Top-left panel: V-band magnitude timeseries of WW Psa versus heliocentric Julian day collected at Siding Spring Observatory and CASLEO. Top-middle panel: Lomb-Scargle periodogram (solid line). The power peak corresponding to the rotation period P = 2.37 d is marked with a small red line above it. The dotted red line indicates the window spectral function, whereas the horizontal dashed line represents the power level corresponding to a FAP = 0.01. Top-right panel: clean periodogram. Bottom panel: light curve phased with the rotation period. Red bullets are data from CASLEO. The uncertainty associated with each point is smaller than the symbol size.