# SAMOS 5

> American reconnaissance satellite

**Wikidata**: [Q5427251](https://www.wikidata.org/wiki/Q5427251)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/FTV-2203)  
**Source**: https://4ort.xyz/entity/samos-5

## Summary
SAMOS 5 was an American reconnaissance satellite launched on December 22, 1961, from Vandenberg Space Launch Complex 3 using an Atlas-Agena B launch vehicle. It was part of the SAMOS (Satellite and Missile Observation System) program designed for covert intelligence collection. The satellite re-entered Earth's atmosphere on December 31, 1961.

## Key Facts
- Launched on December 22, 1961, from Vandenberg Space Launch Complex 3
- Used Atlas-Agena B expendable launch system
- Classified as a reconnaissance satellite for intelligence and military applications
- COSPAR ID: 1961-035A
- Also known as FTV-2203
- Re-entered Earth's atmosphere on December 31, 1961
- Preceded by SAMOS 4, which was lost in a launch failure
- Part of the broader SAMOS program for satellite and missile observation

## FAQs
### Q: What was the purpose of SAMOS 5?
A: SAMOS 5 was an American reconnaissance satellite designed to covertly collect data for intelligence and military applications as part of the SAMOS program.

### Q: When and how was SAMOS 5 launched?
A: SAMOS 5 was launched on December 22, 1961, from Vandenberg Space Launch Complex 3 using an Atlas-Agena B launch vehicle.

### Q: How long did SAMOS 5 remain in orbit?
A: SAMOS 5 remained in orbit for approximately nine days before re-entering Earth's atmosphere on December 31, 1961.

## Why It Matters
SAMOS 5 represented a critical advancement in Cold War-era reconnaissance capabilities, providing the United States with orbital intelligence-gathering capacity during a period of intense geopolitical tension. As part of the SAMOS program, it demonstrated the feasibility of using satellites for military and intelligence purposes, laying groundwork for future generations of reconnaissance satellites that would become essential tools for national security. The program's development marked a shift from purely experimental space efforts to practical applications of satellite technology for strategic advantage. Despite its relatively short orbital lifetime, SAMOS 5 contributed to the evolving understanding of satellite operations, orbital mechanics, and the technical challenges of maintaining and recovering reconnaissance assets in space.

## Notable For
- First successful SAMOS satellite launch following the failure of SAMOS 4
- Demonstrated Atlas-Agena B launch system's capability for reconnaissance missions
- Contributed to the development of orbital reconnaissance technology during the Cold War
- Part of the pioneering SAMOS program that established satellite-based intelligence collection
- Provided valuable operational experience for subsequent reconnaissance satellite programs

## Body
### Technical Specifications and Launch Details
SAMOS 5 was launched on December 22, 1961, at 16:12 UTC from Vandenberg Space Launch Complex 3, located in California. The launch vehicle was an Atlas-Agena B, a two-stage expendable launch system consisting of an Atlas missile as the first stage and an Agena B upper stage. This configuration was specifically developed to support the SAMOS program's requirements for placing reconnaissance satellites into polar orbit.

### Program Context and Classification
The satellite was classified as a reconnaissance satellite, falling under the broader category of satellites that covertly collect data for intelligence or military applications. The SAMOS program, which stood for Satellite and Missile Observation System, was a classified U.S. Air Force initiative aimed at developing satellite-based reconnaissance capabilities during the early 1960s. SAMOS 5 was designated with the alternate name FTV-2203, likely indicating its role in the broader test and evaluation program.

### Orbital Operations and Mission Duration
SAMOS 5 achieved orbit following its successful launch and operated for approximately nine days before atmospheric re-entry occurred on December 31, 1961. The satellite's relatively short operational lifetime reflects the technical limitations of early reconnaissance satellites, including power constraints, thermal management challenges, and the absence of sophisticated station-keeping capabilities that would characterize later generations of military satellites.

### Program Development and Historical Context
SAMOS 5 followed SAMOS 4, which had been lost in a launch failure, marking an important milestone in the program's development. The successful launch and operation of SAMOS 5 provided valuable data and experience that would inform subsequent reconnaissance satellite programs, including the Corona program and later generations of imaging reconnaissance satellites. The program operated during a critical period of the Cold War when space-based intelligence capabilities were emerging as essential tools for national security and strategic planning.

## References

1. Jonathan's Space Report