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| PLANCK (ESA mission) | |
|---|---|
| Name | PLANCK (ESA mission) |
| Mission type | Space telescope |
| Operator | European Space Agency |
| Mission duration | 2009–2013 (operations); extended analysis ongoing |
| Manufacturer | Thales Alenia Space, Astrium |
| Launch date | 14 May 2009 |
| Launch vehicle | Arianespace Ariane 5 |
| Launch site | Guiana Space Centre |
| Orbit | L2 halo orbit |
| Instruments | Low Frequency Instrument, High Frequency Instrument |
PLANCK (ESA mission) was a European Space Agency scientific satellite designed to map the anisotropies of the cosmic microwave background across the entire sky with unprecedented sensitivity, angular resolution, and frequency coverage. Launched by Arianespace on 14 May 2009 from the Guiana Space Centre, PLANCK operated from a halo orbit around the Sun–Earth Lagrange point L2 and produced multiple data releases that transformed cosmology, astrophysics, and studies of the early universe. The mission involved international collaboration among institutes in France, Germany, Italy, the United Kingdom, the United States, and other countries under ESA coordination.
PLANCK was conceived to follow on results from missions including COBE, WMAP, and ground-based experiments such as BOOMERanG, MAXIMA, and DASI. The mission combined cryogenic technology developed by teams at European Space Research and Technology Centre, Centre National d'Études Spatiales, and NASA partners to achieve instrument temperatures near 0.1 kelvin. Scientific leadership included researchers affiliated with institutions such as Institut d'Astrophysique Spatiale, Max Planck Institute for Astrophysics, University of Cambridge, Princeton University, California Institute of Technology, and Harvard University. PLANCK's design heritage drew on heritage from projects by Thales Alenia Space, Astrium, and components tested at Jet Propulsion Laboratory facilities.
The PLANCK spacecraft hosted two complementary instruments: the Low Frequency Instrument (LFI) and the High Frequency Instrument (HFI). LFI, developed by an international consortium including Institute of Radio Astronomy of Bologna, used radiometers operating at 30, 44, and 70 GHz, while HFI, developed by a consortium led by Centre d'Étude Spatiale des Rayonnements and Institut d'Astrophysique Spatiale, used bolometers at frequencies from 100 to 857 GHz. Cryogenic subsystems incorporated technologies from Airbus Defence and Space partners and cooling stages influenced by work at SRON Netherlands Institute for Space Research and National Institute of Standards and Technology. Optical design featured a dual-reflector Gregorian telescope with reflective surfaces manufactured and tested at facilities associated with Thales Alenia Space and Rutherford Appleton Laboratory. Onboard systems included attitude control derived from programs at European Space Operations Centre and data handling influenced by protocols from European Southern Observatory collaborations.
After launch on an Ariane 5 from the Guiana Space Centre, PLANCK was inserted into a Lissajous orbit about Lagrange point L2 alongside contemporaneous missions such as Herschel Space Observatory. Operations were coordinated through ESA's Mission Operations Centre with science planning by the Planck Collaboration and data scheduling harmonized with agencies including CNES, DLR, ASI, and NASA. The spacecraft scanned the sky by spinning and repointing, producing overlapping survey passes that enabled systematic error mitigation techniques developed with input from Max Planck Institute for Extraterrestrial Physics, University of Oxford, University of California, Berkeley, and Leiden University. Cryogenic lifetime, influenced by consumables and cooling chain performance, determined HFI's active cryogen period and subsequent warm mission phases.
Primary objectives included precise measurement of angular power spectra of the cosmic microwave background temperature and polarization anisotropies to constrain parameters of the Lambda-CDM model, cosmic inflation scenarios studied in works connected to Alan Guth, Andrei Linde, and Paul Steinhardt, and to measure the ionization history related to reionization epoch research. PLANCK produced high-fidelity maps of foregrounds—thermal dust emission traced with insights from Herschel Space Observatory, synchrotron emission studied alongside WMAP comparisons, and polarized Galactic magnetic field structures relevant to studies at Max Planck Institute for Radio Astronomy and Harvard–Smithsonian Center for Astrophysics. Key results included tight constraints on the Hubble constant debated with measurements from Hubble Space Telescope teams, refined estimates of baryon density connected to Big Bang nucleosynthesis studies, limits on primordial non-Gaussianity related to theoretical analyses by Juan Maldacena and Nima Arkani-Hamed, and improved constraints on neutrino properties pertinent to experiments at Super-Kamiokande and IceCube collaborations.
Data processing was carried out by the Planck Collaboration through coordinated pipelines developed by teams at European Space Agency, CNES, DLR, ASI, INAF, SRON, Niels Bohr Institute, University of Manchester, and Leiden University. Releases included early products for cross-calibration with WMAP and later major releases (2013, 2015, 2018) that provided maps, power spectra, likelihood codes, and component-separated foreground products used by researchers at Princeton University, University of Chicago, Columbia University, University of Cambridge, and University of Oxford. Data validation involved comparisons with catalogs from Sloan Digital Sky Survey, Two Micron All Sky Survey, and radio surveys from Very Large Array and Parkes Observatory, while component separation algorithms built on methods from Independent component analysis research teams and statistical frameworks developed in collaborations with groups at ETH Zurich and Imperial College London.
PLANCK's legacy spans cosmology, Galactic astrophysics, and technology. Its cosmological parameter constraints influenced theoretical work at institutions such as Institute for Advanced Study, Perimeter Institute, and Kavli Institute for Cosmology and shaped follow-up plans for missions including Euclid (spacecraft), LiteBIRD, and ground campaigns like Atacama Cosmology Telescope and South Pole Telescope. PLANCK fostered data-analysis toolchains reused by projects associated with Square Kilometre Array, James Webb Space Telescope, and Large Synoptic Survey Telescope initiatives. The mission's collaborations strengthened ties among agencies ESA, CNES, DLR, ASI, and NASA and left archival products and software used by research groups at Max Planck Society, Universität Heidelberg, University of Toronto, McGill University, and others.