# Tselina-OK

> model of Soviet signals intelligence satellite

**Wikidata**: [Q14701646](https://www.wikidata.org/wiki/Q14701646)  
**Source**: https://4ort.xyz/entity/tselina-ok

## Summary
Tselina-OK is a model of Soviet signals intelligence satellite, part of the larger Tselina family of satellites designed for intelligence gathering. It was based on the Tselina-O model and first flew on November 21, 1975. The satellite was developed by the Soviet Union and manufactured by Pivdenne Design Office and TsNIRTI, with the latter responsible for the payload.

## Key Facts
- **Class**: Signals intelligence satellite
- **Part of**: Tselina family of satellites
- **Based on**: Tselina-O model
- **First flight**: November 21, 1975
- **Manufacturer**: Pivdenne Design Office (main), TsNIRTI (payload)
- **Country of origin**: Soviet Union
- **Aliases**: Zelina-OK
- **Instance of**: Spacecraft model
- **Subclass of**: Signals intelligence satellite

## FAQs
### Q: What was the primary purpose of Tselina-OK?
A: Tselina-OK was a Soviet signals intelligence satellite designed for military intelligence gathering, part of the broader Tselina family of satellites.

### Q: Who developed Tselina-OK?
A: Tselina-OK was developed by Pivdenne Design Office and TsNIRTI, with TsNIRTI responsible for the payload.

### Q: When was Tselina-OK first launched?
A: Tselina-OK first flew on November 21, 1975.

### Q: What is the relationship between Tselina-OK and Tselina-O?
A: Tselina-OK was based on the Tselina-O model, indicating a direct lineage in design and development.

### Q: Which other satellites are related to Tselina-OK?
A: Tselina-OK is related to Cosmos 1008, Cosmos 781, and Cosmos 924, which are also part of the Tselina family.

## Why It Matters
Tselina-OK played a crucial role in the Soviet Union's signals intelligence capabilities, contributing to the broader Tselina satellite family. As a signals intelligence satellite, it was designed to gather intelligence by intercepting electronic signals, a critical function in military and national security. The satellite's development and deployment were part of the Soviet Union's broader space-based intelligence network, reflecting the era's advancements in space technology for strategic purposes. Its first flight in 1975 marked an important milestone in the Soviet space program's intelligence-gathering efforts.

## Notable For
- **First flight**: November 21, 1975, marking a significant date in Soviet signals intelligence satellite operations.
- **Payload development**: TsNIRTI was responsible for the payload, highlighting the institute's role in satellite intelligence systems.
- **Family lineage**: Based on Tselina-O, Tselina-OK continued the development of the Tselina series, ensuring continuity in design and functionality.
- **Military significance**: As part of the Tselina family, Tselina-OK contributed to the Soviet Union's military intelligence capabilities, particularly in signal interception.

## Body
### Classification and Function
Tselina-OK is classified as a signals intelligence satellite, a type of military satellite focused on intelligence gathering. It is part of the Tselina family, which includes other models like Tselina-O. The satellite was designed to intercept and analyze electronic signals, a critical function for military and national security.

### Development and Manufacture
Tselina-OK was developed by Pivdenne Design Office, with TsNIRTI responsible for the payload. TsNIRTI, or the Soviet/Russian research institute, played a key role in the development of the satellite's intelligence-gathering capabilities. The satellite's first flight occurred on November 21, 1975, marking an important date in the Soviet space program's intelligence operations.

### Related Satellites
Tselina-OK is related to several other satellites, including Cosmos 1008, Cosmos 781, and Cosmos 924. These satellites are also part of the Tselina family and share similar functions and design principles. The relationships between these satellites highlight the broader network of Soviet signals intelligence satellites.

### Country of Origin and Legacy
Tselina-OK was developed by the Soviet Union, reflecting the country's advancements in space technology for military purposes. The satellite's development and deployment were part of the broader Tselina family, which continued to evolve and contribute to the Soviet Union's intelligence capabilities. The satellite's legacy continues to be studied and analyzed in the context of Soviet space programs and military intelligence.

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## References

1. [Source](https://space.skyrocket.de/doc_sdat/tselina-o.htm)
2. Jonathan's Space Report