Explore the universe with Gaia: 3rd data delivery

On 13 June 2022, the new data delivery (DR3) was discontinued The Gaia Mission. This will be the first release of the full catalog of the mission, and the worldwide astronomical community will have immediate access to this unique data, published by the European Space Agency. This European astronomy event takes place at the Côte d’Azur Observatory (Nice) and illustrates the important role played by CNES and the French laboratories and observatories involved in the mission.

The main national and European actors involved in Gaia will be in Nice on 13 June to present the mission and content of this new catalog to the international, national and regional press as well as to the public. The most important scientific findings that are still under embargo to this day will be revealed. Unpublished news about the various components of the universe will then be presented. We can mention in particular the first chemical mapping of the Milky Way, which leads to a new understanding of our galaxy and the properties of the stars that make it up, an unprecedented exploration of the interstellar medium and the galactic disk, an unprecedented description of the small bodies of the solar system, …

Gaia spacecraftMany presentations are planned for this day as well as a press conference and discussion moments between the scientists and journalists present. The detailed program for the day will be unveiled in early June. Journalists wishing to attend this day and have early access to the scientific findings that will be revealed when the embargo is lifted should contact the Communications Department of the Côte d’Azur Observatory (

Gaia is a large mission of the European Space Agency (ESA), launched in 2013 to map the sky and observe both the very dense universe (solar system) and very distant (the most distant galaxies). More precisely, Gaia maps our galaxy, the Milky Way, in 3D and reveals its composition, formation and evolution. Gaia thus gives with unprecedented accuracy the position in the galaxy of almost 1.7 billion stars, or almost 1% of all the stars in the Milky Way. Thanks to the various instruments on board, the kinematics of a very large number of these stars are also determined as well as their physical properties (such as their surface temperature) and their chemical composition. The goals of this mission are therefore several and affect almost every branch of global astrophysics.


On the program for Monday, June 13, 2022

dome frame2 webAt the Grande Coupole in the historic site of Mont-Gros in Nice.

  • 8:30 – Welcoming guests of the Grande Coupole at the Mont-Gros site in Nice
  • 9:00 – Opening of the day, welcome speaker:
    Stephane Mazevet, Director of the Côte d’Azur Observatory,
    Philip Baptist, President of CNES (video message),
    Clara Herer, CNRS Côte d’Azur regional delegate
    Caroline Lawrence, Director of Orbital Systems and Applications at CNES,
    Anthony BrownDPAC chair,
    Philip Stee, Director of the Lagrange Laboratory (CNRS-UCA-OCA).
  • 9:20 – Gaia and the French contribution to the Gaia mission

  • 9:30 – Francois Mignard, Scientific Director of Gaia France: The Gaia Mission and the French Contribution
  • 9:45 – Chantal PanemGaia Mission and Operations Manager at CNES: The role of DR3 and CNES in the French contribution
  • 10:00 – ESA Gaia / DR3 event (in English, simultaneous translation for the public in Nice)

  • 10:00 – Explanatory video about Gaia
  • 10:01 – Intro by ESA moderator: Ninja Culture.
  • 10:02 – ESA’s Director General + ESA’s Director of Science
  • 10:08 – Video: Summary of DR3 outreach material
  • 10:09 – Gaia / DR3 presentations:

Timo PrustiGaia Project Scientist, ESA;
Anthony Brown, DPAC chair;
Antonella Vallenari, DPAC Vice Chairman;
Conny Aerts, professor at the University of Louvain.

  • 10:45 – Press conference. Questions and answers.

  • 10:50 – Pause

  • 11:00 – Press conference: the most important scientific results of DR3 and their French contributions

  • 11:00 – Paolo Tanga, astronomer at the Côte d’Azur Observatory, Lagrange Laboratory (CNRS-UCA-OCA), Planetology and small bodies in the solar system
  • 11:08 – Paola Sartoretti, CNRS Research Engineer at the Paris-PSL Observatory (GEPI – Paris-PSL Observatory / CNRS), The largest catalog of Stellar Speeds
  • 11:16 – Frederic Arenou, CNRS Research Engineer at the Paris-PSL Observatory (GEPI – Paris-PSL Observatory / CNRS), Discover hidden companions
  • 11:24 – Orlagh Creevey, Assistant Astronomer at the Côte d’Azur Observatory, Lagrange Laboratory (CNRS-UCA-OCA), Characterization of stars, dust and extragalactic objects
  • 11:35 – Alejandra Recio-Blanco, astronomer at the Côte d’Azur Observatory, Lagrange Laboratory (CNRS-UCA-OCA), The Milky Way: Cartography and Interstellar Medium
  • 11:48 – Christine Dustream, assistant astronomer at the Aquitaine Observatory of Sciences of the Universe, Bordeaux Astrophysics Laboratory (CNRS-University of Bordeaux), Gaia explores the deep universe
  • 12:00 – Opening of the DR3 archive (ESAC) – ESA event broadcast + CDS / Strasbourg presentation

  • 12:15 – Press conference, questions / answers

  • 13:00 – Buffet

  • 14:30 – Main results of DR3 and the French contribution (continued)

  • 14:30 – Marco Delbo, CNRS Research Director, Lagrange Laboratory (CNRS-UCA-OCA), The composition of the small bodies of the solar system revealed by Gaia
  • and Universarium visits

  • 14:45 – Mathias Schultheis, astronomer at the Côte d’Azur Observatory, Lagrange Laboratory (CNRS-UCA-OCA), Mapping of the interstellar medium using Gaia spectra
  • 15:30 – Universarium visit

18:30 – Conference open to the public only by registration:

What do the stars say about galactic history?

By Alejandra Recio-Blanco, astronomer at the Côte d’Azur Observatory, Lagrange Laboratory (CNRS-UCA-OCA)

On the occasion of the 3rde provision of catalog data Gaiaa free conference is open to the public Monday, June 13 at 18:30. in the Great Dome of the Observatory at Mont-Gros in Nice. Alejandra Recio-Blanco, astronomer at the Lagrange Laboratory (CNRS UCA OCA), will reveal to us during the conference what the stars are made of with data from the Gaia mission of the European Space Agency. Then A. Recio-Blanco will present the story of our galaxy to us: has our sun migrated since its formation? Did the Milky Way swallow smaller galaxies?

Come many by registering here.


Côte d’Azur Observatory

Patrick de Laverny, OCA Astronomer, Lagrange Laboratory (CNRS-UCA-OCA):

Marc Fulconis, Head of Communications, Côte d’Azur Observatory:


Olivia Baumann, Press Officer: 01 44 76 76 77; .

Pascale Bresson, Press Officer: 01 44 76 75 39;

CNES Press Area.

Paris-PSL Observatory

Frederic Arenou, CNRS Research Engineer at the Paris Observatory – PSL:
– 01 45 07 78 49

Frederick Auffret, responsible for press relations at the Paris Observatory – PSL:

Gaia Paris Observatory

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