbuk National University Observatory)
• Joh-Na Yoon(Department of Astronomy and Space Science, University of Science and Technology Korea/Chungbuk National University Observatory)
• Hyoun-Woo Kim(Department of Astronomy and Space Science, Chungbuk National University/Korea Astronomy and Space Science Institute)