Planck Explanatory Supplement

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The Explanatory Supplement produced by the Planck Collaboration is a reference text accompanying the public data delivered from the operations of the European Space Agency’s Planck satellite during its mission, and includes descriptions of all the products. The descriptions from the 2013 and 2015 products can be found under Previous Releases at the end of each subsection. Not all the products will be updated in the 2018 release, in which case the description of the product corresponds to the last version. There are three data releases of Planck products:

  • PR1 in 2013 (*.R1.??)
  • PR2 in 2015 (*.R2.??)
  • PR3 in 2018 (*.R3.??)


  1. Introduction
    1. The Planck mission
    2. The spacecraft
    3. Ground segment and Early operations
    4. Survey scanning and Routine operations
    5. Questions and answers
  2. The Instruments
    1. HFI design, qualification, and performance
      1. Cryogenics
      2. Cold optics
      3. Detection chain
      4. Operations
      5. Performance summary
      6. Annexes
    2. LFI design, qualification, and performance
      1. Instrument description
      2. Ground tests
      3. In-flight calibration
      4. Performance summary
      5. Systematic effects
      6. Sorption cooler
      7. Annexes
  3. Data processing
    1. HFI data processing
      1. Pre-processing
      2. TOI processing
      3. Beams
      4. Mapmaking
      5. Spectral response
      6. Systematic effects
      7. Internal overall validation
      8. Summary of HFI data characteristics
      9. HFI simulations
    2. LFI data processing
      1. Pre-processing
      2. TOI processing
      3. Beams
      4. Galactic stray light removal
      5. Mapmaking
      6. Systematic effects uncertainties
      7. Internal overall validation
      8. Summary of LFI data characteristics
    3. HFI/LFI joint data processing
      1. Detector pointing
      2. Compact source catalogues
      3. Astrophysical component separation
      4. CMB power spectra and Planck likelihood code
  4. Planck Legacy Archive: mission products
    1. Timelines and Rings
      1. Timelines
      2. HEALPix rings
    2. Maps
      1. Frequency maps (sky temperature and polarization maps)
      2. CMB maps
      3. Foreground maps
        1. Component maps
          1. Astrophysical components
          2. Astrophysical foregrounds from parametric component separation
          3. CO emission maps
          4. Thermal dust emission (Draine and Li model)
          5. Thermal dust and CIB all-sky maps (GNILC component separation)
        2. Specially processed maps
          1. Lensing map
          2. Compton y-map
          3. Lensing-induced B-mode map
          4. Integrated Sachs-Wolfe effect map
          5. IRAM map of the Crab nebula
      4. Correction maps
      5. Masks
      6. Simulation data
      7. Dates of observations
    3. Catalogues
      1. PCCS
      2. PSZ
      3. PGCC
      4. PHZ
    4. Cosmology
      1. CMB spectrum and likelihood code
      2. Cosmological parameters and MC chains
    5. Beams
      1. Scanning beams
      2. Optical beams
      3. Effective beams
      4. Beam window functions
    6. Instrument model
    7. Planet-related data
    8. Software utilities
      1. Planck Sky Model simulation tool
      2. Mapmaking from timelines and ring tools
      3. FEBeCoP effective beam extraction and convolution tools
      4. Unit conversion and colour correction
      5. Planck value-added tools
      6. SMICA weights propagation code
  5. Operational data
    1. Survey history data
    2. Satellite history data
    3. Planck operational state history
    4. Space radiation environment monitor
  6. Appendix
    1. Glossary
    2. List of acronyms
    3. Product Ingestion Log