Symposia S10  29-30 Jun 2026

Euclid: the first 2000 square degrees of the cosmos

Aims and scope

The Euclid mission, launched in July 2023 by the European Space Agency with contributions from NASA, is designed to create the most detailed map of the Universe ever produced. It is located at the Lagrange Point 2 and uses a 1.2-meter telescope with advanced visible (VIS) and near-infrared (NISP) instruments to survey approximately 14,000 square degrees of the sky. Over its six-year mission, Euclid is measuring the shapes, positions, and distances of billions of galaxies, some as far away as 10 billion light-years. Its goal is to understand the nature of dark matter and dark energy, the history of the Universe's expansion, and to enable a broad range of legacy science studies.

Following the preliminary Q1 quick data release in 2025, Euclid's first major public data release, DR1, is planned for October 2026. The Euclid Consortium has already begun analysing the 2,000 square degrees of DR1, which comprises calibrated VIS and NISP images and near-infrared spectra, stacked images, object catalogues, redshifts, and classifications. Supported by external data from DES, DESI, and UNIONS, together with simulations, it will produce summary statistics and cosmological constraints. DR1 also contains Euclid Deep Field data over 53 square degrees. This symposium will showcase the Euclid Consortium's initial DR1 results, introduce the material that will be made public with this release, and present the access routes and processing options that will be available to the community in just a few months.

Over the next few years, Euclid results will be synergistically combined with data from Roman and Rubin/LSST to produce the most complete object catalogue of our universe.

Programme

The topics covered include:

  • Cosmology
  • High-z Universe
  • Large-scale structure
  • Galaxy evolution
  • Nearby galaxies
  • Active galactic nuclei (AGN)
  • Low surface brightness Universe
  • Milky Way
  • Interstellar medium
  • Time domain
  • Gravitational waves
  • Stellar evolution
  • Exoplanets
  • Solar system
  • Data science & archives
  • Surveys & instruments
Six sessions are organised:

Session 1: Euclid Mission: Overview, timeline & processing

This session will provide a comprehensive introduction to the Euclid mission: its scientific goals, instruments, expected performance, and key outcomes from calibration and commissioning. It will outline the data processing pipeline and present the schedule and content of upcoming data releases.

Session 2: Cosmology with Euclid & synergies with other experiments

This session will highlight the prospects for cosmological discoveries over the coming decade, focusing on Euclid's contribution in combination with DES, DESI, UNIONS, Roman, and Rubin/LSST. It will provide an update on the status of Euclid's cosmology analysis with DR1 data.

Sessions 3-4-5: Euclid science highlights from internal & public data releases

These sessions will showcase scientific results based on Euclid's internal and public data releases, covering a wide range of topics including AGN, galaxy evolution, exoplanets, strong lensing, transients and supernovae, solar system objects, and studies of the nearby Universe.

We will reserve at least 2 lots of 15 minutes each for flash talks on ePosters.

Session 6: Exploring the Euclid survey: data products & access

This session will introduce the data products included in Euclid's public releases and demonstrate how to access and work with the processed data. A demonstration will be shown to help the community prepare to fully exploit Euclid's datasets for scientific research.

Invited speakers

We plan to have the following review talks (speakers TBC):

  • The Euclid mission and its instruments
  • Cosmological analysis with Euclid
  • Euclid in the context of Stage IV cosmology experiments
  • First results from Euclid DR1
  • Euclid data releases: content and access

    • Scientific organisers

    Mathilde Jauzac (Durham University, UK), Katarina (Dida) Markovic (JPL - Caltech/NASA, USA), Francine Marleau (University of Innsbruck, Austria), David Navarro Gironés (Leiden Observatory, Netherlands), Masamune Oguri (Chiba University, Japan), Cristobal Padilla (IFAE, Barcelona, Spain) (Chair), and Kerry Paterson (MPIA, Heidelberg, Germany).

    Contact

    Cristobal.Padilla @ ifae.es

    Updated on Mon Feb 09 12:29:01 CET 2026
    European Astronomical Society