# Cluster 1

> one of four identical magnetospheric research satellites in the Cluster II constellation

**Wikidata**: [Q111658821](https://www.wikidata.org/wiki/Q111658821)  
**Source**: https://4ort.xyz/entity/cluster-1

## Summary
Cluster 1 is one of four identical magnetospheric research satellites in the Cluster II constellation, launched by the European Space Agency (ESA) on August 9, 2000. It is part of a mission to study Earth's magnetosphere and related regions, providing critical data on space weather and geomagnetic interactions.

## Key Facts
- **Part of the Cluster II constellation**: One of four identical satellites launched in 2000.
- **Classified as a geomagnetic satellite**: Designed to monitor Earth's magnetosphere and related regions.
- **Launched on August 9, 2000**: Deployed from Baikonur Cosmodrome Site 31 using a Soyuz-U rocket.
- **Mass**: 1,200 kg at launch weight, 550 kg at dry weight.
- **Dimensions**: 1.3 meters in height and 2.9 meters in diameter.
- **Powered by solar cell panels**: Equipped with 224 solar cells and an S400 power system.
- **Operated by the European Space Operations Centre**: Managed by ESA’s ground control.
- **Designed for 5 years of service**: Expected operational life of five years.
- **Aliases**: Also known as Rumba, Cluster Rumba, Cluster C1, and Cluster FM5.
- **NAIF ID**: -183, used for spacecraft identification in NASA’s Navigation and Ancillary Information Facility.

## FAQs
### Q: What was the purpose of Cluster 1?
A: Cluster 1 was part of the Cluster II mission to study Earth's magnetosphere, focusing on space weather and geomagnetic interactions. It provided critical data on plasma, electric fields, and particle environments.

### Q: How was Cluster 1 launched?
A: Cluster 1 was launched on August 9, 2000, from Baikonur Cosmodrome Site 31 using a Soyuz-U rocket. It was one of four identical satellites deployed in the Cluster II constellation.

### Q: What are the key specifications of Cluster 1?
A: Cluster 1 had a launch mass of 1,200 kg, a dry mass of 550 kg, and dimensions of 1.3 meters in height and 2.9 meters in diameter. It was powered by 224 solar cells and an S400 power system.

### Q: Who operated Cluster 1?
A: Cluster 1 was operated by the European Space Operations Centre (ESOC), part of the European Space Agency (ESA).

### Q: What is the significance of Cluster 1’s NAIF ID?
A: The NAIF ID (-183) is used in NASA’s Navigation and Ancillary Information Facility to uniquely identify Cluster 1 in spacecraft tracking and mission planning.

## Why It Matters
Cluster 1 played a crucial role in the Cluster II mission, which aimed to study Earth’s magnetosphere and its interactions with solar wind. By deploying four identical satellites in tetrahedral formation, the mission provided unprecedented three-dimensional data on plasma, electric fields, and particle environments. This research advanced understanding of space weather, geomagnetic storms, and the dynamics of Earth’s magnetic field. The mission’s findings have applications in satellite operations, space weather forecasting, and protecting critical infrastructure from solar disturbances.

## Notable For
- **First tetrahedral satellite constellation**: Cluster II was the first mission to use four satellites in a tetrahedral formation, enabling comprehensive 3D mapping of Earth’s magnetosphere.
- **Pioneering magnetospheric research**: Provided groundbreaking data on plasma waves, electric fields, and particle acceleration in Earth’s magnetosphere.
- **Long-duration mission**: Operated successfully for over five years, exceeding its design life.
- **International collaboration**: Launched by the Soviet Union (via Soyuz-U) but operated by the European Space Agency (ESA), showcasing cross-border space cooperation.
- **Advanced instrumentation**: Equipped with state-of-the-art sensors for measuring magnetic fields, plasma, and particle environments.

## Body
### Mission Overview
Cluster 1 was launched as part of the Cluster II mission, a constellation of four identical satellites designed to study Earth’s magnetosphere. The mission aimed to provide three-dimensional data on plasma, electric fields, and particle environments, advancing understanding of space weather and geomagnetic interactions.

### Launch Details
- **Launch Date**: August 9, 2000, at 11:13:35 UTC.
- **Launch Site**: Baikonur Cosmodrome Site 31, Soviet Union (now Kazakhstan).
- **Launch Vehicle**: Soyuz-U rocket, model A 15000-070.
- **Space Tug**: Fregat upper stage, model 1004.

### Technical Specifications
- **Mass**:
  - Launch weight: 1,200 kg.
  - Dry weight: 550 kg.
- **Dimensions**:
  - Height: 1.3 meters.
  - Diameter: 2.9 meters.
- **Power System**:
  - Primary: Solar cell panels with 224 solar cells.
  - Secondary: S400 power system.
- **Design Life**: Five years.

### Operational Details
- **Operator**: European Space Operations Centre (ESOC).
- **Manufacturer**: Astrium.
- **Identifiers**:
  - COSPAR ID: 2000-045A.
  - NSSDCA ID: 2000-045A.
  - NAIF ID: -183.

### Scientific Contributions
Cluster 1 contributed to the mission’s objectives by providing high-resolution data on Earth’s magnetosphere, including plasma waves, electric fields, and particle acceleration. The tetrahedral formation of the Cluster II constellation allowed for comprehensive 3D mapping, revolutionizing magnetospheric research.

### Legacy
The Cluster II mission, including Cluster 1, set new standards for magnetospheric research and space weather monitoring. Its findings continue to inform satellite operations, space weather forecasting, and the protection of critical infrastructure from solar disturbances.

## References

1. [Source](https://space.skyrocket.de/doc_sdat/cluster.htm)
2. Jonathan's Space Report
3. [Source](https://sci.esa.int/web/cluster/-/47348-fact-sheet)