# Space Tethered Autonomous Robotic Satellite I

> Japanese tethered nano-satellite

**Wikidata**: [Q11244502](https://www.wikidata.org/wiki/Q11244502)  
**Source**: https://4ort.xyz/entity/space-tethered-autonomous-robotic-satellite-i

## Summary
Space Tethered Autonomous Robotic Satellite I (STARS-1) is a Japanese tethered nano-satellite developed by Kagawa University to demonstrate experimental tethered satellite technology. Launched in 2009, it consists of two connected modules designed to test deployment and dynamics in orbit.

## Key Facts
- **Launch Date**: January 23, 2009, at 03:54 UTC aboard an H-IIA rocket (H-IIA-15 variant).
- **Mass**: 7.96 kg, classifying it as a nanosatellite.
- **Operator/Manufacturer**: Kagawa University, a higher education institution in Takamatsu, Japan.
- **Orbit**: Sun-synchronous orbit.
- **Mission**: Technology demonstration for tethered satellite systems.
- **Aliases**: Also known as STARS-I or Kukai (named after the Buddhist monk Kūkai).
- **COSPAR ID**: 2009-002G.
- **Launch Site**: Yoshinobu Launch Complex Launch Pad 1.

## FAQs
### Q: What is the purpose of STARS-1?
A: STARS-1 is a technology demonstration spacecraft designed to test tethered satellite systems, where two modules are connected by a cable in orbit.

### Q: Who built and operates STARS-1?
A: Kagawa University in Japan developed, manufactured, and operates the satellite.

### Q: When was STARS-1 launched?
A: It was launched on January 23, 2009, using an H-IIA rocket from Japan’s Yoshinobu Launch Complex.

### Q: What does "tethered satellite" mean?
A: A tethered satellite consists of two parts connected by a cable, used to test dynamics, deployment, and potential applications like momentum exchange or power generation.

### Q: What is the mass of STARS-1?
A: The satellite has a mass of 7.96 kg, placing it in the nanosatellite category.

## Why It Matters
STARS-1 represents an early effort in tethered satellite technology, which has potential applications in space debris mitigation, orbital maneuvering, and power generation. By demonstrating the feasibility of deploying and controlling tethered systems in orbit, it contributes to advancements in satellite dynamics and space engineering. As a nanosatellite, it also showcases how small, cost-effective spacecraft can be used for experimental missions, lowering the barrier for academic institutions to participate in space research. The mission’s success helps validate theoretical models of tethered systems, paving the way for future missions with more complex objectives.

## Notable For
- **First Japanese tethered nanosatellite**: One of the earliest demonstrations of tethered satellite technology in a compact, low-mass form factor.
- **Academic-led mission**: Developed entirely by Kagawa University, highlighting the role of universities in space innovation.
- **Dual-module design**: Consists of two connected units to test tether deployment and orbital dynamics.
- **Named after Kūkai**: Honors the historic Buddhist monk, reflecting cultural significance in its naming.
- **Sun-synchronous orbit**: Operates in an orbit optimized for consistent solar illumination, useful for technology testing.

## Body
### Overview
Space Tethered Autonomous Robotic Satellite I (STARS-1) is a Japanese nanosatellite designed to demonstrate tethered satellite technology. It was developed by Kagawa University and launched on January 23, 2009, as part of a broader mission to validate experimental space systems.

### Technical Specifications
- **Mass**: 7.96 kg.
- **Classification**: Nanosatellite (under 10 kg), tethered satellite, technology demonstration spacecraft.
- **Orbit**: Sun-synchronous orbit, ensuring consistent lighting conditions for experiments.
- **Launch Vehicle**: H-IIA (H-IIA-15 variant), a medium-lift Japanese rocket.
- **COSPAR ID**: 2009-002G (international designation for tracking).

### Mission Objectives
The primary goal of STARS-1 is to test the deployment and behavior of a tethered system in microgravity. The satellite consists of two modules connected by a cable, allowing researchers to study:
- Tether dynamics in orbit.
- Deployment mechanisms.
- Potential applications for future missions, such as momentum exchange or electromagnetic tethering.

### Development and Launch
- **Manufacturer/Operator**: Kagawa University, located in Takamatsu, Kagawa Prefecture, Japan.
- **Launch Date**: January 23, 2009, at 03:54 UTC.
- **Launch Site**: Yoshinobu Launch Complex Launch Pad 1, part of Japan’s Tanegashima Space Center.
- **Named After**: The satellite is nicknamed "Kukai" in honor of the Buddhist monk Kūkai, a significant historical figure in Japan.

### Significance
STARS-1 is part of a growing trend of academic institutions developing small satellites for research. Its success helps validate tethered satellite concepts, which could be used for:
- Space debris removal.
- Orbital altitude adjustments without traditional propulsion.
- Power generation via electromagnetic tethers.

### References
Key sources include:
- Kagawa University’s project page (archived).
- Gunter’s Space Page (space.skyrocket.de).
- Wikidata and associated references.

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## References

1. [Source](https://space.skyrocket.de/doc_sdat/stars-1.htm)
2. Jonathan's Space Report
3. [Source](http://stars1.eng.kagawa-u.ac.jp/english/about_kukai.html)