The new Gemini North AO (GNAO) laser guide star facility (LGSF) needs four Laser Launch Telescopes (LLTs) to enable both wide and narrow field corrections using GLAO and LTAO. Early in 2021 Officina Stellare has been awarded a contract to design and build four LLTs. Based on a preliminary LLT design submitted during the call for tender phase, Officina Stellare performed a one-year design study, starting the manufacturing of an engineering and qualification model (EQM) to validate this design and minimize risks on the production of the four deliverable units. Manufacturing of optical and mechanical parts for the EQM is almost completed, including the large aspherical lens, made in-house by CNC optical polishing and tested by high-resolution interferometry. A COTS hexapod provides the active mechanism for a field steering mirror. In-house tests have already validated its performances.
EnVisS (Entire Visible Sky) is an all-sky camera specifically designed to fly on the space mission Comet Interceptor. This mission has been selected in June 2019 as the first European Space Agency (ESA) Fast mission, a modest size mission with fast implementation. Comet Interceptor aims to study a dynamically new comet, or interstellar object, and its launch is scheduled in 2029 as a companion to the ARIEL mission. The mission study phase, called Phase 0, has been completed in December 2019, and then the Phase A study had started. Phase A will last for about two years until mission adoption expected in June 2022. The Comet Interceptor mission is conceived to be composed of three spacecraft: spacecraft A devoted to remote sensing science, and the other two, spacecraft B1 and B2, dedicated to a fly-by with the comet. EnVisS will be mounted on spacecraft B2, which is foreseen to be spin-stabilized. The camera is developed with the scientific task to image, in push-frame mode, the full comet coma in different colors. A set of ad-hoc selected broadband filters and polarizers in the visible range will be used to study the full scale distribution of the coma gas and dust species. The camera configuration is a fish-eye lens system with a FoV of about 180°x45°. This paper will describe the preliminary EnVisS optical head design and analysis carried out during the Phase 0 study of the mission.
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