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OSIRIS for the Rosetta Orbiter
The Optical, Spectroscopic, and Infrared Remote Imaging System OSIRIS is the scientific camera system on board the Rosetta spacecraft. OSIRIS comprises a high resolution Narrow Angle Camera unit and a Wide Angle Camera unitaccompanied by three electronics boxes. The NAC is designed to obtain high resolution images of the surface of comet 67P/Churyumov-Gerasimenko through 12 discrete filters over the wavelength range 250-1000nm at an angular resolution of 18.6 μrad per pixel.
The WAC is optimised to provide images of the near-nucleus environment in 14 discrete filters at an angular resolution of 101 μrad per pixel. The two units use identical shutter, filter wheel, front door, and detector systems. They are operated by a common Data Processing Unit. The OSIRIS instrument has a total mass of 35kg and is provided by six European Countries.
Reference : Keller et al, 2007, "OSIRIS - The Scientific System On-board Rosetta"
Detailed documentation about OSIRIS can be found in the Document folder contained within each dataset placed in the Planetary Science Archive