Emily LakdawallaJan 04, 2011

Two views of Santa Maria, from orbit and from the ground

Mars Reconnaissance Orbiter has just snapped another photo of Opportunity sitting on the ground on Mars. These pictures never get old. This one shows Opportunity at the rim of Santa Maria crater; it was taken on December 31, 2010 (sol 2466).

Aerial view of Opportunity at Santa Maria
Aerial view of Opportunity at Santa Maria The HiRISE camera on Mars Reconnaissance Orbiter acquired this view of Opportunity sitting at the edge of the 100-meter-diameter crater Santa Maria on 31 December 2010, or sol 2466 of the rover's mission.Image: NASA / JPL-Caltech / University of Arizona

If you enlarge the image and zoom in you can actually see the shape of the rover's shadow including the mast on which the cameras are mounted, which is just incredible, considering that those things are skinnier than the size of a HiRISE pixel.

Whenever I see a HiRISE photo of Opportunity, I always want to know what the view from the ground looked like at the same time. So here you go: this was taken two days earlier, but shows Opportunity and her shadow in the same positions they occupied when the HiRISE photo was taken two days later.

Hazcam view of Santa Maria crater, sol 2464
Hazcam view of Santa Maria crater, sol 2464 Opportunity took this Hazcam view of Santa Maria crater at the end of her drive on sol 2464 (29 December 2010). The view has been processed to reduce the effects of dust and of the fish-eye distortion of the camera optics.Image: NASA / JPL-Caltech / processed by Emily Lakdawalla

Just think about that -- we have incredibly detailed views from the sky and from the ground at the same time. In fact, I haven't done the math, but I'll bet you that the HiRISE photo gets better resolution on the east side of the crater than Opportunity's images do. Mars Reconnaissance Orbiter is really living up to its name; its photos and spectral maps (using its CRISM instrument) have identified a spot on the southeast edge of the crater as being particularly interesting mineralogically, giving the Mars Exploration Rover mission key information that will help them make the most of their time on Mars. Rather than stay in this position Opportunity has rolled on to check out those rocks -- which may contain hydrated sulfate minerals, and more records of past water on Mars -- over the coming solar conjunction.

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