Oceansat(IRS-P4) Satellite

IRS-P4 (OCEANSAT) is the first satellite primarily built for Ocean applications, weighing 1050 kg placed in a Polar Sun Synchronous orbit of 720 km, launched by PSLV-C2 from SHAR Centre, Sriharikota on May 26, 1999.

This satellite carries Ocean Colour Monitor (OCM) and a Multi - frequency Scanning Microwave Radiometer (MSMR) for oceanographic studies. IRS-P4 thus vastly augment the IRS satellite system of ISRO comprising four satellites, IRS-1B, IRS-1C, IRS-P3 and IRS-1D and extend remote sensing applications to several newer areas.

Mission completed on August 8, 2010 after serving for 11 years and 2 months.
 
Launch dateMay 26, 1999
Launch siteSHAR, Sriharikota
Launch vehiclePSLV - C2
OrbitPolar Sun Synchronous
Altitude720 km
Inclination98.28 deg
Period99.31 min
Local time of Eq. crossing12 noon
Repetitivity cycle2 days
Size2.8m x 1.98m x 2.57m
Mass at lift off1050 kg
Length when fully deployed11.67 m
Attitude and Orbit Control3-axis body-stabilised using Reaction Wheels, Magnetic Torquers and Hydrazine Thrusters
Power9.6 Sq.m Solar Array generating 750w Two 21 Ah Ni-Cd Batteries
Mission Completed OnAugust 8, 2010

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