# ASTEX

> U.S. Air Force technology demonstration satellite

**Wikidata**: [Q15006](https://www.wikidata.org/wiki/Q15006)  
**Source**: https://4ort.xyz/entity/astex

## Summary
ASTEX was a U.S. Air Force technology demonstration satellite launched in 1971 to test experimental space technologies. It was a 1,500-kilogram spacecraft powered by solar arrays and operated by the Space Test Program. The mission ended in 1973 when its radio transmitter failed.

## Key Facts
- **Class**: Technology demonstration spacecraft and military satellite
- **Mass**: 1,500 kilograms
- **Operator**: Space Test Program
- **Launch Date**: October 17, 1971, at 13:36 UTC
- **Launch Vehicle**: Thorad-Agena D (flight number 570)
- **Orbit**: Polar orbit
- **Launch Site**: Vandenberg Space Launch Complex 1 West
- **Significant Event**: Radio transmitter failure in December 1973
- **Country of Origin**: United States
- **Aliases**: P71-2, STP P71-2, Advanced Space Technology Experiment

## FAQs
### Q: What was the purpose of the ASTEX satellite?
A: ASTEX was designed to demonstrate experimental space technologies for the U.S. Air Force. It tested various systems in a polar orbit.

### Q: Who operated the ASTEX satellite?
A: The ASTEX satellite was operated by the Space Test Program, a division of the U.S. Air Force.

### Q: What happened to the ASTEX satellite?
A: The ASTEX satellite's radio transmitter failed in December 1973, marking the end of its operational life.

### Q: What was the launch vehicle for ASTEX?
A: ASTEX was launched using a Thorad-Agena D rocket, flight number 570, from Vandenberg Space Launch Complex 1 West.

### Q: How heavy was the ASTEX satellite?
A: The ASTEX satellite had a mass of 1,500 kilograms.

## Why It Matters
ASTEX played a crucial role in advancing space technology for military applications. As a technology demonstration satellite, it provided the U.S. Air Force with valuable data on experimental systems operating in space. The mission contributed to the development of future satellite capabilities, particularly in polar orbits. Despite its radio transmitter failure in 1973, ASTEX successfully tested key technologies before its operational end. Its legacy lies in its role as an early example of the Air Force's commitment to space-based experimentation and innovation.

## Notable For
- **First of its kind**: One of the earliest U.S. Air Force technology demonstration satellites.
- **Polar orbit testing**: Demonstrated the feasibility of experimental technologies in polar orbits.
- **Military focus**: Designed specifically for military space applications.
- **Solar-powered**: Utilized spacecraft solar arrays for power, a common feature in later satellites.
- **Thorad-Agena D launch**: Marked the first use of this rocket variant for a military satellite.

## Body
### Overview
ASTEX (Advanced Space Technology Experiment) was a U.S. Air Force satellite launched on October 17, 1971, to test experimental space technologies. Operated by the Space Test Program, it was a 1,500-kilogram spacecraft powered by solar arrays and placed in a polar orbit.

### Mission Details
- **Primary Objective**: Demonstrate experimental technologies for military applications.
- **Launch Vehicle**: Thorad-Agena D, flight number 570, from Vandenberg Space Launch Complex 1 West.
- **Orbit**: Polar orbit, allowing for comprehensive testing of systems in different orbital conditions.

### Significant Events
- **Launch**: Successful launch on October 17, 1971, at 13:36 UTC.
- **Failure**: The satellite's radio transmitter failed in December 1973, ending its operational life.

### Legacy
ASTEX contributed to the development of military space technology and set the stage for future satellite missions. Its polar orbit and experimental focus made it a key early example of the Air Force's space-based innovation efforts.

## References

1. [Source](https://space.skyrocket.de/doc_sdat/astex.htm)
2. Jonathan's Space Report
3. Quora