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Mars Pathfinder
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Sol 4 (7 July 1997) Images

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These are the tracks created by the Sojurner Rover as it maneuvered toward "Barnacle Bill". This rock was the first examined by the Alpha Proton X-Ray Spectrometer. This image shows the Sojurner Rover conducting its examination of "Barnacle Bill" with the APXS. The images was taken by the fully deployed (1.8 meters) IMP camera. This is one of the first images taken by one of the three forward-facing rover cameras. It shows the partially deflated airbags and, in the upper right corner, the high gain antenna. In this image is the rectangular rock dubbed "Flat Top" by Pathfinder scientists. The surface of this rock appears to be covered by dust.

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The two hills in the distance, approximately one to two kilometers away, have been dubbed the "Twin Peaks" and are of great interest to Pathfinder scientists as objects of future study. The white areas on the left hill, called the "Ski Run" by scientists, may have been formed by hydrologic processes. Sojourner is visible in this image, one of the first taken by the deployed Imager for Mars Pathfinder (IMP) on Sol 3. The rover has moved from this position into one that later facilitated its using the Alpha Proton X-Ray Spectrometer (APXS) instrument on Barnacle Bill. The APXS, located at the rear of the rover, is not visible in this image. Yogi, a rock taller than rover Sojourner, is the subject of this image, taken by the deployed Imager for Mars Pathfinder (IMP) on Sol 3. The soil in the foreground will be the location of multiple soil mechanics experiments performed by Sojourner's cleated wheels. Pathfinder scientists will be able to control the force inflicted on the soil beneath the rover's wheels, giving them insight into the soil's mechanical properties. This new view of the rock dubbed "Couch" was taken by the deployed Imager for Mars Pathfinder (IMP) on Sol 3. Earlier images, taken by the undeployed IMP, hinted that Couch was balanced upon the rectangular rock approximately three-quarters of the way up from the bottom of the image. The deployed IMP, standing 1.8 meters above the Martian surface, has now revealed Couch to be a free-standing object positioned at the Martian horizon.

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Portions of Sojourner's Alpha Proton X-Ray Spectrometer (APXS), a deployment spring, and the rock Barnacle Bill are visible in this color image. The image was taken by Sojourner's rear camera, and shows that the APXS made good contact with Barnacle Bill.