| Oceansat-1 | |
| Names List: | OceanSat-1 IRS-P4 Indian Remote Sensing satellite-P4 |
| Mission Type: | Earth observation Oceanography |
| 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 |
| Manufacturer: | Indian Space Research Organisation |
| 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 |
| Orbit Regime: | Sun-synchronous orbit |
| Orbit Inclination: | 98.4° |
| Orbit Period: | 99.0 minutes |
| Apsis: | gee |
| Instruments: | Multi-frequency Scanning microwave radiometer (MSMR) Ocean Colour Monitor (OCM) [1] |
| 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.[2]
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).[3] 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, an apogee of, an inclination of 98.4°, and an orbital period of 99.0 minutes.[4]
Oceansat-1 carried two instruments:
Although initially launched with a lifespan of 5 years, Oceansat-1 completed its mission on 8 August 2010, after serving for 11 years.[3]