Gaia DPCT

Gaia DPCT Gaia DPCT development and operations is a joint effort between the science team of the Astronomical Observatory of Torino (P.I. Prof. Mario Lattanzi) and the ALTEC industry team.

ALTEC is in charge of providing the overall HW, SW infrastructure and DB required for running the scientific SW components, which represent part of Italian Contribution to the ESA Gaia mission.

After two years of activities (2008/09-2009/10), DPCT test and development platform is operative and the Italian centre is completely integrated in DPAC system. All is ready, now, to participate at the first E2E (end-to-end) tests of the complete scientific segment, foreseen to start in the middle of March 2011, with the six European DPCs involved in the demonstration and verification of the capacity of the systems developed up to now.

Gaia Mission
Gaia is an ESA Cornerstone mission, scheduled to be launched in spring 2013 and with a planned lifetime of 5 years , dedicated to precisely measure the positions and motions of over a billion stars in our galaxy, the Milky Way.
The mission aims to obtain astrometric data with a precision two hundred times greater than that of Hipparcos and astrophysical information on brightness in different spectral bands that will allow studying in detail the formation, dynamics, chemistry and evolution of our galaxy. It will also be possible to detect extrasolar planets and observe asteroids, galaxies and quasars.
Gaia satellite is completely developed by ESA, including also the scientific instruments. The contribution of member states is devoted to the scientific program. Italy is the third contributor country.

Gaia Ground Segment
The Gaia mission requires, as a critical element, the construction of a Ground Segment (GS) that shall be operative for all the duration of the mission and, subsequently, up to the achievement of the expected quality before the result publication and distribution to the international scientific community.

The GS is composed of six different Data Processing Centres (DPCs) and its implementation and management is the primary task of the European consortium DPAC, responsible for ESA of the reduction of data of the mission. The six centers are: ESAC/DPCE, CNES/DPCC, Barcelona/DPCB, Cambridge/ DPCI, Geneva/DPCG and Turin/DPCT.

The responsibility for reducing the enormous amount of data that will be produced by the mission is entrusted to the DPAC (Data Processing and Analysis Consortium), a consortium of European research institutions created in response to an ESA Announcement of Opportunity. The DPAC is structured into 8 Coordination Units (CU), each responsible for a particular aspect of data processing.

Gaia DPCT description
Gaia DPCT, the Italian Data Processing Centre, is hosted and operated at ALTEC centre in Turin. The primary objective of DPCT is to provide the infrastructure (in terms of HW, SW and communications) and operations support to the Astrometric Verification Unit (AVU) activities for CU3 and the Italian participation to the Gaia data processing tasks. DPCT will archive all of the data (photometric calibration data, libraries of spectra, etc) produced for and delivered to DPAC as part of the Italian contribution to the activities of CU4, CU5, CU7, and CU8.
AVU is the unit responsible for the development and maintenance of the following CU3 software products:

AIM – Astrometric Instrument Model, in charge of processing the Astro data telemetry in order to monitor and analyse the Astro instrument response over the mission lifetime.

BAM/AVU – Basic Angle Monitoring software system, in charge of processing the BAM device telemetry in order to monitor and analyse the BA behaviour over time.

GSR – Global Sphere Reconstruction, the mathematical and numerical framework that shall be used to verify the global astrometric results produced by AGIS.

In addition the DPCT will provide hosting and operations of the GAia Relativistic Experiment on Quadrupole experiment (GAREQ) and of Initial Gaia Source List (IGSL) database. The IGSL DB will be maintained and upgraded throughout the Gaia operational lifetime and will be used to produce upgraded version of the IGSL catalogue to be delivered periodically to ESAC and ingested in the Main DB.

DPCT Reference Architecture

Link to INAF/OATO website “Gaia Mission and Italian participation”:
http://www.oato.inaf.it/astrometry/Gaia_Italia/index.html

Other Interesting Links:
Exploration seen by NASA and ESA
http://www.nasa.gov/mission_pages/exploration/main/index.html http://www.esa.int/esaHS/exploration.html
http://www.esa.int/SPECIALS/Space_Year_2007/SEM2ATQ08ZE_0.html ESA-KIDS
High resolution planetary observation: http://pianeti.uai.it/index.php/Alta_Risoluzione