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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 was to be replaced by mid 2019 by GSat 30, but the launch of the replacement was delayed to 2020. Insat 4A was sent to a graveyard orbit in october 2019.

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

References:

Further Insat missions: