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Indian Earth observation satellite From Wikipedia, the free encyclopedia
RISAT-2BR1 is a synthetic-aperture radar (SAR) imaging satellite built by Indian Space Research Organisation (ISRO). It is part of India's RISAT series of SAR imaging satellite and fourth satellite in the series. RISAT-2BR1 was launched on 11 December 2019 at 09:55 UTC aboard Polar Satellite Launch Vehicle PSLV-C48 from First Launch Pad (FLP) of Satish Dhawan Space Centre.[3][4] It was the 50th launch of Polar Satellite Launch Vehicle and 75th launch from Satish Dhawan Space Centre.[5][6]
RISAT-2BR1 with its "Radial Rib Antenna" in deployed configuration. | |
| Names | Radar Imaging Satellite-2BR1 |
|---|---|
| Mission type | Earth observation Radar imaging satellite |
| Operator | ISRO |
| COSPAR ID | 2019-089F |
| SATCAT no. | 44857 |
| Website | https://www.isro.gov.in/ |
| Mission duration | 5 years (planned) 5 years, 1 month and 13 days (in progress) |
| Spacecraft properties | |
| Spacecraft | RISAR-2BR1 |
| Bus | RISAT |
| Manufacturer | Indian Space Research Organisation |
| Launch mass | 615 kg (1,356 lb) [1][2] |
| Power | 2 kW |
| Start of mission | |
| Launch date | 11 December 2019, 09:55 UTC |
| Rocket | Polar Satellite Launch Vehicle, PSLV-C48 |
| Launch site | Satish Dhawan Space Centre, First Launch Pad (FLP) |
| Contractor | Indian Space Research Organisation |
| Entered service | March 2020 |
| Orbital parameters | |
| Reference system | Geocentric orbit |
| Regime | Low Earth orbit |
| Perigee altitude | 555 km (345 mi) |
| Apogee altitude | 555 km (345 mi) |
| Inclination | 37.0° |
| Period | 90.0 minutes |
| Instruments | |
| Synthetic Aperture Radar (X-band) (SAR-X) | |
The RISAT-2BR1 is follow on to RISAT-2B and has an X-band SAR with unfurlable radial rib reflector antenna of 3.6 meter diameter.[7] RISAT-2BR1 can operate in different modes including Very High Resolution imaging modes of 1 x 0.5 m resolution and 0.5 x 0.3 m resolution [8] with swath of 5 to 10 km.[9]
RISAT-2BR1 was launched aboard PSLV-C48 on 11 December 2019 at 09:55 UTC with nine other ride-sharing commercial satellites from First Launch Pad of Satish Dhawan Space Centre, SHAR. Launch vehicle used was -QL variant of Polar Satellite Launch Vehicle with four PSOM-XL strap-ons and employed a 195 kg Dual Launch Adapter (DLA) to accommodate primary and secondary payloads. After a flight of 16 minutes 27 seconds, RISAT-2BR1 was separated from PSLV fourth stage (PS4) and injected into 576 km circular orbit with 37.0° inclination. After primary payload, DLA and subsequently nine other co-passenger satellites were separated. RISAT-2BR1 deployed it solar panels within 3 minutes after separation and deployed its 3.6 meter antenna on 08:30 UTC, on 12 December 2019.[11][3]
Nine commercial ridesharing satellites weighed 157.6 kg cumulatively.[2][12]
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