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Insat 4C, 4CR

Insat 4C [ISRO]

INSAT-4C is an exclusive Ku-band satellite with 12 high power Ku-band transponders providing India coverage. Launch of INSAT-4C by GSLV is planned in 2006. During the year, INSAT-4C bus and payload configuration was finalised and comprehensive design review completed for bus and payload systems. Layout of equipment panels has been finalised. Mechanical packages are under integration. Payload Integration has been taken up. Spacecraft structure has been fabricated and all flight propulsion hardware realised. Hardware-in-loop simulation was carried out. Solar panel substrates have been realised and solar cell bonding is in progress. Test and evaluation of power packages is in progress.

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.

The Insat 4C satellite failed to reach orbit due to a launch vehicle malfunction. Shortly after the failure, ISRO announced, that they plan to launch an identical satellite by July 2007.

The replacement satellite Insat 4CR was launched on 2 September 2007, but the reached orbit was lower than planned. Insat-4CR has enough fuel to reach an operational geo-stationary orbit on its own, but the available service life was reduced by 5 years. It is to be replaced by December 2018 by GSat 31. In November 2020, it was placed into a graveyard orbit.

Nation: India
Type / Application: Communication
Operator: Insat
Contractors: ISRO
Equipment: 12 Ku-band transponders
Configuration: I-2K (I-2000) Bus
Propulsion: 440 Newton thrust liquid apogee motor
Power: 2 deployable solar arrays, batteries
Lifetime: 10 years
Mass: 2168 kg (950 kg dry)
Orbit: GEO
Satellite COSPAR Date LS Launch Vehicle Remarks
Insat 4C 2006-F02 10.07.2006 Sr SLP F GSLV Mk.1(2)
Insat 4CR 2007-037A 02.09.2007 Sr SLP GSLV Mk.1(2)


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