[meteorite-list] MRO HiRISE Images: February 22, 2012

[Ron Baalke]

MARS RECONNAISSANCE ORBITER HIRISE IMAGES
February 22, 2012

o Well-Speckled Polar Dunes	
  http://hirise.lpl.arizona.edu/ESP_025579_2580

  In this image, taken during the northern spring season, the 
  dunes and ground are still covered in seasonal frost.

o Utopia Planitia Scallops, Polygons, and Boulders	
  http://hirise.lpl.arizona.edu/ESP_025620_2275

  This terrain is covered by pits and scallops (pits open on 
  one side), perhaps due to collapse after sublimation of 
  subsurface ice.

o Dunes in Late Fall: Frost in the Ripples	
  http://hirise.lpl.arizona.edu/ESP_025679_1300

  These dunes in Aonia Terra are being monitored for changes such 
  as gullies, which form over the winter from the action of carbon 
  dioxide frost.

o Imaging in Deep Shadows	
  http://hirise.lpl.arizona.edu/ESP_025680_1350

  This image of an impact crater was acquired when the sun was  
  just 11 degrees above the horizon, so a long shadow extends over 
  most of the crater interior.

All of the HiRISE images are archived here:

http://hirise.lpl.arizona.edu/

Information about the Mars Reconnaissance Orbiter is 
online at http://www.nasa.gov/mro. The mission is 
managed by NASA's Jet Propulsion Laboratory, a division 
of the California Institute of Technology, for the NASA 
Science Mission Directorate, Washington, D.C. Lockheed 
Martin Space Systems, of Denver, is the prime contractor 
and built the spacecraft. HiRISE is operated by the 
University of Arizona. Ball Aerospace and Technologies 
Corp., of Boulder, Colo., built the HiRISE instrument.