Coordinates of Features on the Galilean Satellites,

One product of the current exploration of the solar system is the publication of maps of those bodies with solid surfaces. These maps show the relative positions of topographic features, one-to-another, and are used as bases for correlating a variety of measurements and pictorial data and for regional geologic mapping. In order to produce a map of a planetary surface, it is necessary to first establish a coordinate system for the body and then to determine the latitudes and longitudes of topographic features in this coordinate system. It is the purpose of this paper to define the coordinate systems of each of the Galilean satellites and to present coordinates of features seen in the Voyager pictures of these satellites. The two Voyager encounters with Jupiter are described in Smith et al. 1979a,b. A preliminary report on the progress of the control nets of the Galilean satellites was published by Davies et al. 1979. Author