Physics
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995spie.2478..257r&link_type=abstract
Proc. SPIE Vol. 2478, p. 257-268, Space Telescopes and Instruments, Pierre Y. Bely; James B. Breckinridge; Eds.
Physics
1
Scientific paper
Rosetta is a cornerstone mission of ESA to have a rondezvous 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 (superscript 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.
Barbieri Cesare
Naletto Giampiero
Ragazzoni Roberto
Tondello Giuseppe
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