The work will describe the activities performed in the framework of the realization of a laboratory set-up for the integration and testing of a prototype of the EnVisS fish-eye camera. The EnVisS instrument is an all-sky camera conceived, and specifically designed, for Comet Interceptor, an ESA Fast mission foreseen to launch in 2029 to study a dynamically new comet. EnVisS will be mounted on a spinning stabilized probe performing a fast, about 20 hours, fly-by of the comet; the instrument task is to image the full coma of the comet in the 550-800 nm wavelength range to study the dust properties and its distribution. At the CNR-IFN premises in Padova-Italy, an ad-hoc laboratory test bench has been devised and set-up to integrate the EnVisS prototype and allow the verification of its optical performance. The final goal of the set-up will be twofold. At first, the EnVisS breadboard optical head developed by Leonardo S.p.A. (Florence-Italy) will be assembled with a dummy filter and a COTS detector package. After, together with the verification of the prototype optical performance, carry on a simulation of the acquisition scheme foreseen for the camera in flight. In this paper, the requirements for the set-up and the solutions adopted for its realization will be presented. An overview of the results obtained during the commissioning of the lab set-up, performed with some commercial elements (i.e. a fish-eye lens coupled to a camera), will be given.
JANUS (Jovis Amorum Ac Natorum Undique Scrutator) is a high-resolution camera operating in the spectral range 340-1080 nm and designed for the ESA space mission JUICE1 (Jupiter Icy moons Explorer) planned for launch in 2023 and arrival at Jupiter in 2031. The main scientific goal of the mission is the detailed investigation of Jupiter and its Galileian moons: after three years in Jupiter orbit and many fly-bys with the icy moons, JUICE will be the first spacecraft to be inserted in orbit around Ganymede in 2032. During the final stage of the mission, JANUS is expected to provide images of the moon surface with ground sampling up to 7.5 m/pixel in both panchromatic and narrow band spectral ranges. Leonardo Spa is the JANUS prime contractor and is in charge, on behalf of the Italian Space Agency (ASI) and in collaboration with the science team led by Parthenope University and the Italian Institute of Astrophysics (INAF), of developing and integrating the Opto-Mechanical Structure of JANUS Optical Head Unit (OHU). The present paper will discuss the procedure adopted for the integration of the OHU and the results in terms of optical quality of the system in flight conditions. Ensuring a Modulation Transfer Function (MTF) close to the diffraction limit at the Nyquist frequency of 71.4 cy/mm constitutes the main challenge for the telescope integration and sets the maximum acceptable transmitted wavefront error to be at most a few tens of nm over the whole field of view.
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