Abstract
Photoelectric photometry of the rapidly oscillating Ap (roAp) star HD 217522 was obtained at Cerro-Tololo Inter-American Observatory, European Southern Observatory (ESO), Perth Observatory and South African Astronomical Observatory in 1989. The results of a frequency analysis of these data, all of which were obtained in Johnson B except for the ESO data, which are Stromgren uvby, are presented. The analysis reveals a significant shift of the primary oscillation frequency from ν 1 in 1982 to ν 1 in 1989. This frequency change is attributed to a change of pulsation mode
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