PSLV-C61
{{Short description|Failed 2025 Indian satellite launch}}
{{Use dmy dates|date=September 2024}}
The PSLV C-61 was the 63rd flight of the Indian Space Research Organisation's Polar Satellite launch Vehicle and its 27th flight in the -XL configuration.The Mission launched on 18th May 2025 carrying EOS-09 (RISAT 1-B).{{Cite web |title=MSN |url=https://www.msn.com/en-in/news/India/eos-09-satellite-to-boost-india-s-border-monitoring-and-defence-capabilities-launch-scheduled-for-may-18/ar-AA1ExQDq?ocid=BingNewsSerp |access-date=2025-05-14 |website=www.msn.com}}
{{Infobox rocket launch
| name = PSLV-C61
| image = File:PSLV C-61 grand view.webp
| rocket = PSLV-XL
| launch = 18 May 2025 ;5:59 AM IST
(UTC +5:30)
| operator = Indian Space Research Organisation (ISRO)
| pad = Satish Dhawan Space Centre First Launch Pad
| payload = {{Hlist | {{IND}} EOS-09 (RISAT-1B)}}
| outcome = Failure
| succession = PSLV launches
| previous = PSLV-C60
| next = PSLV-C62
}}
Payload
EOS-09, also called RISAT 1-B will be the seventh satellite in ISRO's RISAT series.It is a C-band synthetic aperture radar satellite, enabling it to capture high-resolution images of Earth’s surface regardless of weather conditions, day or night.The satellite features five distinct imaging modes, enabling it to switch between ultra-high-resolution imaging, capable of detecting small objects, and broader scans for large-area observation. The satellite is expected to boost India's space surveillance capabilities and contribute to smarter governance and faster disaster response.It is being launched into a sun-synchronosis orbit amidst tension on the India-Pakistan border.{{Cite web |date=2025-05-08 |title=Isro to launch radar imaging satellite RISAT-1B aboard PSLV-C61 on May 18 |url=https://www.indiatoday.in/science/story/isro-to-launch-radar-imaging-satellite-eos-09-risat-1b-aboard-pslv-c61-on-may-18-2721681-2025-05-08 |access-date=2025-05-14 |website=India Today |language=en}}{{Cite web |last=Nigam |first=Saumya |last2=News |first2=India TV |date=2025-05-12 |title=ISRO's new satellite launch scheduled for June 18 for Defence and Disaster Monitoring |url=https://www.indiatvnews.com/science/isro-s-new-satellite-launch-scheduled-for-june-18-for-defence-and-disaster-monitoring-2025-05-12-989949 |access-date=2025-05-14 |website=India TV News |language=en}}{{Cite web |title=MSN |url=https://www.msn.com/en-in/news/India/what-is-the-earth-imaging-satellite-india-is-launching-amid-tensions-with-pak/ar-AA1EBxM9?ocid=BingNewsVerp |access-date=2025-05-14 |website=www.msn.com}}Orbit Change Thrusters (OCT) were planned to be used to reduce the orbit altitude of the spent PS4 stage to reduce its life in orbit following by stage passivation.[//www.isro.gov.in/media_isro/pdf/PSLVC61/PSLV_C61_EOS_09_Brochure.pdf https://www.isro.gov.in/media_isro/pdf/PSLVC61/PSLV_C61_EOS_09_Brochure.pdf]
Launch Failure
PSLV-C61 launched from SDSC-SHAR at 5:59 AM IST on Sunday 18th May 2025. The First and Second stages performed normally. A failure of the third stage led to mission failure.{{Cite AV media |url=https://www.youtube.com/watch?v=y63x4kjvAc0&ved=2ahUKEwjpgp_T-qqNAxUo1TgGHXjQAn4QwqsBegQIERAE&usg=AOvVaw3pJjTU4LNboN-XF9jIVe1l |title=ISRO’s 101st Launch {{!}} PSLV-C61 / EOS-09 {{!}} 18 May 2025 |date=2025-05-17 |last=ISRO Official |access-date=2025-05-18 |via=YouTube}}{{Cite web |title=EOS-09 mission unsuccessful, will begin technical analysis, says ISRO chief - The Economic Times |url=https://m.economictimes.com/news/science/isro-launches-eos-09-aboard-pslv-c61-boosting-indias-surveillance-and-remote-sensing-powers/amp_articleshow/121243650.cms |access-date=2025-05-18 |website=m.economictimes.com}} Later reports indicated that a drop in chamber pressure of the third stage during its firing led to failure. ISRO's failure analysis committee is expected to release the final failure report within a month.{{Cite web |title=NDTV Explains: Why ISRO's EOS-9 Satellite Launch Failed |url=https://www.ndtv.com/india-news/isro-rocket-launch-failed-due-to-pressure-drop-in-3rd-stage-8442334 |access-date=2025-05-19 |website=www.ndtv.com |language=en}}{{Cite web |last=Jagannathan |first=Venkatachari |title=Consecutive ISRO Mission Failure Raises National Security Concerns |url=https://m.rediff.com/amp/news/report/consecutive-isro-mission-failure-raises-national-security-concerns/20250519.htm |access-date=2025-05-19 |website=Rediff |language=en}}
Mission overview
- Mass:
- Payload weight: 1710 kg
- Overall height: {{cvt|44.4|m}}
- Propellant:
- Stage 1: Composite Solid
- Stage 2: Earth Storable Liquid
- Stage 3: Composite Solid
- Stage 4: Earth Storable Liquid
- Propellant mass:
- Stage 1: {{cvt|139000|kg}}
- Stage 2: {{cvt|41000|kg}}
- Stage 3: {{cvt|7650|kg}}
- Stage 4: {{cvt|1600|kg}}
- Altitude: 529 km
- Maximum velocity:
- Inclination: 97.6°
- Azimuth: 140°
- Period: 95.2 minutes
See also
{{Portal|Spaceflight}}