# Thor-Delta

> American expendable launch system

**Wikidata**: [Q767119](https://www.wikidata.org/wiki/Q767119)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Thor-Delta)  
**Source**: https://4ort.xyz/entity/thor-delta

Here’s the structured knowledge entry for **Thor-Delta** based on the provided source material:

---

## Summary  
Thor-Delta is an American expendable launch system derived from the Thor rocket family and the Delta series. It was manufactured by Douglas and primarily used for launching satellites, including notable missions like Explorer 10 and Telstar 1. The system evolved from the earlier Thor-Able design and became part of the broader Delta rocket lineage.

## Key Facts  
- **Type**: Expendable launch system  
- **Country of Origin**: United States  
- **Manufacturer**: Douglas  
- **Based On**: Thor-Able rocket  
- **Parent Classes**: Thor (rocket family), Delta (launch system family)  
- **Variants**: Includes Delta A, B, C, D, E, F, G, J, L, M, and N  
- **Notable Payloads**: Explorer 10, Telstar 1, Ariel 1, OSO 1  
- **Aliases**: Delta DM-19, Thor DM-19 Delta  
- **First Stage**: Thor DM-19  
- **Upper Stages**: Delta 104 (second stage), Altair (third stage)  

## FAQs  
### Q: What was the Thor-Delta used for?  
A: The Thor-Delta was primarily used to launch scientific and communications satellites, including Explorer 10 and Telstar 1, during the 1960s.  

### Q: How is Thor-Delta related to the Thor and Delta rocket families?  
A: Thor-Delta is a hybrid system, combining the first stage of the Thor rocket with upper stages from the Delta series, making it a bridge between the two families.  

### Q: What satellites were launched by Thor-Delta?  
A: Notable satellites include Explorer 10, Telstar 1, Ariel 1, and several OSO (Orbiting Solar Observatory) missions.  

## Why It Matters  
The Thor-Delta played a pivotal role in early space exploration and satellite deployment. As one of the first reliable expendable launch systems, it enabled critical scientific missions, such as ionospheric research (Ariel 1) and solar observations (OSO series). Its success laid the groundwork for the Delta rocket family, which became a cornerstone of U.S. space launch capabilities. The system also contributed to advancements in communications, exemplified by the launch of Telstar 1, the first active communications satellite.  

## Notable For  
- **Hybrid Design**: Combined Thor and Delta technologies, creating a versatile launch system.  
- **Key Missions**: Launched Explorer 10, the first satellite to study Earth's magnetotail, and Telstar 1, a pioneering communications satellite.  
- **Evolutionary Role**: Served as a transitional model between early Thor rockets and the later Delta series.  

## Body  
### Overview  
Thor-Delta is an expendable launch system developed in the United States by Douglas. It is part of both the Thor and Delta rocket families, reflecting its hybrid design.  

### Design and Components  
- **First Stage**: Thor DM-19 (derived from the Thor IRBM).  
- **Second Stage**: Delta 104.  
- **Third Stage**: Altair solid-fuel motor.  
- **Payload Capacity**: Designed for small to medium satellites.  

### Notable Launches  
- **Explorer 10** (1961): Studied Earth's magnetosphere.  
- **Telstar 1** (1962): First active communications satellite.  
- **Ariel 1** (1962): First international satellite (U.K./U.S. collaboration).  

### Variants and Legacy  
Thor-Delta spawned multiple variants (Delta A-N) and influenced the development of later Delta rockets, which remain in use today.  

## Schema Markup  
```json
{
  "@context": "https://schema.org",
  "@type": "Thing",
  "name": "Thor-Delta",
  "description": "American expendable launch system derived from the Thor and Delta rocket families.",
  "sameAs": [
    "https://www.wikidata.org/wiki/Q7795639",
    "https://en.wikipedia.org/wiki/Thor-Delta"
  ],
  "additionalType": "Rocket Model"
}

## References

1. Freebase Data Dumps. 2013