INSAT-4B
| 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 UTC |
| 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 |
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.
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.
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. 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. It received the International Designator 2007-007A and Satellite Catalog Number 30793. 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.
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