Top panel displays the historical LC of AX Per from  ~1890 (see Fig. 1 of Skopal et al. 2001,and references therein). We used visual magnitude estimates from the AAVSO International Database and those gathered by members of the AFOEV, which are available on CDS. Visual data were smoothed within 20-day bins. Bottom panel shows the UBV LCs of AX Per from its last 1988 major outburst. Minima timing corresponds to the ephemeris given by Eq. (1).