Frequency analysis of the BRITE 2016/17 data in the red (left) and the blue filter (right). Spectral window (panels a and e), original amplitude spectrum from 0 to 100 d⁻¹ (panels b and f), zoom into the original amplitude spectrum (panels c and g), and residual amplitude spectrum after prewhitening the corresponding pulsation frequencies (panels d and h) with the residual noise level marked as horizontal dashed lines. The identified pulsation frequencies (as listed in Table 2) are marked in panels b and c as red (for the BRITE red filter) and in panels f and g as blue (for the BRITE blue filter) lines. The triangles mark the frequencies found in the ASTEP data by Mékarnia et al. (2017). Vertical dashed lines mark the positions of the respective satellite’s orbital frequency (i.e., BTr on the left and BLb on the right) and its multiples.