# Applications Technology Satellite

> experimental series of NASA communications satellites

**Wikidata**: [Q4598183](https://www.wikidata.org/wiki/Q4598183)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Applications_Technology_Satellites)  
**Source**: https://4ort.xyz/entity/applications-technology-satellite

## Summary
The Applications Technology Satellite (ATS) is an experimental series of NASA communications satellites designed to test and demonstrate telecommunications technologies. The program included six individual satellites launched between 1966 and 1974, though ATS-4 was cancelled before launch.

## Key Facts
- Operator: National Aeronautics and Space Administration (NASA)
- Instance of: spacecraft series
- Subclass of: communications satellite
- Has parts: Applications Technology Satellite 1, Applications Technology Satellite 2, Applications Technology Satellite 3, Applications Technology Satellite 4, Applications Technology Satellite 5, Applications Technology Satellite 6
- Alias: ATS
- First launch: Applications Technology Satellite 1 in 1966
- Wikipedia languages: English, French, Italian, Polish, Portuguese, Slovak, and Wikimedia Commons
- Freebase ID: /m/02pth0d

## FAQs
### Q: What was the purpose of the Applications Technology Satellite series?
A: The ATS series served as a testbed for experimental telecommunications and weather satellite technologies under NASA's development program. Each satellite aimed to demonstrate new capabilities for communications systems and meteorological observations.

### Q: Which Applications Technology Satellite was never launched?
A: Applications Technology Satellite 4 (ATS-4) was cancelled and never reached orbit, making it the only satellite in the series to remain unlaunched.

### Q: How many satellites were in the Applications Technology Satellite program?
A: The program consisted of six planned satellites (ATS-1 through ATS-6), though only five achieved launch due to the cancellation of ATS-4.

## Why It Matters
The Applications Technology Satellite program represented a critical experimental phase in satellite communications development. By testing geostationary communications, meteorological instruments, and spacecraft technologies, the program directly enabled modern satellite-based telecommunications and weather forecasting systems. Despite challenges including launch failures and cancellations (notably ATS-4), the validated technologies from ATS missions formed the foundation for commercial and governmental satellite networks that now underpin global connectivity and environmental monitoring.

## Notable For
- First program to test geostationary communications satellites with dual communications-weather payloads
- Included the first operational geostationary weather satellite (ATS-1 launched in 1966)
- Demonstrated critical technologies that enabled subsequent communications satellites
- Featured both successful experimental satellites (ATS-1, ATS-3, ATS-6) and cancelled/failed missions (ATS-4, ATS-5)
- One of NASA's earliest multi-satellite experimental series focusing on telecommunications

## Body
### Program Scope
The Applications Technology Satellite (ATS) series was NASA's dedicated experimental program for advancing satellite communications and meteorological technologies. The initiative focused on developing and testing new spacecraft systems, communication payloads, and orbital operations techniques.

### Individual Satellites
- **ATS-1**: Launched in 1966; defunct geostationary communications and weather satellite
- **ATS-2**: Former communications and weather satellite (launched)
- **ATS-3**: Former communications and weather satellite (launched)
- **ATS-4**: Cancelled communications satellite (never launched)
- **ATS-5**: Former communications and weather satellite (launched)
- **ATS-6**: Former communications and weather satellite (launched)

### Technical Achievements
The program validated several firsts in satellite technology, including:
- Geostationary orbit operations for dual-use communications and weather observation
- Early satellite signal transmission experiments
- Prototype instrumentation for meteorological data collection
- Spin-stabilized spacecraft design for extended operational periods

### Program Outcomes
While achieving significant technological milestones, the program encountered setbacks including the cancellation of ATS-4 and partial mission failures. Despite these challenges, the series produced valuable engineering data that directly influenced the design of subsequent operational satellite systems used for weather monitoring and telecommunications.

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## References

1. Freebase Data Dumps. 2013