A type of asteroid, fairly common in the outer main asteroid belt, with a distribution that peaks at a mean distance from the Sun of 4.0 au. Asteroids of this type have a featureless reflectance spectrum, flat to slightly reddish over the wavelength range 0.3–1.1 μ‎m. Their spectra are intermediate between types C and D. P-type asteroids are distinguished from the spectrally identical E and M types by their lower albedos (0.02–0.06). Examples include (87) Sylvia, diameter 253 km, and (153) Hilda, diameter 171 km.