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Rosetta's OSIRIS camera instrument

The Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) is the main imaging system of the Rosetta mission. It consists of two cameras, one narrow-angle and one wide-angle. The narrow-angle camera (NAC) is intended for high-resolution mapping of the nucleus of comet Churyumov-Gerasimenko, while the wide-angle camera (WAC) is optimized for mapping the gas and dust in space in the vicinity of the comet. When it is at the comet, OSIRIS NAC will be able to capture photos with resolutions as high as two centimeters per pixel! To capture images in a wide variety of ranges, the NAC has focusing plates that enable it to do both far-focus (2 km to infinity) and near-focus (1 to 2 km) imaging.

The information onthis page came from Keller et al. 2007, "OSIRIS - The Scientific Camera System Onboard Rosetta" (PDF)

Credit for OSIRIS data should go to "ESA / OSIRIS Team MPS / UPD / LAM / IAA / RSSD / INTA / UPM / DASP / IDA" but one could be forgiven for writing "ESA / MPS / OSIRIS Team."

Note: OSIRIS image data usually needs to be mirror-flipped. Check the orientation of the images carefully!

Specifications
CameraNarrow-angleWide-angle
Field of view
2.20 x 2.22°
(38.4 x 38.7 mrad)
11.35°(y) x 12.11°(x)
(198 x 211 mrad)

 Spectral filters

12 on 2 wheels
mostly medium-band
14 on 2 wheels
mostly narrow-band
 Spectral range 250-1000 240-720
 Pixel size (mrad) average 0.0186

0.0965 (y) x 0.101-0.106 (x)
average 0.101

 Detector size (pixels) 2048 x 2048 2048 x 2048 

Naming conventions for images include the date, time in hours and minutes, and a spacecraft clock count. The last two digits in the file name identify the filters used. There are two overlapping filter wheels on each camera. For true-color NAC images, look for RGB combinations made with images ending with 12/13/14 or 82/83/84.

Filters: Narrow-Angle Camera
NameCentral
Wavelength
(nm)
Bandwidth
(nm)
Purpose
8x Neutral 640 520 Passes only 5% of light (neutral density filter)
3x NFP-Vis 600 >600 Refocusing lens for near-field imaging
2x FFP-Vis 600 600 Refocusing lens for near-field imaging
1x FFP-UV 600 >600 Clear filter for far-field imaging with wheel 2 filters
x1 FFP-IR 600 >600 Clear filter for far-field imaging with wheel 1 filters
x5 Far-UV 269.3 53.6 Surface spectral reflectance
x6 Near-UV 360.0 51.1 Surface spectral reflectance
x4 Blue 480.7 74.9 Surface spectral reflectance
x3 Green 535.7 62.4 Surface spectral reflectance
x2 Orange 649.2 84.5 Surface spectral reflectance
x7 Hydra 701.2 22.2 Water of hydration band
x8 Red 743.7 64.1 Surface spectral reflectance
5x Ortho 805.3 40.5 Orthopyroxene
4x Near-IR 882.1 65.9 Surface spectral reflectance
6x Fe2O3 931.9 34.9 Iron-bearing minerals
7x IR 989.3 38.2 IR surface reflectance

The wide-angle camera is designed mostly for studying gas emission. There are medium-band red and green filters (12 and 21, respectively), but they are not often used, and there is no blue filter. The combination of narrowband filters that is closest to the RGB combinations in the narrow-angle camera is OI/NH2/CN (17/15/14), but proceed with caution.

Filters: Wide-Angle Camera
NameCentral
Wavelength
(nm)
Bandwidth
(nm)
Purpose
1x Empty -- -- Empty position for use with wheel 2
x1 Empty -- -- Empty position for use with wheel 1
3x UV245 246.2 14.1 Continuum surface spectral reflectance
4x CS 259.0 5.6 CS gas emission
5x UV295 295.9 10.9 Continuum for OH
6x OH-WAC 309.7 4.1 OH emission near nucleus
7x UV325 325.8 10.7 Continuum for OH, surface spectral reflectance
8x NH 335.9 4.1 NH gas emission
x3 UV375 375.6 9.8 Continuum for CN, surface spectral reflectance
x4 CN 388.4 5.2 CN gas emission
2x Green 537.2 63.7 Dust continuum
x5 NH2 572.1 11.5 NH2 gas emission
x6 Na 590.7 4.7 Sodium gas emission
x8 VIS610 612.6 9.8 Continuum for OI, surface spectral reflectance
x7 OI 631.6 4.0 O gas emission for dissociation of H2O
x2 Red 629.8 156.8 Broadband filter for nucleus and asteroid detection
and redundancy with NAC
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