Azimuthally averaged surface brightness profiles of 252P from the (a) LSGT (R band) and IRSF (H band; StokesI) data. All brightness points are normalized to the radial distance of 1.25′′. The black solid and dashed lines denote the gradients of m = −1 and m = −1.5, respectively, which are typical of cometary dust steadily expanding with initial ejection velocity under the solar radiation field (Jewitt & Meech 1987). 2 × 2 binned H-band images are shown, each of which are from (b) before and (c) after the first activation of 252P taken from IRSF. Brightness was normalized between 0 and 1. North is up, and east is to the left. The bottom solid lines scale with 15′′, and the dashed and solid arrows denote the antisolar (−r_⊙) and negativevelocity (−v) vectors, respectively. Central stars mark the position of the nucleus.