The control network of Iapetus

Mathematics – Logic

Scientific paper

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Iapetus, Planetary Mapping, Planetary Surfaces, Voyager 1 Spacecraft, Voyager 2 Spacecraft, Saturn, Satellites, Iapetus, Photogrammetry, Observations, Voyager 1, Voyager 2, Procedure, Techniques, Surface, Almeric, Obliquity, Radius, Physical Properties, Coordinate System, Data, Analysis, Parameters, Calculations, Craters, Maps, Cartography, Rotation

Scientific paper

A control network of the Saturnian satellite Iapetus has been established photogrammetrically from pictures taken by the two Voyager spacecraft. Coordinates of 62 control points have been computed and listed; pixel measurements of these points were made on 14 Voyager 1 and 66 Voyager 2 pictures. Some of these points are identified on the preliminary U.S. Geological Survey map of Iapetus and many are identified by name. The Voyager 1 and Voyager 2 pictures covered limited regions of the satellite's surface and contained no overlapping areas. The longitude system on Iapetus is defined by the crater Almeric; the 276 deg meridian passes through the center of this crater. The obliquity of Iapetus has been measured as 0.4 deg + or - 1.6 deg. The mean radius of Iapetus has been determined at 718 + or - 8 km.

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