EOS-09 (RISAT-1B)

Mission

EOS-09 (RISAT-1B) on PSLV XL. Sun 18 May 2025, 00:29 UTC. Reported outcome: Failure. Launch site: Satish Dhawan Space Centre First Launch Pad. Source: Launch Library 2.

RISAT-1B is the third in the series of radar imaging RISAT-1 satellites of ISRO using an active C-band SAR (Synthetic Aperture Radar), providing all-weather as well as the day-and-night SAR observation capability in applications such as agriculture, forestry, soil moisture, geology, sea ice, coastal monitoring, object identification, and flood monitoring, in addition to military surveillance. The RISAT-1 series is developed, manufactured and integrated by ISRO. The 3-axis stabilized spacecraft bus consists of a hexagonal prism shape build around a central cylinder. Most of the spacecraft subsystems and the payload are integrated in the prism structure and the central cylinder. The solar panels and some subsystems are mounted on the cube-shaped section of the spacecraft.

Mission type

Government/Top Secret

Orbit

Sun-Synchronous Orbit

Launch timeline

Times are relative to liftoff.

1. T-3 sSun 18 May, 02:28 CEST

   RCT Ignition

   Ignition of Roll Control Thrusters

2. T-0Sun 18 May, 02:29 CEST

   Ignition

   Start of the engine ignition sequence

3. T+0.42 sSun 18 May, 02:29 CEST

   Booster Ignition

   Ignition of the solid rocket boosters.

4. T+0.62 sSun 18 May, 02:29 CEST

   Booster Ignition

   Ignition of the solid rocket boosters.

5. T+25 sSun 18 May, 02:29 CEST

   Booster Ignition

   Ignition of the solid rocket boosters.

6. T+1 min 9.9 sSun 18 May, 02:30 CEST

   Booster Separation

   The side boosters are separated from the launcher.

7. T+1 min 10.1 sSun 18 May, 02:30 CEST

   Booster Separation

   The side boosters are separated from the launcher.

8. T+1 min 32 sSun 18 May, 02:30 CEST

   Booster Separation

   The side boosters are separated from the launcher.

9. T+1 min 51.64 sSun 18 May, 02:30 CEST

   Stage 2 Separation

   Separation of the second stage from the first

10. T+1 min 51.84 sSun 18 May, 02:30 CEST

    SES

    Start of the second engine

11. T+2 min 32.78 sSun 18 May, 02:31 CEST

    Fairing Separation

    Separation of the payload fairing

12. T+2 min 37.78 sSun 18 May, 02:31 CEST

    CLG Start

    Start of Closed Loop Guidance

13. T+4 min 24.34 sSun 18 May, 02:33 CEST

    Stage 3 Separation

    Separation of the third stage from the second

14. T+4 min 25.54 sSun 18 May, 02:33 CEST

    Stage 3 Ignition

    Third stage engine ignites.

15. T+8 min 13 sSun 18 May, 02:37 CEST

    Kick Stage Separation

    Separation of the kick stage from the previous stage

16. T+8 min 23.4 sSun 18 May, 02:37 CEST

    Kick Stage Ignition

    Start of the kick stage engine

17. T+16 min 52.24 sSun 18 May, 02:45 CEST

    Kick Stage Cut-off

    Cut-off of the kick stage engine

18. T+17 min 39.24 sSun 18 May, 02:46 CEST

    Payload Separation

    Final deployment of the payload from the rocket

19. T+37 min 11.52 sSun 18 May, 03:06 CEST

    Kick Stage Ignition

    Start of the kick stage engine

20. T+45 min 56.78 sSun 18 May, 03:14 CEST

    Kick Stage Cut-off

    Cut-off of the kick stage engine

21. T+1 h 22 min 32.52 sSun 18 May, 03:51 CEST

    Kick Stage Ignition

    Start of the kick stage engine

22. T+1 h 31 min 2.04 sSun 18 May, 04:00 CEST

    Kick Stage Cut-off

    Cut-off of the kick stage engine

23. T+1 h 32 min 52.04 sSun 18 May, 04:01 CEST

    MON Passivation

    Start of Mixed Oxides of Nitrogen passivation

24. T+1 h 41 min 52.04 sSun 18 May, 04:10 CEST

    MMH Passivation

    Start of Monomethylhydrazine passivation

Slip history

Changes recorded by Space Right Now

No changes since we started tracking on Sat 10 Oct 2026, 11:16 UTC.

Launch pad

Satish Dhawan Space Centre First Launch Pad

Satish Dhawan Space Centre, India (IN)

Coordinates: 13.733, 80.235