Uranus satellites: surface properties

摘要: The post-Voyager knowledge of the photometric, colorimetric, spectral, and thermal properties Uranian satellites is reviewed, focusing on such fundamental physical as albedo, color, surface texture. While albedo variations at least a factor 2 exist, color differences are almost absent (Miranda) or subdued (Oberon). In case Titania, strong opposition effect reported by ground-based observers was confirmed Voyager. Voyager did not observe parts phase curves other satellites. observations Ariel Miranda suggest that both have highly porous regoliths, thermophysically similar to those Jupiter's icy At time flyby (south pole facing sun), maximum temperatures reached exceeded 85 K, but nighttime polar predicted drop 20 30 K because each spends about 40 yr in darkness. Ground-based spectroscopy identified water ice an important constituent.