The 16th of July 2019, the ESA’s Gaia satellite started his first mission extension after 5 years of producing operational observations (since 25th of July 2014). This mission is the successor of Hipparcos ESA’s satellite with the same objective of publishing a catalogue of stars and objects (galaxies, asteroids, etc.) but up to 1 billion objects (against 2.5 million). Gaia catalogue will determine the position, the distance and the movement of each object. To achieve this goal, a consortium, called DPAC, has been created to process all the satellite’s data composed of more than 450 people mostly in Europe (including scientists and engineers). 9 Coordination Units (CU) corresponding to dedicated themes and 6 data processing centres (DPCs) have been created. CNES is in charge of 3 scientific CUs (with 7 scientific pipelines) in operations, called DPCC. CNES is in DPAC an important DPC. The first catalogue has been released in September 2016, based on the first year of Gaia observations (2014/2015). The second catalogue has been published on the 25th of April 2018. Over one billion of sources have been processed. Operations are ongoing to prepare the third version of the catalogue (with an early release containing astrometric positions and photometry published on the 3rd of December 2020). This new version of the catalogue will include three years of Gaia observations. All CUs will produce data and the existing scientific algorithms will be improved. This catalogue will be available for the entire scientific community in 2021. DPCC will manage the processing of all delegated CUs for the first time, meanwhile performing daily operations, in a limited time.
New Questions Opened by the Big Data in the World of the Science Data Processing Centre for Gaia Mission in CNES
Springer Aerospace Techn.
2022-03-16
16 pages
Article/Chapter (Book)
Electronic Resource
English
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