(2) The darkest material is to Stickney's west, correlating with material having an intermediate visible/NIR ratio (Murchieet al.'s “bluish gray” unit). Globally, there are three albedo classes, reasonably separated geographically: (1) Bright material is to the east and south of Stickney, corresponding approximately to the locations on Phobos having the highest, “bluest” visible/near-IR ratio (Murchieet al. Photometrically corrected images were mosaicked into an albedo map most of the resulting normal reflectances are in the range 0.06-0.10, and the brightest region on Phobos is the northeast rim of the crater Stickney, the portion of that rim with the highest concentration of grooves. A global-average Hapke function derived from disk-resolved data confirms previous indications that Phobos has a strong opposition surge. Indicative of mean densities of about 300 kg m‑3.Ĭlear-filter Viking images, and an accurate numerical model of the shape of Phobos, have been used to determine this satellite's photometric properties. Small satellites embedded in ring arcs are distinctively smoothĮllipsoids that are unique among small, well-observed Solar Systemīodies and are probably relaxed, effectively fluid equilibrium shapes Satellites) have deep covering of debris subject to downslope transport. Satellites occupying libration zones (Trojan The co-orbitals Janus and Epimetheus are the most lunar-like Shepherding satellites show structural forms and heavily cratered Satellites within the main rings display equatorial ridges. Objects inĭifferent dynamical niches have different surface morphologies. Where some generalizations on surface morphology may be made. The Cassini mission has graduallyĪccumulated image and spectral coverage of these objects to the point More than a dozen small (<150 km mean radius) satellites occupyĭistinct dynamical positions extending from within Saturn's classical
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