# Michibiki 5

> Japanese navigation satellite, lost in a launch failure in 2025

**Wikidata**: [Q137353655](https://www.wikidata.org/wiki/Q137353655)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/QZS-5)  
**Source**: https://4ort.xyz/entity/michibiki-5

## Summary
Michibiki 5 was a Japanese navigation satellite that was lost in a launch failure on December 22, 2025. It was part of Japan's Quasi-Zenith Satellite System (QZSS) constellation designed to enhance GPS coverage in the Asia-Oceania region. The satellite was destroyed when the H3 Launch Vehicle's second stage malfunctioned during its eighth flight.

## Key Facts
- Launch date: December 22, 2025
- Launch vehicle: H3 Launch Vehicle (H3-F8 configuration)
- Operator: Quasi-Zenith Satellite System (QZSS) organization
- Manufacturer: Mitsubishi Electric
- Mass: 4,800 kg (dry mass), 1,800 kg (propellant mass)
- Satellite type: Navigation satellite (QZSS-5)
- Mission status: Launch failure - satellite lost
- Country of origin: Japan
- Satellite designation: 2025-308A
- International Designator: 67231

## FAQs
### Q: What was Michibiki 5's purpose?
A: Michibiki 5 was designed to be part of Japan's Quasi-Zenith Satellite System, which provides enhanced GPS navigation coverage specifically for the Asia-Oceania region. It would have operated in a highly inclined orbit to ensure continuous coverage over Japan.

### Q: Why did the Michibiki 5 launch fail?
A: The launch failed due to a second-stage anomaly with the H3 Launch Vehicle during its eighth flight. The exact technical details of the malfunction were not specified in the available sources.

### Q: What happened to the satellite after the launch failure?
A: The satellite was completely lost when the H3 Launch Vehicle experienced its second-stage anomaly. No recovery or salvage of the satellite was possible.

## Why It Matters
Michibiki 5 represented a critical component of Japan's strategic effort to achieve independent and enhanced navigation capabilities in the Asia-Pacific region. The Quasi-Zenith Satellite System was designed to complement and augment the existing GPS infrastructure, providing more reliable positioning, navigation, and timing services for Japan and surrounding areas, particularly in urban canyons and mountainous terrain where GPS signals can be degraded. The loss of Michibiki 5 represents a significant setback for Japan's space program and its ambitions for technological sovereignty in satellite navigation. This failure also impacts the planned expansion of the QZSS constellation, which was intended to provide continuous, high-precision positioning services for applications ranging from autonomous vehicles and maritime navigation to disaster response and national security. The incident highlights the inherent risks in space launch operations and the substantial investments required for maintaining and expanding satellite navigation infrastructure.

## Notable For
- Would have been the fifth satellite in Japan's QZSS constellation
- Designed for highly inclined orbit to provide continuous coverage over Japan
- Part of Japan's strategic initiative for independent navigation capabilities
- Lost during H3 Launch Vehicle's eighth flight, marking a second-stage failure
- Represented a 4,800 kg advanced navigation satellite investment

## Body
### Technical Specifications
Michibiki 5 was a sophisticated navigation satellite with a dry mass of 4,800 kg and propellant mass of 1,800 kg, making it a substantial spacecraft designed for long-duration operations in geostationary orbit. The satellite was built by Mitsubishi Electric, a leading Japanese aerospace manufacturer with extensive experience in satellite construction.

### Mission Profile
The satellite was intended to operate as part of the Quasi-Zenith Satellite System, which uses a constellation of satellites in highly inclined orbits to provide continuous coverage over Japan. Unlike traditional GPS satellites that orbit the Earth twice daily, QZSS satellites follow figure-eight patterns that keep them relatively stationary over the Asia-Oceania region, providing enhanced signal availability and accuracy.

### Launch Configuration
Michibiki 5 was scheduled to launch aboard the H3 Launch Vehicle's eighth flight (H3-F8 configuration). The H3 is Japan's next-generation expendable launch system developed by Mitsubishi Heavy Industries and the Japan Aerospace Exploration Agency (JAXA). The launch was planned from the Tanegashima Space Center.

### System Context
The Quasi-Zenith Satellite System represents Japan's answer to the need for reliable navigation services independent of the US-operated GPS system. The QZSS constellation provides several key advantages: improved urban canyon reception through signal multipath reduction, enhanced availability in mountainous regions, and the ability to provide centimeter-level positioning accuracy when combined with ground-based augmentation systems.

### Impact of Loss
The failure of the Michibiki 5 launch represents a significant financial loss for both the Japanese government and Mitsubishi Electric, as well as a delay in the planned expansion of the QZSS constellation. The incident also raises questions about the reliability of the H3 Launch Vehicle, which had been positioned as a key component of Japan's space launch capabilities for the coming decade. The loss affects not only the immediate mission but also potentially impacts future launch schedules and confidence in Japan's domestic launch capabilities.

## References

1. [Source](https://space.skyrocket.de/doc_sdat/qzs-5.htm)
2. [Source](https://qzss.go.jp/7satellite-constellation/qzs-5/outline.html)
3. Jonathan's Space Report
4. [Source](https://x.com/planet4589/status/2003185797563068864)
5. [Source](https://spacenews.com/japans-h3-suffers-second-stage-anomaly-qzs-5-satellite-lost/)
6. [Source](https://www.space.com/space-exploration/launches-spacecraft/japanese-h3-rocket-fails-during-launch-of-navigation-satellite)