SIMBAD references

New V -band CCD observations of variable star V2455 Cyg were performed during two nights in September 2017. According to all times of maximum light and new maxima, the O-C curve was analyzed. The period changes of V2455 Cyg were investigated and the rate of increasing period was obtained to be (1/P) dP/dt = 1.99 x 10^–7 yr^–1. Frequency analysis indicated that V2455 Cyg pulsates with the radial p mode and the fundamental frequency is 10.61574 d^–1. Physical parameters of V2455 Cyg at mean temperature were determined (e.g., R = 2.52 R_☉ and M = 1.92 M_☉). The position of this star in the H-R diagram confirms that V2455 Cyg is a high amplitude δ Scuti star.