OFFICE OF PUBLIC INFORMATION
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
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PHOTO CAPTION                                      Voyager 1-81
                                                   P-21209C
                                                   March 5, 1979
 
This view of Io was taken on March 4 at 7:00 PM from a range of
862,200 kilometers (500,000 miles) by Voyager 1. It shows
subspacecraft longitude of approximately 146 degrees. Circular
features are seen that may be meteorite impact craters or features
of internal origin. Irregular depressions are seen that indicate
surface modification has taken place. The bright irregular patches
appear to be younger deposits masking the surface detail. JPL
manages and controls the Voyager project for NASA's Office of
Space Science.