Satnews Daily
November 20th, 2019

Euclid Telescope Continues to Take Shape

The Euclid mission continues to take shape in Airbus cleanrooms: engineers are now finishing assembly of the telescope, the main instrument of the Payload Module, for which Airbus is responsible within this European Space Agency (ESA) mission led by Thales Alenia Space (TAS) as industrial prime contractor. The Euclid Payload Module contains the largest telescope with such optical performance ever designed and integrated by Airbus.

Photo of the work on Euclid is courtesy of Airbus.

After mounting the truss on the base plate, both made of silicon carbide, Airbus is now completing the final phase of integration: the optical alignment. The telescope will then be sent to Thales Alenia Space, where it will go through further testing and be integrated with the platform.

The entire payload integration necessitates extreme clean room discipline with a perfect cleanliness, temperature stability and lack of vibration. For example, during the mechanical assembly, precision of operations is calculated in µm, where for the optical alignment, the scale of precision is in nm (1 million nm in a millimeter).

Artistic renditions of the Euclid satellite.

Image is courtesy of ESA.

Euclid will collect high resolution images of the sky by pointing the spacecraft to a new field in deep space once every 80 minutes. Within six years of observation, covering more than one third of the entire sky, Euclid will measure the shapes of, and distances to, more than 1 billion galaxies.

The Euclid Payload Module has three primary features, the main telescope, a 1.2m diameter mirror and a three-mirror Korsch telescope. The main telescope is made entirely of lightweight silicon carbide (SiC) which gives it excellent thermal stability and enables operation at 130 K (-140°C), making it invisible to near infrared wavelengths. The 1.2 meter mirror permits diffraction-limited observation of galaxies as faint as magnitude 24.5, while the Korsch telescope supplies light to its two scientific instruments, the Visible Imager (VIS), and the Near-Infrared Spectrophotometer (NISP).