# Akebono

> Japanese research satellite

**Wikidata**: [Q2828969](https://www.wikidata.org/wiki/Q2828969)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Akebono_(satellite))  
**Source**: https://4ort.xyz/entity/akebono

## Summary
Akebono is a Japanese research satellite (EXOS-D) launched in 1989 by the Institute of Space and Astronautical Science to study Earth's upper atmosphere and auroras. It operated successfully for over 26 years before retirement in 2015, becoming one of Japan's longest-serving scientific satellites.

## Key Facts
- Akebono is a Japanese research satellite, also known as EXOS-D
- It was launched on February 21, 1989 from Uchinoura Space Center using an M-3S2 rocket
- The satellite had a mass of 294 kilograms with dimensions of 126 cm (width) and 100 cm (height)
- It was operated by the Institute of Space and Astronautical Science
- Akebono was part of the EXOS program and was succeeded by Ohzora
- It was retired on April 23, 2015, after 26 years of operation
- The satellite was powered by 4-panel solar arrays

## FAQs
### Q: What was Akebono's scientific purpose?
A: Akebono was designed for scientific research focusing on Earth's upper atmosphere, particularly studying auroras, ionosphere, and magnetosphere phenomena.

### Q: How long did Akebono remain operational?
A: Akebono operated for an exceptionally long period of over 26 years, from its launch on February 21, 1989 until its retirement on April 23, 2015.

### Q: What made Akebono different from other research satellites?
A: Akebono distinguished itself through its extended operational lifespan of 26+ years, specialized focus on auroral research, and its role in advancing Japan's space research capabilities as part of the EXOS program.

### Q: How was Akebono powered during its mission?
A: The satellite utilized solar power through spacecraft solar arrays with 4 panels, providing continuous energy throughout its long operational life.

## Why It Matters
Akebono played a significant role in advancing space physics research by providing continuous data on Earth's upper atmosphere for over 26 years. As one of Japan's pioneering research satellites, it contributed to our understanding of space weather, auroral phenomena, and their effects on technological systems. The satellite's exceptional longevity demonstrated Japanese engineering reliability in space operations and established a foundation for future research missions. The data collected by Akebono helped scientists develop better models of space weather prediction and understand complex interactions between solar wind and Earth's magnetosphere, with practical applications for satellite protection and communication systems.

## Notable For
- Exceptional operational lifespan of 26+ years (1989-2015), making it one of Japan's longest-serving research satellites
- Part of the pioneering EXOS program dedicated to auroral and ionospheric research
- Provided continuous scientific observations of Earth's magnetosphere and ionosphere over an extended period
- Successfully operated by the Institute of Space and Astronautical Science using domestic M-3S2 launch technology
- Contributed to fundamental space physics research that improved our understanding of space weather phenomena

## Body
### Mission Overview
Akebono was a Japanese research satellite officially designated as EXOS-D. It was operated by the Institute of Space and Astronautical Science and served as an important scientific platform for studying Earth's upper atmosphere phenomena. The satellite followed earlier missions and was itself succeeded by Ohzora, maintaining continuity in Japan's space research efforts.

### Technical Specifications
The satellite had physical dimensions of 126 centimeters in width and 100 centimeters in height, with a total mass of 294 kilograms. It was equipped with spacecraft solar arrays featuring 4 panels for power generation. Akebono operated with an orbital inclination of 75.1 degrees, optimized for observing auroral phenomena in Earth's polar regions.

### Operations Timeline
Akebono was launched on February 21, 1989, at 23:30:00 from the Uchinoura Space Center using an M-3S2-2 launch vehicle. It completed its successful operations on April 23, 2015, at 06:59, having served for more than 26 years. The satellite maintained its scientific functions throughout this extended period despite the challenges of long-duration space missions.

### Scientific Contributions
As a research satellite, Akebono focused on investigating auroral phenomena, ionospheric dynamics, and magnetospheric processes. The data collected contributed to understanding space weather and its effects on technological systems on Earth. The long duration of the mission provided scientists with unprecedented long-term datasets for studying space phenomena.

### Program Context
Akebono was part of the broader EXOS (EXospheric satellite) program initiated by Japan's space research community. It was managed by the Institute of Space and Astronautical Science, which has been at the forefront of Japanese space research since its establishment in 1955. The satellite represented Japan's growing capabilities in developing and operating scientific spacecraft independently.

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## References

1. [Source](https://space.skyrocket.de/doc_sdat/exos-d.htm)
2. Jonathan's Space Report
3. Freebase Data Dumps. 2013
4. [Source](https://global.jaxa.jp/projects/sas/akebono/)
5. [Source](http://www.isas.jaxa.jp/e/enterp/missions/akebono/)