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SPIRou / Infrared SpectroPolarimeter

Image stabilization during first light at CFHT of the SPIRou Cassegrain unit

Gl 410, a red dwarf of 6th magnitude (at 1.7µm) with a surface temperature of 3200 °C, is one of the targets chosen for these guiding tests. Although the image of the star is distorted as a result of atmospheric turbulence, the 50 Hz tip-tilt system was shown to accurately maintain it on the entrance aperture at a precision of better than 0.01'' rms on 1 min intervals (© C. Moutou – CNRS/CFHT)