# Yantar-4KS1

> Soviet spy satellite

**Wikidata**: [Q4538278](https://www.wikidata.org/wiki/Q4538278)  
**Source**: https://4ort.xyz/entity/yantar-4ks1

## Summary
Yantar-4KS1 was a Soviet spy satellite developed by the Progress State Research and Production Rocket Space Center, part of the Yantar series of reconnaissance satellites. It was operational from 1982 to 1991 and was used for covert intelligence gathering, primarily by the GRU.

## Key Facts
- **Class**: Reconnaissance satellite
- **Series**: Part of the Yantar series of Soviet/Russian spy satellites
- **Operator**: GRU (Soviet military intelligence)
- **Developer**: Progress State Research and Production Rocket Space Center
- **Manufacturer**: Arsenal Design Bureau
- **Power Source**: Spacecraft solar array (2 units)
- **Service Entry**: December 28, 1982
- **Service Retirement**: 1991
- **Country of Origin**: Soviet Union
- **Aliases**: Terilen, 11F694, Терилен
- **Grau Index**: 11Ф694
- **Predecessor**: Yantar-4K2
- **Successor**: Yantar-4KS1M

## FAQs
### Q: What was the Yantar-4KS1 used for?
A: The Yantar-4KS1 was a Soviet spy satellite designed for reconnaissance, collecting intelligence data for military applications.

### Q: Who operated the Yantar-4KS1?
A: The satellite was operated by the GRU, the Soviet military intelligence agency.

### Q: When was the Yantar-4KS1 in service?
A: The satellite was operational from December 28, 1982, until 1991.

### Q: What was the successor to the Yantar-4KS1?
A: The Yantar-4KS1 was succeeded by the Yantar-4KS1M.

### Q: What was the predecessor to the Yantar-4KS1?
A: The Yantar-4K2 was the predecessor to the Yantar-4KS1.

## Why It Matters
The Yantar-4KS1 played a crucial role in Soviet military intelligence by providing reconnaissance data for the GRU. As part of the Yantar series, it was designed to operate in low Earth orbit, capturing high-resolution imagery and other intelligence data. Its development and operation were part of the broader Soviet space program, which aimed to enhance national security through advanced satellite technology. The satellite's service from 1982 to 1991 highlights its significance during the Cold War era, contributing to the Soviet Union's capabilities in space-based reconnaissance.

## Notable For
- **Part of the Yantar Series**: The Yantar-4KS1 was a key member of the Yantar series, which included other reconnaissance satellites like the Yantar-4K2 and Yantar-4KS1M.
- **GRU Operation**: Operated by the GRU, the satellite was integral to Soviet military intelligence efforts.
- **Solar Powered**: Equipped with a spacecraft solar array, ensuring continuous power for its missions.
- **Cold War Era**: Operated during the peak of the Cold War, providing critical intelligence data.
- **Successor to Yantar-4K2**: The Yantar-4KS1 succeeded the Yantar-4K2, marking an evolution in Soviet reconnaissance satellite technology.

## Body
### Classification and Series
The Yantar-4KS1 is classified as a reconnaissance satellite, part of the broader Yantar series. This series was developed by the Soviet Union for intelligence gathering, with the Yantar-4KS1 being a specific model within the lineup.

### Development and Operation
Developed by the Progress State Research and Production Rocket Space Center and manufactured by the Arsenal Design Bureau, the Yantar-4KS1 was operated by the GRU. It entered service on December 28, 1982, and remained in operation until 1991.

### Technical Specifications
The satellite was powered by a spacecraft solar array, with two units providing the necessary energy for its operations. It was assigned the Grau Index 11Ф694 and had the aliases Terilen and Терилен.

### Predecessor and Successor
The Yantar-4KS1 succeeded the Yantar-4K2 and was succeeded by the Yantar-4KS1M, indicating a progression in Soviet reconnaissance satellite technology.

### Related Missions
Several missions were associated with the Yantar-4KS1, including Cosmos 1426, Cosmos 1731, Cosmos 1810, and others, all of which contributed to the satellite's intelligence-gathering capabilities.

## Schema Markup
```json
{
  "@context": "https://schema.org",
  "@type": "Thing",
  "name": "Yantar-4KS1",
  "description": "Soviet spy satellite part of the Yantar series, operated by the GRU from 1982 to 1991.",
  "sameAs": ["https://www.wikidata.org/wiki/Q123456789", "https://en.wikipedia.org/wiki/Yantar-4KS1"],
  "additionalType": "Spacecraft"
}

## References

1. [Source](https://space.skyrocket.de/doc_sdat/yantar-4ks1.htm)