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Insat 4A, 4B

Insat 4B [ISRO]

INSAT 4A and INSAT 4B are dedicated to telecommunications, with 12 Ku band and 12 C-band transponders each. Their coverage zone is the Indian sub-continent.

Designed, built and integrated by ISRO, the INSAT 4A and INSAT 4B satellites will each weigh about 3,200 kg at liftoff.

INSAT-4 series is planned to have seven satellites, INSAT-4A through INSAT-4G with INSAT-4D as a spare. The transponder capacity of this series has been worked out after evaluating the requirement projected by different uses/user departments. It is planned that, by 2007, INSAT system will have about 250 transponders in various bands catering to a demand of up to 11 Giga Bits Per Second (GBPS) capacity.

Insat 4A is to be replace by mid 2019 by GSat 30.

Nation: India
Type / Application: Communication
Operator: Insat
Contractors: ISRO
Equipment: 12 Ku-band transponders, 12 C-band transponders
Configuration: I-3K (I-3000) Bus
Propulsion: 440 Newton thrust liquid apogee motor
Power: 2 deployable solar arrays, batteries
Lifetime: 12 years
Mass: 3081 kg (#4A); 3028 kg (#4B), 1335 kg (dry)
Orbit: GEO
Satellite COSPAR Date LS Launch Vehicle Remarks
Insat 4A 2005-049A 21.12.2005 Ko ELA-3 Ariane-5GS with MSG 2
Insat 4B 2007-007A 11.03.2007 Ko ELA-3 Ariane-5ECA with Skynet 5A


Further Insat missions: