Absolute magnitude within a 4 × 104 km radius projected photometry aperture as a function of time, expressed as Day of Year. The red curve is a best-fit in which the cross-section varies as ﹩{C}_{e}\propto {r}_{H}^{-4.9\pm 0.4}﹩, to guide the eye. The date of perihelion is indicated by the dashed vertical line.