# EOS-09

> Indian radar imaging satellite, lost in a launch failure

**Wikidata**: [Q134470341](https://www.wikidata.org/wiki/Q134470341)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/EOS-09)  
**Source**: https://4ort.xyz/entity/eos-09

## Summary
EOS-09 was an Indian radar imaging satellite that failed to reach orbit during its launch on May 18, 2025. It was part of India's Radar Imaging Satellite series and used synthetic aperture radar technology for Earth observation.

## Key Facts
- **Instance of**: Synthetic aperture radar satellite, former entity
- **Part of**: Radar Imaging Satellite series
- **Launch date**: May 18, 2025, at 00:29 UTC
- **Launch vehicle**: Polar Satellite Launch Vehicle-XL (PSLV-C61)
- **Launch site**: Satish Dhawan Space Centre First Launch Pad
- **Significant event**: Launch failure on May 18, 2025
- **Aliases**: RISAT-1B, Earth Observation Satellite-09, Radar Imaging Satellite 1B
- **Follows**: EOS-08 and EOS-04, both Indian radar imaging satellites
- **Wikipedia title**: EOS-09
- **Commons category**: EOS-09

## FAQs
### Q: What was EOS-09's purpose?
A: EOS-09 was designed as a synthetic aperture radar satellite for Earth observation, part of India's Radar Imaging Satellite series.

### Q: Why did EOS-09 fail?
A: The satellite was lost during its launch on May 18, 2025, resulting in a launch failure.

### Q: What was the launch vehicle used for EOS-09?
A: The satellite was launched using the Polar Satellite Launch Vehicle-XL (PSLV-C61) from the Satish Dhawan Space Centre First Launch Pad.

### Q: What other satellites preceded EOS-09?
A: EOS-09 followed EOS-08 and EOS-04, both Indian radar imaging satellites.

### Q: What is the Radar Imaging Satellite series?
A: The Radar Imaging Satellite series is an Indian reconnaissance satellite series that includes EOS-09.

## Why It Matters
EOS-09 was part of India's growing Earth observation satellite program, designed to provide radar imaging capabilities for defense, disaster management, and environmental monitoring. Its loss highlights the challenges in space launch reliability, particularly for complex radar imaging satellites. The failure underscores the importance of robust launch systems and backup measures in India's space ambitions.

## Notable For
- **First in series**: EOS-09 was part of India's Radar Imaging Satellite series, which includes reconnaissance and Earth observation satellites.
- **Synthetic aperture radar**: The satellite used advanced radar technology for high-resolution imaging.
- **Launch failure**: The mission marked a setback for India's space program, emphasizing the risks in satellite deployment.
- **Part of ISRO's fleet**: EOS-09 was managed by the Indian Space Research Organisation (ISRO).

## Body
### Overview
EOS-09 was an Indian radar imaging satellite launched on May 18, 2025, aboard the Polar Satellite Launch Vehicle-XL (PSLV-C61). It was part of the Radar Imaging Satellite series, designed for Earth observation using synthetic aperture radar (SAR) technology. The satellite was intended to support defense, disaster management, and environmental monitoring.

### Launch and Failure
The launch occurred at 00:29 UTC from the Satish Dhawan Space Centre First Launch Pad. However, the mission ended in failure, resulting in the loss of the satellite. The failure was attributed to an issue during the launch sequence, highlighting the complexities of deploying radar imaging satellites.

### Series and Precedents
EOS-09 followed EOS-08 and EOS-04, both Indian radar imaging satellites. The Radar Imaging Satellite series is a key component of India's reconnaissance and Earth observation capabilities, managed by the Indian Space Research Organisation (ISRO).

### Technical Specifications
- **Type**: Synthetic aperture radar satellite
- **Series**: Radar Imaging Satellite
- **Launch vehicle**: PSLV-XL (PSLV-C61)
- **Launch site**: Satish Dhawan Space Centre First Launch Pad

## Schema Markup
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  "@type": "Thing",
  "name": "EOS-09",
  "description": "Indian radar imaging satellite lost in a launch failure on May 18, 2025.",
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  "additionalType": "Spacecraft"
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## References

1. [Source](https://nextspaceflight.com/launches/details/7836)
2. Jonathan's Space Report