Optical design and stray light analysis for the JANUS camera of the JUICE space mission
D Greggio ; D Magrin ; M Munari ... et al. ; et al. ; - ASI Sponsor
Sep - 2015
DOI: 10.1117/12.2206170

Event Title : Optical Systems Design 2015: Optical Design and Engineering VI
Published in: Proc. SPIE 9626, Optical Systems Design 2015: Optical Design and Engineering VI
Publisher: SPIE
type: Conference Proceedings

The JUICE (JUpiter ICy moons Explorer) satellite of the European Space Agency (ESA) is dedicated to the detailed study of Jupiter and its moons. Among the whole instrument suite, JANUS (Jovis, Amorum ac Natorum Undique Scrutator) is the camera system of JUICE designed for imaging at visible wavelengths. It will conduct an in-depth study of Ganymede, Callisto and Europa, and explore most of the Jovian system and Jupiter itself, performing, in the case of Ganymede, a global mapping of the satellite with a resolution of 400 m/px. The optical design chosen to meet the scientific goals of JANUS is a three mirror anastigmatic system in an off-axis configuration. To ensure that the achieved contrast is high enough to observe the features on the surface of the satellites, we also performed a preliminary stray light analysis of the telescope. We provide here a short description of the optical design and we present the procedure adopted to evaluate the stray-light expected during the mapping phase of the surface of Ganymede. We also use the results obtained from the first run of simulations to optimize the baffle design.

keywords : Cameras ; Optical design ; Stray light analysis ; Satellites ; Jupiter ; Mirrors ; Equipment and services ; Simulations ; Stray light ; Telescopes

Notes : This study wassupported by the Italian Space Agency (ASI) – Contract number: 2013-056-RO