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Oceansat-1 or IRS-P4 was the first Indian satellite built primarily for ocean applications. It was a part of the Indian Remote Sensing Programme satellite series. The satellite carried an Ocean Colour Monitor (OCM) and a Multi-frequency Scanning Microwave Radiometer (MSMR) for oceanographic studies. Oceansat-1 thus vastly augment the IRS satellite system of Indian Space Research Organisation (ISRO) comprising four satellites, IRS-1B, IRS-1C, IRS-P3 and IRS-1D and extend remote sensing applications to several newer areas.[4]

Oceansat-1

Names	OceanSat-1 IRS-P4 Indian Remote Sensing satellite-P4
Mission type	Earth observation Oceanography
Operator	ISRO
COSPAR ID	1999-029A
SATCAT no.	25756
Website	https://www.isro.gov.in/
Mission duration	5 years (planned) 11 years (achieved)
Spacecraft properties
Spacecraft	OceanSat-1
Bus	IRS-1A[1]
Manufacturer	Indian Space Research Organisation
Launch mass	1,050 kg (2,310 lb)
Dimensions	2.80 m x 1.98 m x 2.57 m
Power	750 watts
Start of mission
Launch date	26 May 1999, 06:22 UTC
Rocket	Polar Satellite Launch Vehicle, PSLV-C2
Launch site	Satish Dhawan Space Centre, First Launch Pad (FLP)
Contractor	Indian Space Research Organisation
Entered service	August 1999
End of mission
Deactivated	8 August 2010
Orbital parameters
Reference system	Geocentric orbit[2]
Regime	Sun-synchronous orbit
Perigee altitude	719 km (447 mi)
Apogee altitude	730 km (450 mi)
Inclination	98.4°
Period	99.0 minutes
Instruments
Multi-frequency Scanning microwave radiometer (MSMR) Ocean Colour Monitor (OCM) [3]
Earth observation satellites series ← IRS-1D Oceansat-2 →

Launch

Oceansat-1 was launched by the Indian Space Research Organisation's PSLV-C2 along with the DLR-Tubsat of Germany and Kitsat-3 of South Korea on 26 May 1999 from the Satish Dhawan Space Centre First Launch Pad of Satish Dhawan Space Centre in Sriharikota, India. It was the third successful launch of Polar Satellite Launch Vehicle (PSLV).[5] It was the 8th satellite of the Indian Remote Sensing Programme (IRS) satellite series of India. Oceansat-1 was operated in a Sun-synchronous orbit. On 26 May 1999, it had a perigee of 719 km (447 mi), an apogee of 730 km (450 mi), an inclination of 98.4°, and an orbital period of 99.0 minutes.[2]

Instruments

Oceansat-1 carried two instruments:

• Multi-frequency Scanning Microwave Radiometer (MSMR), collects data by measuring microwave radiation passing through the atmosphere over the ocean.[6] This offers information including sea surface temperature, wind speed, cloud water content, and water vapour content.[1][6] MSMR monitor at 6.6 GHz.[7]
• Ocean Colour Monitor (OCM), is a solid state camera literally designed primarily to monitor the colour of the ocean,[8] thereby useful for documenting chlorophyll concentration, phytoplankton blooms, atmospheric aerosols and particulate matter.[1] It is capable of detecting eight spectrums ranging from 400 nm to 885 nm, all in the visible or near infrared spectrums.[9] OCM 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 1420 km and at a resolution of 350 metres.[7]

Mission

Although initially launched with a lifespan of 5 years, Oceansat-1 completed its mission on 8 August 2010, after serving for 11 years.[5]

References

External links

• Indian Space Research Organisation: IRS-P4

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