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IRS P4 (Indian Remote Sensor P4), also known as Oceansat 1, was an remote sensing satellite that was placed into a Sun-synchronous orbit. The satellite carried an OCM (Ocean Color Monitor) and a MSMR (Multi-frequency Scanning Microwave Radiometer) instrument. OCM will monitor globally potential fishery zones, ocean currents, and pollution and sediment inputs in the coastal zones. It operates on eight wavelength bands, providing data with a swath width of 1,420 km and at a resolution of 350 meters. MSMR will monitor at 6.6 GHz sea surface temperature, wind speed, cloud vapor/water content.

Alternate Names

  • 25756
  • IRSP4
  • Indian Remote Sensing Satellite P4
  • Oceansat 1

Facts in Brief

Launch Date: 1999-05-26
Launch Vehicle: PSLV
Launch Site: Sriharikota, India
Mass: 1050 kg

Funding Agency

  • Indian Space Research Organization (India)


  • Earth Science

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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