# Oko

> family of Soviet and Russian early warning satellites

**Wikidata**: [Q2017382](https://www.wikidata.org/wiki/Q2017382)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Oko)  
**Source**: https://4ort.xyz/entity/oko

## Summary
Oko is a family of Soviet and Russian early warning satellites designed to detect ballistic missile launches. Part of a broader network of space-based surveillance systems, Oko satellites played a critical role in national defense by providing advance warning of potential missile threats.

## Key Facts
- Oko is a **spacecraft family** classified as an **early warning satellite**, specifically for ballistic missile detection.
- It includes **three main subclasses**: US-K, US-KS, and US-KMO, each representing different generations or variants.
- The system was **replaced by EKS Kupol**, a newer Russian early warning satellite system.
- Individual satellites in the Oko family include **Kosmos 862** and **Kosmos 2340**, both military early warning satellites.
- The program is **distinct from** a descriptive page or disambiguation page named "Oko" (per Wikidata qualifiers).
- Oko satellites are part of a **Soviet and Russian legacy** in space-based missile defense.
- The system has **11 sitelinks** across multiple languages on Wikipedia (e.g., English, German, French).

## FAQs
### Q: What is the purpose of the Oko satellite system?
A: Oko is a family of early warning satellites designed to detect ballistic missile launches, providing critical advance notice for defense systems.

### Q: What are the main types of Oko satellites?
A: The Oko family includes three main subclasses: **US-K**, **US-KS**, and **US-KMO**, each with variations in capabilities and design.

### Q: Is the Oko system still in use today?
A: No, Oko has been **replaced by the EKS Kupol system**, a newer generation of Russian early warning satellites.

### Q: Are there notable individual satellites in the Oko program?
A: Yes, examples include **Kosmos 862** and **Kosmos 2340**, both military early warning satellites launched under the program.

### Q: How does Oko differ from other early warning systems?
A: Oko is specifically a **Soviet/Russian** system, distinct from Western counterparts like the U.S. Defense Support Program (DSP).

## Why It Matters
Oko represents a pivotal advancement in **space-based missile defense**, enabling real-time detection of ballistic missile launches during the Cold War and beyond. By providing early warning capabilities, the system enhanced strategic stability and deterrence, allowing military and political leaders to respond to potential threats. Its development reflects the **space race’s military dimension**, where satellites became essential for national security. Though superseded by modern systems like EKS Kupol, Oko’s legacy underscores the importance of **orbital surveillance** in global defense architectures. The program also highlights Russia’s long-standing expertise in **space-based early warning technology**, a capability that remains critical in contemporary geopolitical tensions.

## Notable For
- **First-generation Soviet early warning satellites**: Oko was among the earliest space-based systems designed for missile detection.
- **Multi-variant design**: The US-K, US-KS, and US-KMO subclasses allowed for evolutionary improvements in sensor technology and orbital coverage.
- **Cold War strategic role**: Oko satellites were a key component of the USSR’s **nuclear deterrence posture**, monitoring missile activity from adversaries.
- **Precursor to modern systems**: The program laid the groundwork for Russia’s current **EKS Kupol** early warning constellation.
- **High-altitude surveillance**: Operated in **geostationary and highly elliptical orbits** to maximize coverage of potential launch sites.

## Body
### Overview and Classification
Oko is a **spacecraft family** under the broader category of **early warning satellites**, specifically optimized for **ballistic missile detection**. It is classified as a **subclass of early warning satellites** and is distinct from other space-based surveillance systems.

### Subclasses and Variants
The Oko family comprises three primary subclasses:
- **US-K**: The foundational series of Soviet early warning satellites.
- **US-KS**: A later variant with improved capabilities.
- **US-KMO**: An advanced iteration, likely featuring enhanced sensors or orbital parameters.

### Individual Satellites
Notable satellites launched under the Oko program include:
- **Kosmos 862**: A Russian military early warning satellite.
- **Kosmos 2340**: Another military satellite in the same role, part of the later US-KMO series.

### Operational Replacement
Oko was **phased out** in favor of the **EKS Kupol** system, which represents the next generation of Russian early warning satellites with modernized technology.

### Technical and Orbital Characteristics
While specific technical details (e.g., sensor types, resolution) are not provided in the source material, Oko satellites were designed to operate in **geostationary orbit (GEO)** and **highly elliptical orbit (HEO)** to ensure comprehensive coverage of missile launch zones.

### Historical Context
Developed during the **Cold War**, Oko was part of the USSR’s efforts to counter U.S. and NATO missile capabilities. Its deployment reflected the **militarization of space**, where satellites became critical assets for **strategic early warning**.

### Wikidata and External References
- **Wikidata ID**: Q15241312 (Freebase ID: /m/03cftn1).
- **Wikipedia coverage**: Available in 10 languages, including English, German, and French.
- **Encyclopedia of China (3rd Edition) IDs**: 401911, 68081 (indicating international recognition in reference works).

## Schema Markup
```json
{
  "@context": "https://schema.org",
  "@type": "Thing",
  "name": "Oko",
  "description": "Family of Soviet and Russian early warning satellites designed for ballistic missile detection.",
  "sameAs": [
    "https://www.wikidata.org/wiki/Q15241312",
    "https://en.wikipedia.org/wiki/Oko"
  ],
  "additionalType": "SpacecraftFamily"
}

## References

1. Freebase Data Dumps. 2013