US-MARS

This set of 12 images was obtained during the period of Mars Orbiter Camera (MOC) focus tests and calibrations that were executed in the first week of March, 1999. Each picture was taken near15.6&#176.N latitude, which at this time was the sub-Earth point-the latitude at which Earth would be seen directly overhead if viewed from the ground. These pictures were obtained to provide a direct link between simultaneous Earth-and space-based telescope observations and the MOC. Each picture is shown at the full commanded resolution of 12 meters (39 feet) per pixel, and each covers an area 3 by 3 kilometers (1.9 miles) in size with illumination from the upper left. Typically, images that will be obtained by MOC during the Mapping Phase of the Mars Global Surveyor mission will have resolutions of 1.5 meters (5 feet) per pixel--a factor of 8 improvement over the pictures shown here. AFP PHOTO /NASA (Photo by NASA / AFP) (Photo by NASA/AFP via Getty Images)