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Euclid is an ESA mission designed to probe the dark Universe by mapping about one third of the sky (~15,000 deg²) over six years, measuring the shapes, positions and redshifts of billions of galaxies out to z ≈ 2. Its 1.2 m telescope feeds a visible imager (VIS) and a near-infrared spectro-photometer (NISP, Y/J/H imaging and slitless spectroscopy at 1206–1892 nm). Launched on 1 July 2023 to the Sun–Earth L2 point, Euclid completed commissioning with in-orbit performance in line with ground-test expectations, and the nominal survey began in early 2024. After the Quick Releases Q1 (March 2025) and Q2 (June 2026), the first major data release now proceeds in two stages: DR1-Foundation (~1900 deg², raw data, calibrated images, catalogues and spectra) in November 2026, and the complete DR1 with the higher-level products for clustering and weak lensing in mid-2027. This talk reviews the mission, its in-flight performance, the survey status and the release schedule.

BIO

W. Gillard is a researcher and lecturer at the Centre de Physique des Particules de Marseille (CPPM; IN2P3/CNRS, Aix-Marseille Université) and is coordinator of the Renoir team (Recherche de l’Énergie NOIRe) at CPPM. He is the NISP Instrument Scientist within the Euclid Consortium and a member of the ESA Euclid Science Advisory Committee. Involved in NISP since the start of its development in 2014, he took responsibility for instrument performance and calibration, from the ground test campaigns through in-flight commissioning and the calibration campaign. His work connects detector- and instrument-level understanding to cosmological inference: from the statistical characterisation of the instrument to the measurement of large-scale structure observables, such as baryon acoustic oscillations and the power spectrum. Earlier in his career, he also worked on indirect dark matter searches with cosmic rays.

Host: Cheng Zhao