μm. This result suggests that the principal cause of the lunar opposition surge is shadow-hiding rather than coherent backscatter. See also Albedo Bidirectional reflectance function Brocken spectre, the apparently enormous and magnified shadow of an observer cast upon the upper surfaces of clouds opposite the Sun Gegenschein Geometric albedo References External links Hayabusa observes the opposition surge of Asteroid Itokawa opposition effect, "Atmospheric optics" website. Includes a picture of the opposition surge on the moon opposition effect mechanism, "Atmospheric optics" website. Diagrammatic representation of the opposition surge "The-moon wikispaces" opposition surge page Opposition surge on Saturn's B Ring as seen by Cassini–Huygens Astronomical events Lunar science Optical phenomena Observational astronomy Radiometry Scattering, absorption and radiative transfer (optics)