Euclid is a science mission. The For Scientists menu contains more specialised info aimed at scientists wanting to work with Euclid data and stay up to date with developments in the EC and the Euclid mission. This summary below is meant as a quick reference for key facts and numbers, as well as the papers from which these are taken, which contain deeper background information.
Basic mission data
Launcher: SpaceX Falcon 9 from Cape Canaveral
Orbit: Sun-Earth Lagrange point 2 (L2)
Type: Korsch off-axis three mirror anastigmat; Silicon Carbide telescope
Aperture: 1.20m diameter primary mirror, 9926cm² effective collection area
calibration unit (NI-CU), for flat-fields and other calibration purposes:
5 LEDs from ~920 to ~2000 nm
Euclid will conduct two major surveys, the Euclid Wide Survey (EWS) and the Euclid Deep Survey (EDS), as well as repeatedly cover two fields to increase spectroscopic completeness and decrease confusion (CPC fields), and a number of legacy fields, the Euclid Auxilliary Fields (EAFs).
The Euclid CPC fields will each subtend 20 deg2 and will be repeatedly observed at different times to obtain grism spectroscopy at different orientation angles on the sky. Their field centers have been chosen to coincide with the EDF-North and EDF-South, so the CPC fields are not separate fields from the EDS fields.
Euclid Auxiliary Fields
The EAFs will be used to calibrate photometric redshifts and colour-gradients (EC: Scaramella+ 2022, Sec. 6.2). They are these six well-known fields, plus an extra field for photometric self-calibration of the survey. Depth refers to increase in SNR compared to the Wide Survey: