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English: Design of the Gaia satellite: the M4/M'4 mirrors and focal plane
  1. Incoming light from mirror M3
  2. Incoming light from mirror M'3
  3. Focal plane, containing the detector for the Astrometric instrument in light blue, Blue Photometer in dark blue, Red Photometer in red, and Radial Velocity Spectrometer in pink.
  4. Mirrors M4 and M'4, which combine the two incoming beams of light
  5. Mirror M5
  6. Mirror M6, which illuminates the focal plane
  7. Optics and diffraction grating for the Radial Velocity Spectrometer (RVS)
  8. Prisms for the Blue Photometer and Red Photometer (BP and RP)
Français : Schéma du satellite Gaia : des miroirs M4/M'4 au plan focal
  1. et
  2. faisceau lumineux en provenance des miroirs M3 et M'3;
  3. Plan focal;
  4. Miroirs M4/M'4;
  5. Miroir M5 ;
  6. Miroir M6 ;
  7. réseau de diffraction du spectromètre RVS;
  8. prismes des photomètres BP et RP.
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