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!
|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)
|12 on 2 wheels
|14 on 2 wheels
|Pixel size (mrad)||average 0.0186||
0.0965 (y) x 0.101-0.106 (x)
|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|
|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|
|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|
|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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