2 August 2014 EChO fine guidance sensor design and architecture
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EChO, the Exoplanet Characterization Observatory, is an M-class candidate in the ESA Comic Vision programme. It will provide high resolution, multi-wavelength spectroscopic observations of exoplanets, measure their atmospheric composition, temperature and albedo. The scientific payload is a spectrometer covering the 0.4-11 micron waveband. High photometric stability over a time scale of about 10 hours is one of the most stringent requirements of the EChO mission. As a result, fine pointing stability relative to the host star is mandatory. This will be achieved through a Fine Guidance Sensor (FGS), a separate photometric channel that uses a fraction of the target star signal from the optical channel. The main task of the FGS is to ensure the centering, focusing and guiding of the satellite, but it will also provide supplemental high-precision astrometry and photometry of the target to ground for de-trending the spectra and complementary science. In this paper we give an overview of the current architectural design of the FGS subsystem and discuss related requirements as well as the expected performance.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Roland Ottensamer, Roland Ottensamer, Miroslaw Rataj, Miroslaw Rataj, Jan-Rutger Schrader, Jan-Rutger Schrader, Roman Ferstl, Roman Ferstl, Manuel Güdel, Manuel Güdel, Franz Kerschbaum, Franz Kerschbaum, Armin Luntzer, Armin Luntzer, "EChO fine guidance sensor design and architecture", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91434O (2 August 2014); doi: 10.1117/12.2056475; https://doi.org/10.1117/12.2056475


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