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2 June 1995 Optical design for the Rosetta wide-angle camera
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Rosetta is a cornerstone mission of ESA to have a roundez-vous with a periodic comet, namely Wirtanen P/1991 XVI. A basic instrument of its payload is an imaging system to observe this object both with a narrow and wide angle camera: during the approach phase, Rosetta will orbit around the comet and the two cameras will map the surface of the comet nucleus and the jets. In this paper a possible design for the wide angle camera is described: this solution adopts an all-reflecting, unobstructed three mirror configuration that permits to have a approximately equals 19 degrees X 17 degrees field of view with a F/3.2 aperture, with an optical quality of better than 80% geometrical encircled energy inside 150 microradians. The detector is a 2048 X 2048, 12 X 12 micrometers 2 pixel CCD, possibly coated with a suitable fluorescent layer to be sensitive also in the ultraviolet spectral region (above 120 nm). We also describe a possible option, namely to have an add-on spectroscopic channel for obtaining spectral information in the UV region from 120 nm to 240 nm, along a slit keeping a spectral resolution of R approximately equals 500 over at least two degrees.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Roberto Ragazzoni, Giampiero Naletto, Cesare Barbieri, and Giuseppe Tondello "Optical design for the Rosetta wide-angle camera", Proc. SPIE 2478, Space Telescopes and Instruments, (2 June 1995);

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