Launch Date:21.03.1996


IRS-P3 was an experimental Earth Observation mission, successfully orbited onboard by the third developmental flight of PSLV. IRS-P3 carried two remote sensing payloads – Wide Field Sensor (WiFS) similar to that of IRC-1C but with an additional spectral band in the Short Infrared region and a Modular Opto-electronic Scanner (MOS), imaging push-broom spectrometer for VNIR/SWIR observations, provided by DLR, Germany. It also carries an X-ray astronomy payload and a C-band transponder for radar calibration. Attitude and Orbit Control System supported Nadir mode for WiFS and MOS payloads and Stellar mode for X-ray payloads.

Mission Experimental Remote Sensing
Orbit 817 km Polar Sun-Synchronous
Orbit Inclination 98.7o
Lift-off Mass 920 kg
Orbit Period 101.35 minutes
Local Time of Equator crossing 10:30 A.M.
Repetitivity 24 days

WiFS: 188 m resolution, 770 km swath, 7 bit radiometry, 3 Bands (Band 3: 0.62-0.68 µm; Band 4: 0.77-0.86 µm; Band 5 :1.55-1.75 µm)

Modular Opto-electronic Scanner for

MOS-A: 1.57 km x 1.4 km, Swath 195 km, 755-768 nm, 4 channels, 16 bits – for atmospheric studies

MOS-B: 0.52 km x 0.52 km, Swath 200 km, 408-1010 nm, 13 channels, 16 bits – for ocean and coastal zone parameters.

MOS-C: 0.52 km x 0.64 km, Swath 192 km, SWIR (1 channel), 16 bits – cloud/snow/ice discrimination, sea surface roughness, etc.

Indian X-Ray Astronomy Experiments (IXAE), C-Band Transponder

Attitude and Orbit Control 3-axis body stabilized with 4 reaction wheels and magnetic torquers
Power Solar Array generating 870 W backed by 2 Ni-Cd batteries of 24 AH capacities each
Launch date March 21, 1996
Launch site SHAR Centre, Sriharikota, India
Launch vehicle PSLV – D3
Mission life One Year (Nominal)
Orbital life Completed on 1997