Euclid spacecraft
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| Euclid spacecraft | |
|---|---|
| Name | Euclid |
| Mission type | Astrophysics |
| Operator | European Space Agency |
| COSPAR ID | 2023-092A |
| SATCAT | 57180 |
| Mission duration | 6 years (planned) |
| Spacecraft | Euclid |
| Manufacturer | Thales Alenia Space (prime contractor) |
| Launch mass | ~2,160 kg |
| Launch date | 1 July 2023, 15:12 UTC |
| Launch rocket | Falcon 9 Block 5 |
| Launch site | Cape Canaveral Space Force Station, Space Launch Complex 40 |
| Orbit reference | Sun–Earth L2 point |
| Orbit regime | Halo orbit |
| Programme | Cosmic Vision |
| Previous mission | Solar Orbiter |
| Next mission | JUICE |
Euclid spacecraft is a European Space Agency (ESA) mission designed to explore the composition and evolution of the dark universe. The space observatory is named after the ancient Greek mathematician Euclid and aims to create a three-dimensional map of the universe by observing billions of galaxies across more than a third of the sky. Its primary goal is to investigate the nature of dark energy and dark matter, which together are thought to govern the expansion of the universe and the formation of cosmic structure.
Overview
The mission was selected in 2011 as part of ESA's Cosmic Vision program, with Thales Alenia Space serving as the prime contractor for the spacecraft bus. A large consortium of European scientific institutes, led by the Euclid Consortium, provides the scientific instruments and data analysis. The project involves contributions from NASA and cooperation with other agencies like the Japan Aerospace Exploration Agency. By measuring the shapes, positions, and distances of galaxies over cosmic time, Euclid will provide unprecedented data to test theories of cosmology and fundamental physics.
Mission objectives
The core scientific objectives focus on understanding the accelerating expansion of the universe driven by dark energy and mapping the distribution of dark matter. Specifically, Euclid will measure weak gravitational lensing and baryon acoustic oscillations with high precision across a vast extragalactic survey. These measurements will constrain the equation of state of dark energy and test the validity of Einstein's general relativity on cosmological scales. The mission also aims to study galaxy evolution, large-scale structure, and the properties of exoplanets through additional science programs.
Spacecraft design
The spacecraft is based on a modified Eurostar platform, standing about 4.5 meters tall with a launch mass of approximately 2,160 kilograms. It features a large sunshield to protect its sensitive optics from solar radiation and maintain thermal stability. The design includes a 1.2-meter Korsch-type three-mirror anastigmat telescope, which provides a wide field of view for its instruments. Power is supplied by solar arrays, and precise pointing is achieved using reaction wheels and star trackers, with data transmitted via a high-gain antenna to ground stations like those in Cebreros.
Scientific instruments
Euclid carries two primary instruments that operate simultaneously in the visible and near-infrared wavelengths. The Visible Instrument (VIS) is a large CCD imager designed to measure the shapes of galaxies for weak lensing studies. The Near-Infrared Spectrometer and Photometer (NISP) performs photometry and spectroscopy to determine galaxy redshifts and distances. Both instruments are cooled to cryogenic temperatures to reduce noise and are managed by a dedicated payload module provided by the Euclid Consortium.
Launch and orbit
Euclid was launched on 1 July 2023 aboard a SpaceX Falcon 9 Block 5 rocket from Space Launch Complex 40 at Cape Canaveral Space Force Station. After a month-long journey, it entered a halo orbit around the Sun–Earth L2 point, a stable gravitational location about 1.5 million kilometers from Earth. This orbit, similar to that used by the James Webb Space Telescope, offers a stable thermal environment and an unobstructed view of deep space, essential for its six-year survey mission.
Mission timeline and status
Following launch, the spacecraft underwent a several-month commissioning and performance verification phase, including calibration of its instruments. The nominal science operations began in early 2024, with the mission planned to last until at least 2029. The survey will cover 15,000 square degrees of the extragalactic sky, free from Milky Way interference. ESA's European Space Operations Centre in Darmstadt manages flight operations, while science data is processed by the Euclid Consortium and archived at the European Space Astronomy Centre.
Scientific results and discoveries
Early data releases have already provided highly detailed images of galaxy clusters and dwarf galaxies, demonstrating the instruments' exceptional performance. Future data products will include a legacy catalog of billions of galaxies, enabling studies of cosmic shear, redshift-space distortions, and intracluster light. These datasets are expected to transform our understanding of dark sector physics, potentially revealing new insights into modified gravity theories and the ultimate fate of the universe.
Category:European Space Agency spacecraft Category:Space telescopes Category:Cosmology Category:Astronomical surveys