Normalized spectral reflectivity of 2012 DR₃₀ in the optical (red curve), in comparison with the main TNO taxonomy classes BB,BR,RI, and RR (dashed-dotted lines from bottom to top, Perna et al. 2010), and the TNOs Eris (purple curve Alvarez-Candal et al. 2011) and Makemake (dark blue curve Brown et al. 2007). In addition, the average reflectivities of the S- and V-type asteroids are also shown (green and orange curves, respectively, Chapman et al. 1993; Gaffey et al. 1993). Note the Z-band feature of 2012 DR₃₀ is unseen in the usual TNO taxonomy classes and could most readily be attributed to the presence of a reddened olivine-bearing surface (see the text for details).