IRS 1A [ISRO]
IRS 1A and 1B (Indian Remote Sensing Satellite) were the first of the series of indigenous state-of-art remote sensing satellites.
IRS-1A, was successfully launched into a polar sun-synchronous orbit on 17 March 1988 from the Soviet Cosmodrome at Baikonur on a Vostok-2M booster. IRS-1A carried two cameras, LISS-I and LISS-II with resolutions of 73 meters and 36.25 meters respectively with a swath width of about 140 km during each pass over the country. Its mission was completed during July 1996 after serving for 8 years and 4 months.
IRS-1B was launched on 29 August 1991 also on a Vostok-2M booster. It had some improved features compared to its predecessor: gyro referencing for better orientation sensing, time tagged commanding facility for more flexilibility in camera operation and line count information for better data product generation. The missiion of IRS-1B ended on 20 December 2003 after serving for 12 years and 4 months.
An engineering model was later modified into the IRS 1E satellite.
|Type / Application:||Earth observation|
|Power:||2 deployable solar arrays, batteries|
|Mass:||975 kg (#1A); 980 kg (#!B)|
|Orbit:||894 km × 912 km, 98.8° (#1A); 890 km × 917 km, 99.1°|
|IRS 1A||1988-021A||17.03.1988||Ba LC-31/6||Vostok-2M|
|IRS 1B||1991-061A||29.08.1991||Ba LC-31/6||Vostok-2M|