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Proceedings Paper

The optical design and preliminary optomechanical tolerances of the high resolution imaging channel for the BepiColombo mission to Mercury
Author(s): Gabriella Marra; Luigi Colangeli; Elena Mazzotta Epifani; Pasquale Palumbo; Stefano Debei; Enrico Flamini; Giampiero Naletto
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Paper Abstract

This paper deals with the optical design and preliminary optomechanical tolerances of HRIC, the High Resolution Imaging Channel of the SIMBIO-SYS instrument, selected as part of the scientific payload for the ESA cornerstone BepiColombo mission to Mercury. Under the lead of Italy (Principal Investigator: E. Flamini), the project is based on an international co-operation with Institutes from France and Switzerland. Starting from the stringent scientific requirement of 5m ground pixel scale at 400 km from the planet surface, a robust optical design based on a catadioptric Ritchey-Chretien configuration modified with a dedicated corrector camera has been achieved. The optimized configuration is convenient in terms of image quality, number of optical elements, and total length. The channel guarantees a corrected FoV of about 1.5° and allows the achievement of the required resolution with a detector of 2k × 2k pixels. The telescope is diffraction limited, thanks to its focal ratio (F/8), and shows an optimised radiometric flux within the operative spectral range (400 - 900 nm). The channel is equipped with one panchromatic and 3 selective filters. The operation plan foresees the coverage of at least 20% of the whole Hermean surface with the HRIC. The preliminary optomechanical tolerances and the corresponding image quality have been analyzed. Further thermo-mechanical analysis is in progress, which is being analyzed by means of ray-tracing tools for image quality evaluation.

Paper Details

Date Published: 6 July 2006
PDF: 9 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 627328 (6 July 2006); doi: 10.1117/12.671444
Show Author Affiliations
Gabriella Marra, INAF, Astronomical Observatory of Capodimonte (Italy)
Luigi Colangeli, INAF, Astronomical Observatory of Capodimonte (Italy)
Elena Mazzotta Epifani, INAF, Astronomical Observatory of Capodimonte (Italy)
Pasquale Palumbo, Univ. Parthenope (Italy)
Stefano Debei, CISAS, Univ. of Padova (Italy)
Enrico Flamini, ASI, Italian Space Agency (Italy)
Giampiero Naletto, Univ. of Padova (Italy)

Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)

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