| Names | Indian Remote Sensing satellite-1B |
|---|---|
| Mission type | Earth observation |
| Operator | ISRO |
| COSPAR ID | 1991-061A |
| SATCAT no. | 21688 |
| Website | https://www.isro.gov.in/ |
| Mission duration | 3 years (planned) 10 years (achieved) |
| Spacecraft properties | |
| Spacecraft | IRS-1B |
| Bus | IRS-1 |
| Manufacturer | Indian Space Research Organisation |
| Launch mass | 975 kg (2,150 lb) |
| Dry mass | 895 kg (1,973 lb) |
| Dimensions | 1.56 m x 1.66 m x 1.10 m |
| Power | 600 watts |
| Start of mission | |
| Launch date | 29 August 1991, 06:48:43 UTC |
| Rocket | Vostok-2M s/n I15000-079 |
| Launch site | Baikonur Cosmodrome, Site 31 |
| Contractor | OKB-1 |
| Entered service | November 1991 [1] |
| End of mission | |
| Deactivated | 1 July 2001 [1] |
| Orbital parameters | |
| Reference system | Geocentric orbit[2] |
| Regime | Sun-synchronous orbit |
| Perigee altitude | 859 km (534 mi) |
| Apogee altitude | 915 km (569 mi) |
| Inclination | 99.2° |
| Period | 102.7 minutes |
| Instruments | |
| Linear Imaging Self-Scanning Sensor-1 (LISS-1) Linear Imaging Self-Scanning Sensor-2 (LISS-2) | |
IRS-1B, Indian Remote Sensing satellite-1B, the second of the series of indigenous state-of-art remote sensing satellites, was successfully launched into a polar Sun-synchronous orbit on 29 August 1991 from the Soviet Cosmodrome at Baikonur. IRS-1B carries two sensors, LISS-1 and LISS-2, with resolutions of 72 m (236 ft) and 36 m (118 ft) respectively with a swath width of about 140 km (87 mi) during each pass over the country. It was a part-operational, part-experimental mission to develop Indian expertise in satellite imagery. It was a successor to the remote sensing mission IRS-1A, both undertaken by the Indian Space Research Organisation (ISRO).[3]