INSAT-1D
| Mission type | Communications, Cloud Observation |
|---|---|
| Operator | INSAT |
| COSPAR ID | 1990-051A |
| SATCAT no. | 20643 |
| Mission duration | 7 years |
| Spacecraft properties | |
| Spacecraft type | INSAT-1 |
| Manufacturer | Ford Aerospace |
| Launch mass | 1,190 kilograms (2,620 lb) (Lift - off Mass) |
| Dry mass | 550 kilograms (1,210 lb) |
| Power | 1000 W (Solar array); Nominal Power: 1200.0 W |
| Start of mission | |
| Launch date | June 12, 1990, 05:52:00 UTC |
| Rocket | Delta 4925 |
| Launch site | Cape Canaveral LC-17B |
| Contractor | NASA |
| Deployment date | UTC |
| End of mission | |
| Disposal | Decommissioned (mission life over) |
| Deactivated | 14 May 2002 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Geostationary |
| Longitude | 83° east |
| Semi-major axis | 42,164.88 kilometres (26,200.04 mi) |
| Eccentricity | 0.0012393 |
| Perigee altitude | 35,741 kilometres (22,208 mi) |
| Apogee altitude | 35,846 kilometres (22,274 mi) |
| Inclination | 14.30 degrees |
| Period | 23.93 hours |
| Epoch | 14 November 2013, 15:52:38 UTC |
INSAT-1D was 4th and the concluding multipurpose geostationary satellite of the INSAT-1 (first-generation seven-year responsibility for the operation of the INSAT space segment.
But the success of this launch meant a lot to India - a country that was setting up its national computer networks. Relying on a lot of communication circuits, microwave, coaxial, and fibre-optic telecommunication links throughout the country causes a huge problem; and thus the Indian Space Research Organisation (ISRO) planned at the start of the INSAT-1 series to always have at least two satellites in space to meet the increasing demand of telecommunication links for India's civilian community. INSAT-1A and INSAT-1C had already faced immature death and their plans had suffered a serious setback. Another satellite INSAT-1B, launched in 1983, exceeded its planned seven-year working life.