Credit: ESA / DLR / FU Berlin (G. Neukum)
Earlier this week, we compared Mariner crater as it had been photographed by three separate spacecraft. Today, I thought I'd compare the Olympus Mons caldera. Yesterday, I highlighted a photograph taken by Mariner 9 in 1972 of the caldera. Today's picture was taken by Mars Express on January 21, 2004. This is the first high-resolution color image of the complete caldera of Olympus Mons. The image was taken from a height of 273 km in orbit 37 by Mars Express's High Resolution Stereo Camera (HRSC). The view is centred at 18.3° North and 227° East. The image is about 102 km across with a resolution of 12 m per pixel, South is up (i.e., the image is upside down compared to yesterday's image).