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12 October 1996 Two-mirror planetary camera with an off-Rowland UV spectograph for the Rosetta space mission
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An all-reflective, unobstructed and unvignetted optical design for a wide field of view (12 degree(s) squared) camera is described. The camera is obtained by two sections of conical surfaces and allows an efficient stray light rejection, in order to detect faint gaseous features in the neighborhood of the comet nucleus against its bright body. Very good optical performances are obtained with a 2048 X 2048 CCD array detector allowing more than 90% of the encircled energy into a single 12 micrometers squared pixel over the whole detector area. Distortion is kept to a few percent allowing a backup operation of this camera for navigation purposes. Also an add-on option of an off-Rowland quasi-stigmatic spectrograph is described. The optical design is such that this spectrograph is fed by a plane mirror mounted on the camera filter wheel, and the spectrum is sent on the same CCD detector of the imaging mode in a similar way. Thus a very low resource additional spectroscopic option is obtained. This channel mounts a 4 degree(s) length entrance slit, and permits to obtain a very good spectral and spatial resolution.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Giampiero Naletto, Enrico Marchetti, and Roberto Ragazzoni "Two-mirror planetary camera with an off-Rowland UV spectograph for the Rosetta space mission", Proc. SPIE 2807, Space Telescopes and Instruments IV, (12 October 1996);


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