# Thor-Agena A

> American orbital launch vehicle

**Wikidata**: [Q9358555](https://www.wikidata.org/wiki/Q9358555)  
**Source**: https://4ort.xyz/entity/thor-agena-a

## Summary
Thor-Agena A was an American orbital launch vehicle used to deploy military reconnaissance satellites, including the Discoverer series. It was part of the Thor-Agena family of rockets and consisted of a PGM-17 Thor first stage and an RM-81 Agena second stage.

## Key Facts
- **Type**: Orbital launch vehicle
- **Manufacturer**: Douglas
- **Country of Origin**: United States
- **Components**: PGM-17 Thor (first stage), RM-81 Agena (second stage)
- **Associated Missions**: Launched multiple Discoverer reconnaissance satellites (e.g., Discoverer 1, Discoverer 5, Discoverer 14)
- **Classification**: Subclass of the Thor-Agena rocket family
- **Wikidata Description**: "American orbital launch vehicle"

## FAQs
### Q: What was the Thor-Agena A used for?
A: The Thor-Agena A was primarily used to launch military reconnaissance satellites, such as the Discoverer series, for the United States.

### Q: Who manufactured the Thor-Agena A?
A: The Thor-Agena A was manufactured by Douglas, an American aerospace company.

### Q: What were the components of the Thor-Agena A?
A: It consisted of a PGM-17 Thor first stage and an RM-81 Agena second stage.

### Q: Which satellites were launched by the Thor-Agena A?
A: It launched several Discoverer satellites, including Discoverer 1, Discoverer 5, and Discoverer 14, among others.

### Q: What is the significance of the Thor-Agena A in space history?
A: The Thor-Agena A played a key role in early American military reconnaissance efforts, helping to establish satellite-based intelligence capabilities.

## Why It Matters
The Thor-Agena A was a critical launch vehicle in the early days of the U.S. space program, particularly for military reconnaissance. As part of the Discoverer program, it enabled the deployment of satellites that could gather intelligence from orbit, a capability that became foundational for national security. The Thor-Agena family of rockets also demonstrated the feasibility of multi-stage launch vehicles, influencing later rocket designs. Its role in launching some of the first successful reconnaissance satellites marked a significant advancement in space technology and Cold War-era surveillance.

## Notable For
- **Early Reconnaissance Missions**: Launched the Discoverer series, some of the first American reconnaissance satellites.
- **Multi-Stage Design**: Utilized a two-stage configuration (Thor + Agena), an important innovation in rocket engineering.
- **Military Significance**: Contributed to the development of satellite-based intelligence gathering during the Cold War.
- **Manufacturer Legacy**: Built by Douglas, a major aerospace company with a long history in rocket development.

## Body
### Overview
The Thor-Agena A was an orbital launch vehicle developed in the United States. It belonged to the Thor-Agena class of rockets, which were designed for military and reconnaissance purposes.

### Technical Specifications
- **Stages**:
  - **First Stage**: PGM-17 Thor (a modified intermediate-range ballistic missile)
  - **Second Stage**: RM-81 Agena (a restartable upper stage capable of precise orbital insertion)
- **Manufacturer**: Douglas Aircraft Company (later part of McDonnell Douglas)

### Missions and Payloads
The Thor-Agena A was primarily used to launch the Discoverer series of satellites, which were part of the Corona program—a classified U.S. military reconnaissance effort. Notable missions include:
- **Discoverer 1**: First in the series, launched in 1959 but failed to achieve orbit.
- **Discoverer 5**: Carried a recoverable capsule, demonstrating early satellite recovery technology.
- **Discoverer 14**: Successfully returned film from orbit, marking a milestone in reconnaissance capabilities.

### Legacy
The Thor-Agena A and its variants were instrumental in establishing the U.S. as a leader in space-based reconnaissance. The technology and experience gained from these launches influenced subsequent rocket designs and satellite programs.

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