RAFTER: Ring Astrometric Field Telescope for Exo-planets and Relativity
| Autor: | Federico Landini, Mario Gai, Deborah Busonero, Alberto Vecchiato, Alberto Riva, Zheng-Hong Tang, Zhaoxiang Qi, Mario G. Lattanzi |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
business.industry Detector Astrophysics::Instrumentation and Methods for Astrophysics FOS: Physical sciences Astrometry Exoplanet Square degree Metrology law.invention Telescope Optical axis Cardinal point Optics law Astrophysics::Solar and Stellar Astrophysics business Astrophysics - Instrumentation and Methods for Astrophysics Instrumentation and Methods for Astrophysics (astro-ph.IM) |
| Popis: | High precision astrometry aims at source position determination to a very small fraction of the diffraction image size, in high SNR regime. One of the key limitations to such goal is the optical response variation of the telescope over a sizeable FOV, required to ensure bright reference objects to any selected target. The issue translates into severe calibration constraints, and/or the need for complex telescope and focal plane metrology. We propose an innovative system approach derived from the established TMA telescope concept, extended to achieve high filling factor of an annular field of view around the optical axis of the telescope. The proposed design is a very compact, 1 m class telescope compatible with modern CCD and CMOS detectors (EFL = 15 m). We describe the concept implementation guidelines and the optical performance of the current optical design. The diffraction limited FOV exceeds 1.25 square degrees, and the detector occupies the best 0.25 square degree with 66 devices. 15 pages, 12 figures; Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave |
| Databáze: | OpenAIRE |
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