Article · Wikipedia archive · Last revised Jul 24, 2026

EOS-09

EOS-09 or Earth Observation Satellite-09 was an Indian Space Research Organisation radar imaging satellite designed to provide continuous and reliable remote sensing data for operational applications across various sectors. It was intended to be a follow on to RISAT-1 satellite with similar configuration. The satellite was developed by the ISRO and was the seventh in the series of RISAT satellites.

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EOS-09
EOS-9 during Integration
NamesRadar Imaging Satellite-1B
Mission typeImaging radar
OperatorISRO
WebsiteISRO PSLV-C61 / EOS-09 Mission
Mission duration5 years (planned)
Failed to orbit
Spacecraft properties
SpacecraftEOS-09
ManufacturerISRO
Start of mission
Launch date18 May 2025, 05:59 IST
RocketPSLV-C61
Launch siteSatish Dhawan Space Centre, First Launch Pad (FLP)
ContractorISRO
Orbital parameters
Reference systemGeocentric orbit1
RegimeSun-synchronous orbit
Perigee altitude526.7 km (327.3 mi) (planned)
Apogee altitude543.4 km (337.7 mi) (planned)
Inclination97.6°
Period95.2 minutes
Instruments
Synthetic Aperture Radar (C-band) (SAR-C)

EOS-09 or Earth Observation Satellite-09 (formerly known as RISAT-1B) was an Indian Space Research Organisation radar imaging satellite designed to provide continuous and reliable remote sensing data for operational applications across various sectors.2 It was intended to be a follow on to RISAT-1 satellite with similar configuration. The satellite was developed by the ISRO and was the seventh in the series of RISAT satellites.345

Satellite description

Synthetic Aperture Radar (SAR) can be used for Earth observation irrespective of the light and weather conditions of the area being imaged.6 It complements/supplements data from Resourcesat, Cartosat and RISAT-2B Series.7 The satellite carries a C-band synthetic-aperture radar (SAR) and has a liftoff mass of 1,710 kg (3,770 lb).1 The EOS-09 orbit is expected to be in a polar and Sun-synchronous orbit (SSO) at 05:30 AM LTDN, at approximate altitude of 529 km.8

Launch Failure

The PSLV-C61 mission launched EOS-9 on 18 May 2025 at 5:59 AM IST. The first and second stages performed nominally, however, the third stage experienced an anomaly which resulted in loss of mission. ISRO is investigating the failure.910

See also

See also

References

References

  1. "PSLV-C52/EOS-04 Mission". ISRO. Archived from the original on 9 February 2022. Retrieved 9 February 2022.
  2. "EOS-09". ISRO. Archived from the original on 16 May 2025. Retrieved 18 May 2025.
  3. Krebs, Gunter (8 October 2021). "RISAT 1, 1A, 1B (EOS 04)". Gunter's Space Page. Archived from the original on 26 December 2021. Retrieved 26 December 2021.
  4. "Unstarred Question No. 4702" (PDF). Lok Sabha. National Informatics Centre. 29 March 2023. Archived from the original (PDF) on 29 March 2023. Retrieved 12 April 2023.
  5. "Mission Summary - RISAT-1B". CEOS. 2021. Archived from the original on 26 December 2021. Retrieved 26 December 2021.
  6. Raj, N. Gopal (25 April 2012). "RISAT-1's radar can see through clouds and work in darkness". The Hindu. Chennai, India.
  7. "PSLV-C52/EOS-04 Brochure - ISRO". www.isro.gov.in. Archived from the original on 9 February 2022. Retrieved 17 February 2022.
  8. Reddy, O.V. Raghav (3 February 2016). "Future Earth Observation Missions of ISRO, NRSC User Interaction Meet 2016" (PDF). Archived from the original (PDF) on 3 February 2017.
  9. "EOS-09 mission unsuccessful, will begin technical analysis, says ISRO chief - The Economic Times". m.economictimes.com. Retrieved 18 May 2025.
  10. ISRO Official (17 May 2025). ISRO's 101st Launch | PSLV-C61 / EOS-09 | 18 May 2025. Retrieved 18 May 2025 – via YouTube.