# Cosmos 1131
**Wikidata**: [Q12753122](https://www.wikidata.org/wiki/Q12753122)  
**Source**: https://4ort.xyz/entity/cosmos-1131

## Summary  
Cosmos 1131 (also written Kosmos 1131) is a Soviet‑era Strela‑1M communications satellite launched on 25 September 1979. It was placed into orbit from Plesetsk Cosmodrome using a Kosmos‑3M launch vehicle.

## Key Facts  
- **Satellite designation:** Cosmos 1131 (Kosmos 1131) – SCN 11539.  
- **Mission type:** Strela‑1M military communications satellite.  
- **Launch date and time:** 25 September 1979 at 21:00 UTC.  
- **Launch site:** Plesetsk Cosmodrome, Site 132, Russian Soviet Federative Socialist Republic.  
- **Launch vehicle:** Kosmos‑3M rocket, a workhorse of the Soviet space program.  
- **COSPAR ID:** 1979‑084B.  
- **Primary purpose:** Relay of secure, low‑Earth‑orbit communications for the Soviet armed forces.  
- **Related classes:** Part of the Strela‑1M satellite series; launched aboard a Kosmos‑3M rocket.  
- **Language coverage on Wikipedia:** Articles exist in Macedonian (mk), Serbo‑Croatian (sh) and Serbian (sr).  

## FAQs  

### Q: What was the primary function of Cosmos 1131?  
**A:** Cosmos 1131 was a Strela‑1M communications satellite designed to provide secure, low‑Earth‑orbit data relay for Soviet military users.

### Q: When and where was Cosmos 1131 launched?  
**A:** It launched on 25 September 1979 from Plesetsk Cosmodrome’s Site 132, using a Kosmos‑3M launch vehicle.

### Q: How is Cosmos 1131 identified in international satellite catalogs?  
**A:** It carries the COSPAR identifier 1979‑084B and the Satellite Catalog Number (SCN) 11539.

### Q: Which launch vehicle placed Cosmos 1131 into orbit?  
**A:** The satellite was carried aloft by a Kosmos‑3M rocket, a reliable two‑stage launch system used extensively by the Soviet Union.

### Q: Is Cosmos 1131 known by any other name?  
**A:** Yes, it is also listed as Kosmos 1131, a common transliteration of the Russian “Космос” designation.

## Why It Matters  
Cosmos 1131 represents a key element of the Soviet Union’s Cold‑War communications infrastructure. As part of the Strela‑1M series, it provided a low‑cost, rapid‑deployment solution for secure tactical data links, enabling command and control units to maintain contact across vast distances without reliance on ground‑based radio networks. The use of the Kosmos‑3M launch vehicle—a workhorse that delivered hundreds of payloads—illustrates the efficiency and scalability of Soviet launch operations. Understanding Cosmos 1131 helps illustrate how space‑based communications evolved from early experimental systems to operational constellations that underpin modern military and civilian networks. Its launch from Plesetsk, a northern site optimized for high‑inclination orbits, also highlights strategic choices in orbital mechanics that continue to influence satellite deployment today.

## Notable For  
- First‑generation Strela‑1M satellite providing secure military communications.  
- Launched from the high‑latitude Plesetsk Cosmodrome, enabling coverage of northern latitudes.  
- Utilized the reliable Kosmos‑3M launch vehicle, exemplifying Soviet launch efficiency.  
- Assigned the COSPAR ID 1979‑084B and SCN 11539, identifiers still used in contemporary tracking databases.  

## Body  

### Overview  
Cosmos 1131 (Kosmos 1131) is classified as an instance of the Strela‑1M satellite class. The Strela series was developed to furnish the Soviet armed forces with a low‑Earth‑orbit (LEO) communications relay capability, reducing dependence on terrestrial infrastructure.

### Launch Details  
- **Date & Time:** 25 September 1979, 21:00 UTC.  
- **Site:** Plesetsk Cosmodrome, Site 132, a launch complex dedicated to polar and high‑inclination missions.  
- **Vehicle:** Kosmos‑3M, a two‑stage liquid‑propellant rocket that had a proven record for delivering small to medium payloads into LEO.  

### Technical Identification  
- **COSPAR ID:** 1979‑084B – the international designator indicating the year, launch sequence, and payload identifier.  
- **Satellite Catalog Number (SCN):** 11539 – the numeric identifier used by tracking agencies such as NORAD.  
- **Wolfram Language Entity:** `Entity["Satellite", "11539"]`, enabling computational queries in Wolfram environments.  

### Mission Role  
The Strela‑1M platform operated as a store‑and‑forward communications node. It received encrypted messages from ground stations, stored them onboard, and retransmitted them to other nodes or ground terminals as the satellite passed overhead. This architecture provided near‑real‑time data exchange for mobile units, aircraft, and naval vessels.

### Related Systems  
- **Strela‑1M Class:** A series of similar satellites sharing bus architecture, power systems, and communication payloads.  
- **Kosmos‑3M Rocket:** Also used for launching other military, scientific, and civilian satellites, underscoring its versatility.  

### Legacy and Documentation  
Cosmos 1131 is documented in multiple language editions of Wikipedia (Macedonian, Serbo‑Croatian, Serbian) and appears in satellite tracking databases worldwide. Its operational data contribute to historical analyses of Soviet space capabilities and inform contemporary studies of LEO communications constellations.

## References

1. Jonathan's Space Report