अप्रैल 26, 2012
PSLV-C19/RISAT-1
The Polar Satellite Launch Vehicle, in its 21st flight (PSLV-C19), launches India’s first Radar Imaging Satellite – RISAT-1 into a Polar Circular Orbit with an altitude of 480 km (+ 40.5 km) and orbital inclination of 97.552 (+ 0.2). RISAT-1 weighing 1858 kg is the heaviest satellite being launched by PSLV.
This is the third flight of the high end version (PSLV-XL) with six extended strap-on motors, each carrying 12 tonnes of solid propellant. (The two earlier flights of PSLV-XL were used to launch Chandrayaan-1 and GSAT-12 Communication Satellite)
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PSLV- C19 Stages at a Glance
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| STAGE-1 | STAGE-2 | STAGE-3 | STAGE-4 | |
| Nomenclature | Core Stage (PS1) + 6 Strap-on Motors | PS2 | PS3 | PS4 |
| Propellant | Solid (HTPB Based) |
Liquid (UH25 + N2O4) |
Solid (HTPB Based) |
Liquid (MMH + MON-3) |
| Mass (Tonne) | 138.0 (Core), 6 x 12.0 (Strap-on) | 41.7 | 7.6 | 2.5 |
| Max Thrust (kN) | 4819 (Core), 6 x 716 (Strap-on) |
804 | 240 | 7.3 X 2 |
| Burn Time (sec) | 101.5 (Core), 49.5 (Strap-on) |
149 | 112.1 | 523 |
| Stage Dia (m) | 2.8 (Core), 1.0 (Strap-on) |
2.8 | 2.0 | 2.8 |
| Stage Length (m) | 20 (Core) 14.7 (Strap-on) |
12.8 | 3.6 | 2.6 |