| Names list | OceanSat-1 IRS-P4 Indian Remote Sensing satellite-P4 |
|---|---|
| Operator | ISRO |
| Cospar id | 1999-029A |
| Satcat | 25756 |
| Website | https://www.isro.gov.in/ |
| Mission duration | 5 years (planned) 11 years (achieved) |
| Spacecraft | OceanSat-1 |
| Spacecraft 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 |
| Launch date | 26 May 1999, 06:22 UTC |
| Launch rocket | Polar Satellite Launch Vehicle, PSLV-C2 |
| Launch site | Satish Dhawan Space Centre, First Launch Pad (FLP) |
| Launch contractor | Indian Space Research Organisation |
| Entered service | August 1999 |
| Deactivated | 8 August 2010 |
| Orbit reference | Geocentric orbit[2] |
| Orbit regime | Sun-synchronous orbit |
| Orbit periapsis | 719 km (447 mi) |
| Orbit apoapsis | 730 km (450 mi) |
| Orbit inclination | 98.4° |
| Orbit period | 99.0 minutes |
| Apsis | gee |
| Instruments | Multi-frequency Scanning microwave radiometer (MSMR) Ocean Colour Monitor (OCM)[3] |
| Programme | Earth observation satellites series |
| Previous mission | IRS-1D |
| Next mission | Oceansat-2 |
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]
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
- ^ "IRS-P4 (Oceansat-1)". Gunter's Space Page. 7 July 2020. Retrieved 13 May 2021.
- ^ "Trajectory: IRS-P4 1999-029A". NASA. 27 April 2021. Retrieved 13 May 2021.
- ^ "Ocean Colour Monitor of IRS-P4 Satellite Tested". ISRO. 3 June 1999. Archived from the original on 22 June 2021. Retrieved 13 May 2021.
- ^ "Oceansat(IRS-P4)". ISRO. 26 May 1999. Retrieved 13 October 2025.
- ^ "IRS-P4 OceanSat". ISRO. Archived from the original on 21 January 2013. Retrieved 13 May 2021.
- ^ Sastry, Hari Ram Subrahmanya; Ebenezer, D. D.; Sundaram, T. V. S. (2002). Proceedings of the International conference on Sonar Sensors of Systems, Vol. 2. Allied Publishers. p. 635. ISBN 978-81-7764-382-4.
- ^ "Display: IRS-P4 1999-029A". NASA. 27 April 2021. Archived from the original on 28 September 2020. Retrieved 13 May 2021.
- ^ Mather, Paul & Magaly Koch (29 December 2010). Computer Processing of Remotely-Sensed Images: An Introduction. John Wiley and Sons. p. 45. ISBN 978-0-470-66650-0.
- ^ Recent Advances In Environmental Science. Discovery Publishing House. 1 January 2003. p. 350. ISBN 978-81-7141-679-0.