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25 September 2017 The CHEOPS calibration bench
F. Wildi, B. Chazelas, A. Deline, M. Sarajlic, M. Sordet
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Proceedings Volume 10562, International Conference on Space Optics — ICSO 2016; 105623H (2017) https://doi.org/10.1117/12.2296041
Event: International Conference on Space Optics — ICSO 2016, 2016, Biarritz, France
Abstract
CHEOPS is an ESA Class S Mission aiming at the characterization of exoplanets through the precise measurement of their radius, using the transit method [1]. To achieve this goal, the payload is designed to be a high precision “absolute” photometer, looking at one star at a time. It will be able to cover la large fraction of the sky by repointing. Its launch is expected at the end of 2017 [2, this conference]. CHEOPS’ main science is the measure of the transit of exoplanets of radius ranging from 1 to 6 Earth radii orbiting bright stars. The required photometric stability to reach this goal is of 20 ppm in 6 hours for a 9th magnitude star. The CHEOPS’ only instrument is a Ritchey-Chretien style telescope with 300 mm effective aperture diameter, which provides a defocussed image of the target star on a single frame-transfer backside illuminated CCD detector cooled to -40°C and stabilized within ~10 mK [2]. CHEOPS being in a LEO, it is equipped with a high performance baffle. The spacecraft platform provides a pointing stability of < 2 arcsec rms. This relatively modest pointing performance makes high quality flat-fielding necessary In the rest of this article we will refer to the only CHEOPS instrument simply as “CHEOP” Its behavior will be calibrated thoroughly on the ground and only a small subset of the calibrations can be redone in flight. The main focuses of the calibrations are the photonic gain stability and sensibility to the environment variations and the Flat field that has to be known at a precision better than 0.1%.
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F. Wildi, B. Chazelas, A. Deline, M. Sarajlic, and M. Sordet "The CHEOPS calibration bench", Proc. SPIE 10562, International Conference on Space Optics — ICSO 2016, 105623H (25 September 2017); https://doi.org/10.1117/12.2296041
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KEYWORDS
Calibration
Stars
Astronomical imaging
Mirrors
Optical fibers
Integrating spheres
Satellites
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