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Mission type Communications
Operator ISRO
COSPAR ID 2007-007A
SATCAT no. 30793
Mission duration 12 years
Spacecraft properties
Bus I-3K
Manufacturer ISRO
Launch mass 3,028 kilograms (6,676 lb)
Dry mass 1,335 kilograms (2,943 lb)
Start of mission
Launch date 11 March 2007, 22:03 (2007-03-11UTC22:03Z) UTC[1]
Rocket Ariane 5ECA
Launch site Kourou ELA-3
Contractor Arianespace
Orbital parameters
Reference system Geocentric
Regime Geostationary
Longitude 93.48° east
Semi-major axis 42,163.57 kilometres (26,199.23 mi)
Eccentricity 0.0003909
Perigee 35,776 kilometres (22,230 mi)
Apogee 35,809 kilometres (22,251 mi)
Inclination 0.07 degrees
Period 23.93 hours
Epoch 11 November 2013, 22:16:22 UTC[2]

INSAT-4B is an Indian communications satellite which forms part of the Indian National Satellite System. Launched in 2007, it is operated in geostationary orbit at a longitude of 93.48° east.[3]

Built by the Indian Space Research Organisation, INSAT-4B is based upon the I-3K satellite bus. It had a mass at launch of 3,028 kilograms (6,676 lb), with a dry mass of 1,335 kilograms (2,943 lb) and was expected to operate for twelve years. Two solar arrays power the satellite, while its communications payload consists of twelve C and twelve Ku band transponders.[4]

Arianespace was contracted to launch INSAT-4B using an Ariane 5ECA carrier rocket. The launch occurred on 11 March 2007 at 22:03 UTC, from ELA-3 at Kourou.[1] The Skynet 5A military communications satellite for the British Ministry of Defence was launched aboard the same rocket.

INSAT-4B was successfully inserted into geosynchronous transfer orbit, from which it raised itself into geostationary orbit using a liquid-fuelled apogee motor.[4] It received the International Designator 2007-007A and Satellite Catalog Number 30793.[5] As of 11 November 2013, it is in an orbit with a perigee of 35,776 kilometres (22,230 mi), an apogee of 35,809 kilometres (22,251 mi), inclination of 0.07 degrees and an orbital period of 23.93 hours.[2]


  1. ^ a b McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 12 November 2013. 
  2. ^ a b "INSAT 4B Satellite details 2007-007A NORAD 30793". N2YO. 11 November 2013. Retrieved 12 November 2013. 
  3. ^ "UCS Satellite Database". Union of Concerned Scientists. 1 September 2013. Retrieved 12 November 2013. 
  4. ^ a b Krebs, Gunter. "Insat 4A, 4B". Gunter's Space Page. Retrieved 12 November 2013. 
  5. ^ McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 12 November 2013.