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Ball Aerospace & Technologies Corp. (Boulder, Colo.)
University of Arizona (Tucson)
Lockheed Martin Space Systems (Bethesda, Md.)
Lightworks Optics, Inc. (Tustin, Calif.)
ATK Space Systems (Edina, Minn.)
E2V Ltd. (Chelmsford, U.K.)
Research Electro-Optics, Inc. (Boulder, Colo.)
In sending the Mars Reconnaissance Orbiter to the Red Planet, scientists intended to produce images at resolutions never before seen in planetary exploration missions. To do so, they needed the largest telescope ever built for any deep space mission. To that end, Ball Aerospace & Technologies Corp. designed and built HiRISE, the 0.5 meter reflecting telescope for the University of Arizona. One of the most versatile instruments aboard MRO, it was designed to take color, stereo pictures of swaths of the surface up to 6 km wide, with an ability to resolve objects as small as one meter (about 3 feet) across from 300 km above the surface while orbiting Mars at a speed of 3.4 kilometers per second.
From the beginning, HiRISE was designed to be a high resolution camera. It consists of a 12-meter focal length three-mirror telescope, as well as a large charged coupled device (CCD) detector assembly. Because of this, it achieves a pixel field-of-view of 1 microradian, or 0.3 meter/pixel at a height of 300 km. It can image in three color bands, 400-600 nm (blue-green or B-G), 550-850 nm (red) and 800-1,000 nm (near infrared or NIR). Red color images are up to 20,264 pixels wide (6 km in a 300 km orbit), while the Green-Blue and NIR images are up to 4,048 pixels wide (1.2 km).
HiRISE is a pushbroom imager, i.e. it uses time delay and integration (TDI) to increase the signal-to-noise ratio as it reads out image lines in time with the orbiter's ground speed. The total number of lines, or the image height, is limited by the onboard 28 Gb memory capacity. A nominal high-resolution red image is 20,000 × 40,000 pixels, or 800 megapixels and 4,000 × 40,000 pixels (160 megapixels) for the narrower images of the B-G and NIR bands. A single nominal red image will use 16.4 Gb. However, these images can be compressed, down to a total size of 5 Gigabits.
The Tools Used
The Difference It Made
The HiRISE camera is designed to view surface features of Mars in greater detail than has previously been possible. This allows for the study of the age of Martian features, the evidence of past or present water, the climate record and identification of landing sites for future robotic and manned missions. Images returned by HiRISE since its insertion in the Mars orbit in 2006 have exceeded expectations. NASA's Phoenix lander mission, to be launched in the summer of 2007, has already been using HiRISE images to identify hazards that were not discernible in previous images from orbit.