Engineering:EOS-09

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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 orbit[1]
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-08
 
← EOS-04
RISAT-2A →

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.[3][4][5]

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.[9][10]

See also

References

  1. ↑ 1.0 1.1 "PSLV-C52/EOS-04 Mission". ISRO. https://www.isro.gov.in/launcher/pslv-c52-eos-04-mission. 
  2. ↑ "EOS-09". ISRO. https://www.isro.gov.in/Mission_PSLV_C61_EOS_09.html. 
  3. ↑ Krebs, Gunter (8 October 2021). "RISAT 1, 1A, 1B (EOS 04)". Gunter's Space Page. https://space.skyrocket.de/doc_sdat/risat-1.htm. 
  4. ↑ "Unstarred Question No. 4702". Lok Sabha. National Informatics Centre. 29 March 2023. https://pqals.nic.in/annex/1711/AU4702.pdf. 
  5. ↑ "Mission Summary - RISAT-1B". CEOS. 2021. http://database.eohandbook.com/database/missionsummary.aspx?missionID=865. 
  6. ↑ Raj, N. Gopal (25 April 2012). "RISAT-1's radar can see through clouds and work in darkness". The Hindu (Chennai, India). http://www.thehindu.com/sci-tech/technology/article3350204.ece. 
  7. ↑ "PSLV-C52/EOS-04 Brochure - ISRO". https://www.isro.gov.in/pslv-c52-eos-04-mission/pslv-c52-eos-04-brochure. 
  8. ↑ Reddy, O.V. Raghav (3 February 2016). "Future Earth Observation Missions of ISRO, NRSC User Interaction Meet 2016". http://nrsc.gov.in/sites/all/pdf/modnrscUIM%20_Raghava%20Reddy_1.pdf. 
  9. ↑ "EOS-09 mission unsuccessful, will begin technical analysis, says ISRO chief - The Economic Times". https://m.economictimes.com/news/science/isro-launches-eos-09-aboard-pslv-c61-boosting-indias-surveillance-and-remote-sensing-powers/articleshow/121243650.cms. 
  10. ↑ ISRO Official (2025-05-17). ISRO's 101st Launch | PSLV-C61 / EOS-09 | 18 May 2025. Retrieved 2025-05-18 – via YouTube.

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