Comparison of P_r(α) profiles of QY1, Don Quixote, and Hidalgo with asteroids and a bare comet nucleus, 209P/LINEAR, (Kuroda et al. 2015). Each letter (C, B, and S) indicates the taxonomic types. The P_r value of Hidalgo in Fornasier et al. (2006) is plotted as the triangle marker. We plot the diagnostic line (dash-dotted line) corresponding to p_V = 0.1. Objects withp_V ≤ 0.1 are be located on the upper side of the line and vice versa.