Voyager feature-fixed photometry of Iapetus

Details Voyager feature-fixed photometry of Iapetus Voyager feature-fixed photometry of Iapetus

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pggp.rept...26g&link_type=abstract

In NASA. Washington Repts. of Planetary Geol. Program p 26 (SEE N84-23431 13-91)

Physics

Iapetus, Ice, Photometers, Surface Properties, Voyager Project, Albedo, Boundaries, Brightness Distribution, Color, High Resolution, Icy Satellites, Image Processing, Orbits, Symmetry

Scientific paper

Iapetus is one of the most mysterious objects in the Solar System. As indicated by previous ground-based studies and dramatically confirmed by the Voyager images, the surface of this satellite has a strikingly bimodal distribution of albedo and color. While the underlying object seems to be a largely icy satellite similar to Rhea, the leading hemisphere of Iapetus is dominated by a very dark patch of hemispheric scale. The symmetry of this dark material with respect to the orbital motion of the satellite strongly suggests an external control, if not necessarily an external origin, for the dark material. Quantitative photometric techniques are used to map the photometric function of the surface of the material over Iapetus. The approach is to study clearly defined surface areas that appear on a number of Voyager images obtained under different spacecraft and lighting geometries.

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