Temporal evolution in the postperihelion absolute magnitudes of 252P from the multiband OAO data. m_X denotes the absolute magnitude in X band, with an aperture size of 1000 km (corresponding to 33.6′′ –2.5′′) in radius. Differences in m_X between two bands are shown as blue (m_g’ − ) and orange ( − ) circles. All the error bars include the 1σ errors on the measurements, calibration of the field stars with the assumed internal catalog error of ~0.1, and propagated errors in magnitude subtraction of two bands.