28 August 2014 The JANUS camera onboard JUICE mission for Jupiter system optical imaging
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JANUS (Jovis, Amorum ac Natorum Undique Scrutator) is the visible camera selected for the ESA JUICE mission to the Jupiter system. Resources constraints, S/C characteristics, mission design, environment and the great variability of observing conditions for several targets put stringent constraints on instrument architecture. In addition to the usual requirements for a planetary mission, the problem of mass and power consumption is particularly stringent due to the long-lasting cruising and operations at large distance from the Sun. JANUS design shall cope with a wide range of targets, from Jupiter atmosphere, to solid satellite surfaces, exosphere, rings, and lightning, all to be observed in several color and narrow-band filters. All targets shall be tracked during the mission and in some specific cases the DTM will be derived from stereo imaging. Mission design allows a quite long time range for observations in Jupiter system, with orbits around Jupiter and multiple fly-bys of satellites for 2.5 years, followed by about 6 months in orbit around Ganymede, at surface distances variable from 104 to few hundreds km. Our concept was based on a single optical channel, which was fine-tuned to cover all scientific objectives based on low to high-resolution imaging. A catoptric telescope with excellent optical quality is coupled with a rectangular detector, avoiding any scanning mechanism. In this paper the present JANUS design and its foreseen scientific capabilities are discussed.
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Vincenzo Della Corte, Nicole Schmitz, Michele Zusi, José Maria Castro, Mark Leese, Stefano Debei, Demetrio Magrin, Harald Michalik, Pasquale Palumbo, Ralf Jaumann, Gabriele Cremonese, Harald Hoffmann, Andrew Holland, Luisa Maria Lara, Björn Fiethe, Enrico Friso, Davide Greggio, Miguel Herranz, Alexander Koncz, Alexander Lichopoj, Ignacio Martinez-Navajas, Elena Mazzotta Epifani, Harald Michaelis, Roberto Ragazzoni, Thomas Roatsch, Julio Rodrigo, Emilio Rodriguez, Pietro Schipani, Matthew Soman, Mirco Zaccariotto, "The JANUS camera onboard JUICE mission for Jupiter system optical imaging", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91433I (28 August 2014); doi: 10.1117/12.2056353; https://doi.org/10.1117/12.2056353

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