content long 19-October-2017 09:02:22


Payload Module

Image credit: Airbus Defence & Space

The Euclid payload consists of a 1.2-m-aperture telescope with two instruments: the visual imager (VIS) and the near-infrared spectrometer and photometer (NISP).

Both instruments share a large common field of view. VIS provides high quality images to carry out the weak lensing galaxy shear measurements. NISP performs imaging photometry to provide near-infrared photometric measurements for photometric redshifts, and also carries out slitless spectroscopy to obtain spectroscopic redshifts.

The telescope and instrument designs are challenging, but proven heritage from, for example, Gaia and JWST ensures high confidence to deliver the performance required.


Instrument characteristics
Visual imager (VIS)
Field-of-view 0.787 deg × 0.709 deg
Capability Visual imaging
Wavelength range 550 - 900 nm
Sensitivity 2.5 mag
10σ extended source
Detector Technology 36 arrays
4k × 4k CCD
Pixel Size
Spectral resolution
0.1 arcsec


Instrument characteristics
Near-infrared spectrometer and photometer (NISP)
Field-of-view 0.763 deg × 0.722 deg
Capability Near-infrared imaging photometry Near-infrared spectroscopy
Wavelength range Y (920 - 1146 nm) J (1146 - 1372 nm) H (1372 - 2000 nm) 1100 - 2000 nm
Sensitivity 24 mag
5σ  point source
24 mag
5σ  point source
24 mag
5σ  point source
3 × 10-16 erg cm-2 s-1
3.5σ  unresolved line flux
Detector Technology 16 arrays
2k × 2k near-infrared sensitive HgCdTe detectors
Pixel Size
Spectral resolution
0.3 arcsec 0.3 arcsec


Last Update: 24 March 2016

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