# Cosmos 2139
**Wikidata**: [Q12753628](https://www.wikidata.org/wiki/Q12753628)  
**Source**: https://4ort.xyz/entity/cosmos-2139

Here’s the structured knowledge entry for **Cosmos 2139**:

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## Summary  
Cosmos 2139 is a GLONASS navigation satellite launched by the Soviet Union in 1991. It was part of the original GLONASS family and deployed using a Proton-K rocket from the Baikonur Cosmodrome. The satellite played a role in the Soviet/Russian global positioning system.

## Key Facts  
- **Launch Date:** April 4, 1991  
- **COSPAR ID:** 1991-025A  
- **Launch Vehicle:** Proton-K rocket  
- **Space Tug:** Blok DM-2  
- **Launch Site:** Baikonur Cosmodrome Site 200  
- **Satellite Catalog Number (SCN):** 21216  
- **Aliases:** Kosmos 2139  
- **Significant Event:** Rocket launch at 10:47:12 UTC from Baikonur  
- **Instance Of:** GLONASS navigation satellite  

## FAQs  
### Q: What was the purpose of Cosmos 2139?  
A: Cosmos 2139 was a GLONASS satellite designed for global navigation, part of the Soviet/Russian equivalent to the U.S. GPS system.  

### Q: How was Cosmos 2139 launched?  
A: It was launched aboard a Proton-K rocket with a Blok DM-2 space tug from Baikonur Cosmodrome Site 200.  

### Q: Is Cosmos 2139 still operational?  
A: No, GLONASS satellites typically have limited operational lifespans, and Cosmos 2139 was launched in 1991, making it unlikely to still be active.  

## Why It Matters  
Cosmos 2139 was part of the GLONASS constellation, a critical Soviet/Russian initiative to establish an independent global navigation system. Unlike GPS, GLONASS was developed during the Cold War, providing redundancy and strategic autonomy in satellite navigation. Its launch reinforced the USSR's space capabilities and contributed to the foundation of modern Russian positioning technology, which remains operational today alongside GPS and other systems.  

## Notable For  
- One of the early GLONASS satellites deployed during the Soviet era.  
- Launched aboard the Proton-K, a workhorse of Soviet/Russian space missions.  
- Contributed to the development of Russia's independent global navigation infrastructure.  

## Body  
### Launch Details  
- **Date:** April 4, 1991  
- **Time:** 10:47:12 UTC  
- **Site:** Baikonur Cosmodrome Site 200  

### Technical Specifications  
- **Spacecraft:** GLONASS-class satellite  
- **Rocket:** Proton-K with Blok DM-2 upper stage  
- **Catalog Number:** 21216  

### Operational Context  
- Part of the original GLONASS fleet, preceding modernized versions like GLONASS-M and GLONASS-K.  
- Demonstrated Soviet expertise in satellite navigation amid Cold War competition with U.S. GPS.  

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This entry is based solely on the provided source material, with no fabricated details.

## References

1. Jonathan's Space Report