# Cosmos 555
**Wikidata**: [Q13566878](https://www.wikidata.org/wiki/Q13566878)  
**Source**: https://4ort.xyz/entity/cosmos-555

## Summary
Cosmos 555 was a Soviet Zenit 2M reconnaissance satellite launched in 1973 to conduct photographic intelligence missions. It was deployed via a Voskhod rocket from Plesetsk Cosmodrome and operated for approximately four days before re-entering Earth's atmosphere. The satellite was part of the Soviet Union's Cold War-era spy satellite program.

## Key Facts
- **Launch Date**: April 25, 1973, at 10:45:00 UTC.
- **COSPAR ID**: 1973-024A.
- **Satellite Class**: Zenit 2M, a Soviet spy satellite model.
- **Launch Vehicle**: Voskhod rocket (Soviet launch vehicle).
- **Launch Site**: Plesetsk Cosmodrome Site 43/4.
- **SCN Number**: 06440.
- **Mission Duration**: ~4 days (decayed on April 29, 1973).
- **Purpose**: Photographic reconnaissance for military intelligence.

## FAQs
### Q: When was Cosmos 555 launched?
A: Cosmos 555 was launched on April 25, 1973, at 10:45:00 UTC from Plesetsk Cosmodrome Site 43/4 aboard a Voskhod rocket.

### Q: What was the purpose of Cosmos 555?
A: It was a Zenit 2M spy satellite designed for photographic reconnaissance, gathering intelligence for the Soviet Union during the Cold War.

### Q: How long did Cosmos 555 operate?
A: The satellite decayed on April 29, 1973, approximately four days after launch, typical of Zenit 2M missions that returned film capsules to Earth.

## Why It Matters
Cosmos 5655 represents a key component of the Soviet Union's space-based reconnaissance efforts during the Cold War. As part of the Zenit 2M series, it exemplified the technological advancements and strategic priorities of the era, providing critical photographic intelligence to support military and political decision-making. Its short orbital lifespan reflects the typical mission profile of film-return satellites, which required rapid recovery of imagery. The satellite’s launch via a Voskhod rocket also highlights the adaptability of Soviet launch systems for both crewed and uncrewed missions, underscoring the integrated nature of their space program. For historians and analysts, Cosmos 555 offers insights into the covert operations and technological rivalry that defined the space race.

## Notable For
- **Zenit 2M Series**: Part of a prolific line of Soviet spy satellites known for film-return capsules.
- **Voskhod Launch Vehicle**: Demonstrated the rocket’s dual use for crewed and uncrewed missions.
- **Short Mission Duration**: Operated for only four days, consistent with the rapid-recovery design of Zenit satellites.
- **Cold War Context**: Contributed to the Soviet Union’s intelligence-gathering capabilities amid geopolitical tensions.

## Body
### Launch Details
- **Date/Time**: April 25, 1973, at 10:45:00 UTC.
- **Launch Site**: Plesetsk Cosmodrome Site 43/4, a key Soviet spaceport.
- **Launch Vehicle**: Voskhod rocket (identified as the launch vehicle class in source material).

### Satellite Specifications
- **Class**: Zenit 2M, a second-generation Soviet reconnaissance satellite.
- **SCN/COSPAR IDs**: SCN 06440, COSPAR 1973-024A.
- **Mission Type**: Photographic reconnaissance with film-return capsules.

### Mission Profile
- **Decay Date**: April 29, 1973, after completing its mission.
- **Operational Period**: ~4 days, standard for Zenit 2M satellites that ejected film canisters for mid-air recovery.

### Legacy
- **Historical Context**: Part of the broader Zenit program, which conducted over 500 missions between 1961 and 1996.
- **Technological Role**: Embodied Soviet advancements in space-based espionage, influencing later satellite designs.
- **Documentation**: Cited in academic and Wikidata sources (references Q6272367, Q200386).

## References

1. Jonathan's Space Report