Euclid has two instruments: a wide-field visible light imager, and a near-infrared imaging photometer and slitless spectrometer:
VIS instrument:
- Focal plane array: 6×6 CCDs (4k×4k pixels each) with 0.101 arcsec pixel platescale
- Field of view: 0.56 (deg)2
- Wavelength coverage: one wide visible band (550-900 nm)
- System point-spread function: 0.16 arcsec (FWHM) excluding pixelisation
NISP instrument:
- Focal plane array: 4×4 HgCdTe NIR detectors (2k×2k pixels each) with 0.3 arcsec per pixel and 2.3 µm cut-off wavelength.
- Imaging bands: Y (0.95 to 1.192 µm), J (1.192 to 1.544 µm), H (1.544 to 2 µm)
- Grisms: 1 blue grism (0.92 to 1.3 µm); 3 identical red grisms (1.25 to 1.85 µm) at position angles 0 deg, 90 deg, 180 deg.
- Spectral resolution: constant Δλ at λ/Δλ ˃ 380 for an object of 0.5 arcsec diameter
- FoV: 0.55 (deg)2
FoV common to VIS & NISP: 0.53 (deg)2
