# Cosmos 621
**Wikidata**: [Q12753926](https://www.wikidata.org/wiki/Q12753926)  
**Source**: https://4ort.xyz/entity/cosmos-621

## Summary
Cosmos 621 is a Soviet military communications satellite launched in 1973 as part of the Strela-1M constellation. It was launched aboard a Kosmos-3M rocket from the Plesetsk Cosmodrome and operated by the Soviet Union. The satellite served as part of a low-orbit communication network for military purposes.

## Key Facts
- **Launch Date**: December 19, 1973  
- **COSPAR ID**: 1973-104E  
- **Satellite Class**: Strela-1M  
- **Launch Vehicle**: Kosmos-3M rocket  
- **Launch Site**: Plesetsk Cosmodrome, Site 132  
- **Country of Origin**: Soviet Union (now Russia)  
- **Significant Event**: Rocket launch at 09:43 UTC on December 19, 1973  
- **Alternative Name**: Kosmos 621  

## FAQs
### Q: What was the purpose of Cosmos 621?  
A: Cosmos 621 was a military communications satellite designed to facilitate secure low-orbit communication for Soviet forces.  

### Q: Where was Cosmos 621 launched from?  
A: It was launched from Plesetsk Cosmodrome Site 132 in the Soviet Union.  

### Q: What rocket was used to launch Cosmos 621?  
A: The satellite was carried into orbit by a Kosmos-3M rocket.  

## Why It Matters  
Cosmos 621 was part of the Strela-1M satellite network, which played a critical role in Soviet military communications during the Cold War. These satellites provided secure, low-latency messaging for military operations, ensuring command and control capabilities even in remote areas. The success of such missions demonstrated the Soviet Union's advancements in space-based military technology, contributing to the broader space race and geopolitical tensions of the era.  

## Notable For  
- **Military Application**: Part of a secure communication network for Soviet forces.  
- **Launch Precision**: Deployed successfully via the reliable Kosmos-3M rocket.  
- **Historical Context**: Represented Cold War-era advancements in space technology.  

## Body  
### Launch Details  
- **Date**: December 19, 1973  
- **Time**: 09:43 UTC  
- **Site**: Plesetsk Cosmodrome Site 132  

### Technical Specifications  
- **Satellite Class**: Strela-1M (military communications)  
- **Launch Vehicle**: Kosmos-3M (a Soviet orbital launch system)  

### Operational Role  
- Part of a constellation providing encrypted military communications.  
- Operated in low Earth orbit for optimal signal relay.  

### Historical Significance  
- Contributed to Soviet military communications infrastructure.  
- Demonstrated the reliability of the Kosmos-3M launch system.

## References

1. Jonathan's Space Report