Rotation Period of 227 Philosophia is Re-evaluated

We previously published a rotation period of 52.98 hours for 227 Philosophia (Pilcher and Alkema, 2014, Minor Planet Bulletin 41, 188). By adjusting instrumental magnitudes of the observations reported there by 0.03 or less, we obtain equally good fits to 26.476 hours with a monomodal lightcurve and 52.955 hours with a bimodal lightcurve, amplitude 0.12 magnitudes. We prefer the shorter period because the two sides of the longer period lightcurve are nearly identical.