This Imager for Mars Pathfinder (IMP) image shows the Sojourner latch spring before (left image) and after (right image) deployment. This is how visual confirmation was made that at least one side of the rover had stood up and locked in place as planned.

Photojournal note: Sojourner spent 83 days of a planned seven-day mission exploring the Martian terrain, acquiring images, and taking chemical, atmospheric and other measurements. The final data transmission received from Pathfinder was at 10:23 UTC on September 27, 1997. Although mission managers tried to restore full communications during the following five months, the successful mission was terminated on March 10, 1998.