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Department of Space, Indian Space Research Organisation


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Mar 12, 2007


INSAT-4BINSAT–4B Spacecraft is the second in the INSAT 4 series of spacecrafts and is configured with exclusive communication payloads to provide services in Ku and C frequency bands. This is co-located with INSAT–3A at 93.5 o E longitude.
Mission Communication
Weight 3025 kg (at Lift – off)
Onboard Power 5859 W
It uses 3 earth sensors, 2 digital sun sensors, 8 coarse analog sun sensors, 3 solar panel sun sensors and one sensor processing electronics. The wheels and wheel drive electronics were imported with indigenous wheel interface module to interface the wheel drive electronics and AOCE.
The propulsion system is employing 16 thrusters, 4 each located on east, west and AY sides and 2 each on north and south sides. There is one 440 N liquid apogee motor (using Mono Methyl Hydrazine (MMH) as fuel and oxides of Nitrogen (MON3 as oxidizer) and three pressurant tanks mounted on the LAM deck.
12 Ku band high power transponders covering Indian main land using 140W radiatively cooled TWTAs.
12 C band high power transponders with extended coverage, covering southeast and northwest region apart from Indian main land using 63 W TWTAs
Launch date  March 12, 2007
Launch Site French Guiana
Launch Vehicle  Ariane5
Orbit Geostationary (93.5o E Longitude)
Mission Life  12 Years


प्रमोचन भार / Launch Mass: 
3025 Kg
मिशन कालावधि / Mission Life : 
12 Years
शक्ति / Power: 
5859 W
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निर्माता / Manufacturer: 
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कक्षा का प्रकार / Orbit Type: