# Delta

> family of expendable launch systems

**Wikidata**: [Q49506](https://www.wikidata.org/wiki/Q49506)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Delta_(rocket_family))  
**Source**: https://4ort.xyz/entity/delta

## Summary
Delta is a family of expendable launch systems developed in the United States, used to deploy satellites and spacecraft into orbit. It includes multiple generations of rockets, such as Delta II, Delta III, and Delta IV, with some variants now retired.

## Key Facts
- Delta is a family of expendable launch vehicles, meaning each rocket is used once and discarded.
- The Delta rocket family includes retired systems like Delta II, Delta III, and Delta IV Heavy, as well as active variants like Delta IV.
- Manufacturers include Douglas (1959–1967), McDonnell Douglas (1967–1997), Boeing (1997–2006), and United Launch Alliance.
- The first member of the Delta family was the Delta 104 rocket stage.
- Delta rockets have been used to launch various satellites, including meteorological and planetary exploration missions.
- The Delta IV Heavy is a retired heavy-lift variant of the Delta IV.
- The Delta rocket family is of American origin and has been operated by United Launch Alliance.

## FAQs
### Q: What is the Delta rocket family?
A: The Delta rocket family is a series of expendable launch systems developed in the United States, used primarily for deploying satellites and spacecraft into orbit.

### Q: Who manufactures Delta rockets?
A: Delta rockets have been manufactured by Douglas (1959–1967), McDonnell Douglas (1967–1997), Boeing (1997–2006), and United Launch Alliance.

### Q: What are some notable variants of the Delta rocket family?
A: Notable variants include Delta II, Delta III, Delta IV, and the heavy-lift Delta IV Heavy, some of which are now retired.

### Q: What was the first Delta rocket?
A: The first member of the Delta family was the Delta 104 rocket stage.

### Q: What types of missions have Delta rockets been used for?
A: Delta rockets have been used for a variety of missions, including launching meteorological satellites like ITOS-I and ITOS-J, as well as planetary exploration missions.

## Why It Matters
The Delta rocket family has played a crucial role in the history of space exploration and satellite deployment. As a series of expendable launch systems, Delta rockets have been instrumental in placing numerous satellites into orbit, contributing to meteorological studies, communications, and scientific research. The family's evolution over decades reflects advancements in rocket technology and the growing demands of space missions. Delta rockets have supported both government and commercial launches, making them a cornerstone of American space capabilities. Their reliability and versatility have ensured their continued use, even as newer launch systems emerge.

## Notable For
- Being one of the longest-serving families of expendable launch vehicles in the United States.
- Including the Delta IV Heavy, a powerful heavy-lift variant capable of launching large payloads.
- Supporting a wide range of missions, from meteorological satellites to planetary exploration.
- Transitioning through multiple manufacturers, including Douglas, McDonnell Douglas, Boeing, and United Launch Alliance.
- Contributing significantly to the development of American space launch capabilities.

## Body
### Overview
The Delta rocket family is a series of expendable launch systems designed for deploying satellites and spacecraft into orbit. These rockets are used once and discarded, making them distinct from reusable launch systems.

### History and Manufacturers
- **Douglas (1959–1967):** The initial manufacturer of the Delta rocket family.
- **McDonnell Douglas (1967–1997):** Took over production and continued the development of Delta rockets.
- **Boeing (1997–2006):** Acquired McDonnell Douglas and continued manufacturing Delta rockets.
- **United Launch Alliance:** The current operator of the Delta rocket family.

### Variants
- **Delta II:** A retired expendable launch system known for its reliability and extensive use in satellite deployments.
- **Delta III:** A retired variant that was designed for heavier payloads but had limited success.
- **Delta IV:** An active expendable launch system with multiple configurations, including the heavy-lift Delta IV Heavy.
- **Delta IV Heavy:** A retired heavy-lift variant capable of launching large payloads into orbit.
- **Delta 0100, Delta 1000, Delta 2000, Delta 3000, Delta 4000, Delta 5000:** Series of American expendable launch systems within the Delta family.
- **Thor-Delta:** An early American expendable launch system that was part of the Delta family.

### Notable Missions
Delta rockets have been used to launch various satellites and spacecraft, including:
- **ITOS-I and ITOS-J:** Meteorological satellites part of the National Operational Meteorological Satellite System (NOMSS).
- **Planetary Explorer-A:** A proposed mission for exploring Venus, though it was not authorized as of July 1971.
- **ISIS-C and ITOS-E2:** Additional satellites launched by Delta rockets for scientific and meteorological purposes.

### Technical Specifications
- **Expendable Launch Vehicle:** Each Delta rocket is designed for single-use, with no recovery or reuse of components.
- **Country of Origin:** United States.
- **Operator:** United Launch Alliance.

## Schema Markup
```json
{
  "@context": "https://schema.org",
  "@type": "Thing",
  "name": "Delta",
  "description": "family of expendable launch systems",
  "sameAs": ["https://www.wikidata.org/wiki/Q64139102", "https://en.wikipedia.org/wiki/Delta_(rocket_family)"],
  "additionalType": "rocket family"
}

## References

1. Freebase Data Dumps. 2013
2. BabelNet
3. KBpedia
4. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)