CRISM (Compact Reconnaissance Imaging Spectrometer for Mars)
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Design

Specifications

Instrument System Properties

System Output
Mass 32.92 kg (72.5 lbs)
Power (during operations) 44.4-47.3 W
Power (during standby ) 16.1 W

Key Performance Characteristics:

Device Performance
Aperture 100 millimeters
Field of View 37 milliradians (about 2.06 degrees)
Spectral Range VNIR: 362-1053 nanometers*
IR: 1002-3920 nanometers**
Swath Width

11.1 kilometers at 300 kilometer altitude
(6.9 miles from 185 miles altitude)

Pointing +/- 60 degrees along the spacecraft ground track†
Focal Length 441 millimeters (13.4 inches)
Instantaneous FOV (Pixel Angular Size) 61.5 microradians (0.0035 degrees)
Spectral Sampling 6.55 nanometer/channel
Spatial Sampling

18.4 meter/pixel at 300 kilometer altitude
(60.4 feet/ pixel from 185 miles altitude)

*Above are CRISM’s full VNIR spectral ranges but the ranges that are most often used are 410-1020 nanometers
**Above are CRISM’s full IR spectral ranges but the ranges that are most often used are 1030-3920 nanometers

†During MRO’s extended mission (2010) CRISM’s gimbal started to show signs of age. The gimbal ran into “sticky spots” on its track making it difficult to reach its full pointing capabilities. Fearing CRISM would get stuck in that position, the team decided to change the along track positioning to between -60 and +30 degrees. Another sticky spot was found in 2012 and the along track positioning was again changed to between -1 and +30 degrees.

 
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