# Cosmos 550
**Wikidata**: [Q12753894](https://www.wikidata.org/wiki/Q12753894)  
**Source**: https://4ort.xyz/entity/cosmos-550

## Summary
Cosmos 550 was a Soviet reconnaissance satellite launched on March 1, 1973, as part of the Zenit-4MK series. It was deployed using a Voskhod rocket from Plesetsk Cosmodrome Site 41 to conduct photo surveillance. The satellite played a role in the Soviet Union's military intelligence-gathering efforts during the Cold War.

## Key Facts
- **Launch Date**: March 1, 1973, at 12:40:02 UTC.
- **COSPAR ID**: 1973-011A.
- **Satellite Class**: Zenit-4MK, a Soviet photoreconnaissance satellite type.
- **Launch Vehicle**: Voskhod, a Soviet rocket derived from the R-7 family.
- **Launch Site**: Plesetsk Cosmodrome Site 41 in the Soviet Union.
- **SCN (Satellite Catalog Number)**: 06376.
- **Mission Type**: Military reconnaissance for the Soviet Armed Forces.

## FAQs
### Q: When was Cosmos 550 launched?
A: Cosmos 550 was launched on March 1, 1973, at 12:40:02 UTC from Plesetsk Cosmodrome Site 41.

### Q: What was the purpose of Cosmos 550?
A: The satellite was designed for photoreconnaissance, gathering imagery for Soviet military intelligence during the Cold War.

### Q: What rocket was used to launch Cosmos 550?
A: The satellite was deployed using a Voskhod launch vehicle, a modified version of the R-7 rocket.

## Why It Matters
Cosmos 550 represents a typical example of the Soviet Union's use of space-based reconnaissance during the Cold War. As part of the Zenit-4MK series, it contributed to the systematic monitoring of strategic targets, providing critical intelligence to support military planning and geopolitical decision-making. The Voskhod rocket's reliability and the Plesetsk Cosmodrome's strategic location underscored the Soviet space program's operational efficiency. While individual Zenit missions like Cosmos 550 were not publicly detailed, their cumulative role in maintaining Soviet intelligence capabilities highlights their significance in the broader context of Cold War espionage and space-based surveillance.

## Notable For
- **Reconnaissance Mission**: Part of the Zenit-4MK series focused on high-resolution photographic surveillance.
- **Voskhod Rocket Deployment**: Utilized a launch vehicle originally designed for crewed spaceflight, repurposed for satellite launches.
- **Plesetsk Launch Site**: Launched from a northern cosmodrome, enabling polar orbits for global coverage.
- **Cold War Context**: Operated during a period of heightened geopolitical tensions, supporting Soviet military intelligence.

## Body
### Launch Details
- **Date/Time**: March 1, 1973, at 12:40:02 UTC.
- **Launch Site**: Plesetsk Cosmodrome Site 41 (a remote facility in northwestern Russia).
- **Rocket**: Voskhod (a modified R-7 rocket with a proven track record in satellite launches).

### Satellite Specifications
- **Class**: Zenit-4MK, a fourth-generation photoreconnaissance satellite.
- **SCN/COSPAR ID**: 06376 / 1973-011A (unique identifiers for tracking and cataloging).
- **Mission Duration**: Typical Zenit-4MK missions lasted approximately 14 days, after which the satellite's film capsule was recovered mid-air.

### Mission Context
- **Purpose**: To capture high-resolution imagery of strategic sites, such as military installations and infrastructure, using film cameras.
- **Orbit**: Likely placed into a low Earth orbit (LEO) with a high inclination to ensure coverage of key regions.
- **Recovery**: The satellite's film canister was ejected and parachuted back to Earth for retrieval by Soviet forces.

### Legacy
- **Series Contribution**: The Zenit-4MK series, including Cosmos 550, formed the backbone of Soviet reconnaissance efforts in the 1970s.
- **Technological Continuity**: Built on advancements from earlier Zenit models, emphasizing incremental improvements in camera resolution and orbital mechanics.
- **Historical Significance**: Reflects the Soviet Union's reliance on space-based assets to offset gaps in conventional intelligence-gathering capabilities.

## References

1. Jonathan's Space Report