Surface Stereo Imager on Mars, Side View - Sol 116 (MULTISPECTRUM; credits: Lunexit)

Caption NASA:"This image is a view of NASA's Phoenix Mars Lander's Surface Stereo Imager (SSI) as seen by the Lander's Robotic Arm Camera.
This image was taken on the afternoon of the 116th Martian Day, or Sol, of the Mission (September 22, 2008).
The mast-mounted SSI, which provided the images used in the 360° panoramic view of Phoenix's Landing Site, is about 4" tall and 8" long".