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Sentinel-5 Precursor

Template:Infobox spacecraft class Sentinel-5 Precursor is an Earth observation satellite developed by the ESA as part of the Copernicus Programme to close the gap in continuity of observations between Envisat and Sentinel-5.[1]


Sentinel-5 Precursor will be the first mission of a Copernicus Programme dedicated to monitoring air pollution. It's instrument will be ultraviolet, visible, near and short-wavelength infrared spectrometer called Tropomi. Satellite is build on a hexagonal Astrobus L 250 satellite bus equipped in S- and X-band communication antennas, three foldable solar panels generating 1500W and a hydrazine thrusters for station-keeping.[2][3]

Once launched satellite will be put on 824 km Sun-synchronous orbit with a period of 13:30 hours.


Tropomi (TROPOspheric Monitoring Instrument) will be a spectrometer sensing ultraviolet (UV), visible (VIS), near (NIR) and short-wavelength infrared (SWIR) to monitor ozone, methane, formaldehyde, aerosol, carbon monoxide, NO2 and SO2 in the atmosphere extending the capabilities of OMI from Aura satellite and SCIAMACHY instrument from Envisat.[4]

Instrument will be taking measurements every second covering an area of approximately 2600km wide and 7km long in a resolution of 7x7km. Light will be separated into a different wavelengths using grating spectrometers and then measured with four different detectors for respective spectral bands. UV spectrometer is going to work in spectral range of 270-320nm, visible light spectrometer in 310-500nm, NIR in 675-775nm and SWIR in 2305-2385nm.[5]

Instrument is split into four major blocks: UV-VIS-NIR spectrometers and a calibration block, SWIR spectrometer with its optics, instrument control unit and a cooling block. Total mass of Tropomi will be 200kg with a power consumption of 170W on average and a data output of 140 Gbits per orbit.[5][2]

Instrument is being build by a joint venture between the Netherlands Space Office, Royal Netherlands Meteorological Institute, Netherlands Institute for Space Research, Netherlands Organisation for Applied Scientific Research and Airbus Defence and Space Netherlands.[6][7]


First large contract for Sentinel-5P was signed in July 2009 for Tropomi instrument between the European Space Agency and Dutch Ministry of Economic Affairs which contributed €78 million.[6] On 8 December 2011 ESA selected Astrium UK as a prime contractor for the satellite, signing contract worth €45.5 million[8] Construction of the satellite itself was completed in May 2014, however it still awaits for its primary instrument.[9]

Satellite will be launched by Eurockot Launch Services onboard Rokot in 2016.[10]


  1. ^ "Sentinels -4/-5 and -5P". ESA. Retrieved 6 September 2014. 
  2. ^ Cite error: The named reference DataSheet was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference eoPortal was invoked but never defined (see the help page).
  4. ^ "TROPOMI". Retrieved 6 September 2014. 
  5. ^ a b "TROPOMI: Instrument". Retrieved 6 September 2014. 
  6. ^ a b "Agreement between the Netherlands and ESA signed for Sentinel-5 Precursor instrument". ESA. 6 July 2009. Retrieved 6 September 2014. 
  7. ^ "Sentinel 5-Precursor/TROPOMI". Netherlands Institute for Space Research. Retrieved 6 September 2014. 
  8. ^ "ESA selects Astrium to build Sentinel-5 Precursor satellite". ESA. 8 December 2011. Retrieved 6 September 2014. 
  9. ^ "Platform brings air monitoring a step closer". ESA. 27 May 2014. Retrieved 6 September 2014. 
  10. ^ "ESA books Eurockot Launch for Sentinel-5p Satellite". Eurockot Launch Services. 29 January 2014. Retrieved 6 September 2014. 

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