The reflectivity spectrum and opposition effect of Titan's surface observed by Huygens' DISR spectrometers

► Huygens-DISR measured Titan's surface reflectivity using the Surface Science Lamp. ► The phase curve between 0.02° and 80° phase angle suggests a strong opposition surge. ► The reflectivity spectrum is smooth, peaking at 0.45 at 750 nm wavelength, 0° phase. ► The probed terrain within 100 m of the landing site is very homogeneous. ► The methane mixing ratio of the atmosphere near the surface is 5.0±0.3%.