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Proceedings Paper

Analytic and experimental determination of ghosts in the Rosetta Narrow-Angle Camera and their impact on imaging performance
Author(s): Kjetil Dohlen; Laurent Jorda; Philippe Lamy; Imre Toth; Alain Origne
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Paper Abstract

The Rosetta cometary rendezvous mission, one of ESA's cornerstone missions, was launched in 2004 and will be inserted in orbit around comet 67P/Churyumov-Gerasimenko in 2014. One of its instruments, the Osiris Narrow Angle Camera (NAC), will take high-resolution images of the comet and map its nucleus as well as the jets of gas and dust emanating from localized areas. This is quite challenging as the contrast between the radiance of these jets and that of the nucleus is expected to be of the order of 1/1000. A major limitation comes from the presence of multiple ghosts which results from the presence of two filters and a protective window in front of the CCD detector. Rigorous knowledge of these instrumental ghost images is therefore required. We present analytical models of the structure and intensity of these ghosts, compare them with pre and post-launch observations, and describe image analysis tools developed to handle them.

Paper Details

Date Published: 10 August 2010
PDF: 9 pages
Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 773149 (10 August 2010); doi: 10.1117/12.857207
Show Author Affiliations
Kjetil Dohlen, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)
Laurent Jorda, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)
Philippe Lamy, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)
Imre Toth, Konkoly Observatory (Hungary)
Alain Origne, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)


Published in SPIE Proceedings Vol. 7731:
Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave
Jacobus M. Oschmann Jr.; Mark C. Clampin; Howard A. MacEwen, Editor(s)

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