Centaur B – R colors and absolute visual magnitude, H_V. The horizontal lines represent the median H_V values of the gray and red Centaurs. Application of the Wilcoxon rank sum test gives p = 0.07 which shows an almost significant difference between H_V values of red and gray Centaurs. The red Centaurs have larger albedos than the gray Centaurs and so the possibly larger median H_V for red Centaurs suggests that red Centaurs may have smaller diameters than gray Centaurs.