# Kosmos 186

> uncrewed docking test of the Soyuz 7K-OK spacecraft

**Wikidata**: [Q545509](https://www.wikidata.org/wiki/Q545509)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Kosmos_186_and_Kosmos_188)  
**Source**: https://4ort.xyz/entity/kosmos-186

## Summary
Kosmos 186 was an uncrewed Soviet space mission and docking test of the Soyuz 7K-OK spacecraft, launched in 1967 as part of the Soyuz programme. It marked a critical step toward automated space rendezvous and docking capabilities. The mission successfully demonstrated docking with its counterpart, Kosmos 188.

## Key Facts
- Launched on October 27, 1967, from Baikonur Cosmodrome Site 31.
- Part of the Soyuz programme under the Soviet space program.
- Spacecraft: Soyuz 7K-OK; launch vehicle: Soyuz rocket.
- Mission duration: 5,690 minutes (~94.8 hours).
- Orbital period: 88.7 minutes; inclination: 51.7 degrees.
- Apoapsis: 212 km; periapsis: 172 km (Earth-relative).
- Mass at takeoff: 6,530 kilograms.
- Docked with Kosmos 188 during flight.
- Landed on October 31, 1967.
- COSPAR ID: 1967-105A; SCN: 03014.

## FAQs
### Q: What was the purpose of Kosmos 186?
A: Kosmos 186 was an uncrewed docking test to validate the automated rendezvous and docking systems of the Soyuz 7K-OK spacecraft. It was essential for future crewed missions and space station operations.

### Q: When was Kosmos 186 launched?
A: Kosmos 186 was launched on October 27, 1967, at 09:29:59 UTC from the Baikonur Cosmodrome.

### Q: Did Kosmos 186 complete its mission successfully?
A: Yes, Kosmos 186 successfully docked with Kosmos 188, demonstrating key technologies needed for future Soviet space missions, including those involving space stations like Salyut and Mir.

## Why It Matters
Kosmos 186 played a pivotal role in advancing spaceflight technology within the Soviet Union. As one of the early uncrewed tests of the Soyuz spacecraft’s docking system, it laid the groundwork for complex missions such as crewed lunar attempts, space station resupply, and long-term human presence in orbit. Its success validated the engineering behind automated rendezvous procedures, which became standard in later programs including the ISS era. Without missions like Kosmos 186, the evolution of modular space architecture and international cooperation in orbit would have been significantly delayed.

## Notable For
- First successful uncrewed docking between two Soyuz 7K-OK spacecraft (with Kosmos 188).
- Demonstrated feasibility of automated docking systems crucial for future space stations.
- One of the earliest missions in the Soyuz programme, helping establish operational protocols.
- Provided valuable flight data for improving subsequent Soyuz designs.
- Conducted entirely without human crew, reducing risk while testing critical systems.

## Body
### Mission Overview
Kosmos 186 was an uncrewed docking test conducted by the Soviet Union using the Soyuz 7K-OK spacecraft. It launched on October 27, 1967, alongside its twin, Kosmos 188, to demonstrate automated rendezvous and docking capabilities—technologies vital for future missions involving space stations and lunar exploration.

### Launch and Orbit
- **Launch Date**: October 27, 1967
- **Launch Time**: 09:29:59 UTC
- **Launch Site**: Baikonur Cosmodrome, Site 31
- **Launch Vehicle**: Soyuz rocket
- **Orbital Inclination**: 51.7°
- **Orbital Period**: 88.7 minutes
- **Periapsis**: 172 km
- **Apoapsis**: 212 km

The spacecraft entered low Earth orbit and began maneuvers to approach and dock with Kosmos 188, simulating tasks required for crewed missions and station logistics.

### Docking Test
- **Target Vehicle**: Kosmos 188
- **Outcome**: Successful automated docking
- **Significance**: Proved viability of Soyuz's APAS (Androgynous Peripheral Attach System) docking mechanism
- **Mission Duration**: 5,690 minutes (~94.8 hours)

This achievement was foundational for future missions requiring reliable cargo delivery and crew transfers to orbital platforms like Salyut and later the International Space Station.

### Technical Specifications
- **Spacecraft Class**: Soyuz 7K-OK
- **Mass (Takeoff)**: 6,530 kg
- **Operator**: Soviet space program
- **COSPAR ID**: 1967-105A
- **SCN Number**: 03014

These parameters reflect the early configuration of the Soyuz spacecraft before upgrades introduced in later variants used today.

### Landing and Conclusion
- **Landing Date**: October 31, 1967
- **Mission Status**: Completed successfully
- **Legacy**: Validated core technologies now integral to modern human spaceflight

Kosmos 186 remains a milestone in space history, representing both technological innovation and strategic progress in the Cold War-era space race.

## References

1. Jonathan's Space Report
2. Freebase Data Dumps. 2013