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Indian Space Research OrganizationPSLV XLSatish Dhawan Space Centre First Launch Pad, Satish Dhawan Space Centre, India

EOS-09 (RISAT-1B)

Launched

May 18, 2025 · 00:29 UTC

Launch Failure

Summary

EOS-09 (RISAT-1B) launched on an Indian Space Research Organization PSLV XL from Satish Dhawan Space Centre First Launch Pad, Satish Dhawan Space Centre, India on May 18, 2025 at 00:29 UTC. The mission failed: 3rd stage failure during burn. The launch window ran from 00:00 to 04:00 UTC. It was Indian Space Research Organization's 95th launch, 2nd this year and humanity's 6,957th orbital launch attempt. It was the 27th PSLV XL flight and the 1st this year. The payload was bound for Sun-Synchronous Orbit (SSO).

Result
3rd stage failure during burn.
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Vehicle
PSLV XL · Indian Space Research Organization
Booster
No booster details on record.
Mission
Government/Top Secret · Sun-Synchronous Orbit (SSO)
Milestone
27th PSLV XL flight · 1st this yearIndian Space Research Organization's 95th launch2nd this yearhumanity's 6,957th orbital launch attempt108th orbital launch attempt this year

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Flight preview

Flight timeline

24 steps, T−3 s to T+1 h 41 min
  1. T−3SRCT Ignition
  2. T−0Ignition
  3. T+0.42SBooster Ignition
  4. T+0.62SBooster Ignition
  5. T+25SBooster Ignition
  6. T+1M9.9SBooster Separation
  7. T+1M10.1SBooster Separation
  8. T+1M32SBooster Separation
  9. T+1M51.64SStage 2 Separation
  10. T+1M51.84SSES
  11. T+2M32.78SFairing Separation
  12. T+2M37.78SCLG Start
  13. T+4M24.34SStage 3 Separation
  14. T+4M25.54SStage 3 Ignition
  15. T+8M13SKick Stage Separation
  16. T+8M23.4SKick Stage Ignition
  17. T+16M52.24SKick Stage Cut-off
  18. T+17M39.24SPayload Separation
  19. T+37M11.52SKick Stage Ignition
  20. T+45M56.78SKick Stage Cut-off
  21. T+1H22M32.52SKick Stage Ignition
  22. T+1H31M2.04SKick Stage Cut-off
  23. T+1H32M52.04SMON Passivation
  24. T+1H41M52.04SMMH Passivation

About this launch

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.

Official page: www.isro.gov.inOfficial page: PSLV-C61 / EOS-09 Mission

Pad

Map of Satish Dhawan Space Centre First Launch Pad

Satish Dhawan Space Centre First Launch Pad, Satish Dhawan Space Centre, India

62nd launch from Satish Dhawan Space Centre First Launch Pad, 1st this year · 99th from Satish Dhawan Space Centre, India

Local pad time at liftoff: May 18, 5:59 AM GMT+5:30, in daylight

64 launches from this pad · 105 from Satish Dhawan Space Centre, India

138 days after the previous launch from this pad

All launches from Satish Dhawan Space Centre, IndiaOpen in maps

Updates

Launch failure.

Cosmic_Penguin · May 18, 2025 · source

Show 7 earlier updates

  • Liftoff.

    Cosmic_Penguin · 5/18/2025 · source

  • Official Webcast by ISRO Official has started

    LL2 · 5/18/2025 · source

  • Adjusted T-0.

    Cosmic_Penguin · 5/15/2025 · source

  • Added launch time.

    Cosmic_Penguin · 5/8/2025 · source

  • Added launch window, NET May 18.

    Cosmic_Penguin · 5/1/2025 · source

  • NET May 19.

    Cosmic_Penguin · 4/29/2025 · source

  • Added launch.

    Cosmic_Penguin · 4/18/2025 · source

Questions

When did EOS-09 (RISAT-1B) launch?

EOS-09 (RISAT-1B) launched on May 18, 2025 at 00:29 UTC. The launch window ran from 00:00 to 04:00 UTC.

Why did EOS-09 (RISAT-1B) fail?

3rd stage failure during burn.

Where can I watch EOS-09 (RISAT-1B)?

Coverage: ISRO’s 101st Launch | PSLV-C61 / EOS-09 | 18 May 2025. Watch the replay

What rocket launched EOS-09 (RISAT-1B)?

PSLV XL, flown by Indian Space Research Organization. PSLV XL spec sheet

Where did EOS-09 (RISAT-1B) launch from?

Satish Dhawan Space Centre First Launch Pad, Satish Dhawan Space Centre, India. Liftoff was May 18, 5:59 AM GMT+5:30 local time at the pad.

What orbit was EOS-09 (RISAT-1B) going to?

Sun-Synchronous Orbit (SSO), a government/top secret mission.