UBVR observations of the symbiotic star ZZ CMi

This study is based on photometric observations of ZZ CMi during the last observational season (2024/2025). Other than looking for flickering we were interested in following the variability of brightness in the same period. In the presented multicolor photometry, we find variability throughout each night — pronounced flickering in the U band. The amplitude of the flickering is about 0.22−0.48 mag in the U band. In the B band, the variability is lower, with an amplitude ≤0.05 mag. The work shows multiple convenient standard stars around the symbiotic star ZZ CMi.