# Cosmos 1691
**Wikidata**: [Q12753401](https://www.wikidata.org/wiki/Q12753401)  
**Source**: https://4ort.xyz/entity/cosmos-1691

## Summary
Cosmos 1691 (also Kosmos 1691) is a Strela-3 military communications satellite launched on 1985-10-09. It was placed into orbit by a Tsyklon-3 rocket from Plesetsk Cosmodrome Site 32, with a recorded launch time of 21:35:00 on 1985-10-09.

## Key Facts
- Satellite name/alias: Cosmos 1691 (also written Kosmos 1691).
- Satellite Catalog Number (scn): 16139.
- COSPAR ID: 1985-094B.
- Instance of: Strela-3 class (a Ukrainian military communications satellite design).
- Launch date: 1985-10-09.
- Recorded launch time: 21:35:00 on 1985-10-09 (as a significant event).
- Launch vehicle: Tsyklon-3.
- Launch site / start point: Plesetsk Cosmodrome Site 32.
- Wolfram Language entity code: Entity["Satellite", "16139"].
- Wikipedia language entries exist in Macedonian (mk), Serbo-Croatian (sh), and Serbian (sr); sitelink_count: 3.

## FAQs
### Q: What is Cosmos 1691?
A: Cosmos 1691 is a Strela-3 class military communications satellite (also written Kosmos 1691) identified by COSPAR ID 1985-094B and Satellite Catalog Number 16139.

### Q: When and how was Cosmos 1691 launched?
A: Cosmos 1691 was launched on 1985-10-09 by a Tsyklon-3 launch vehicle from Plesetsk Cosmodrome Site 32. The recorded launch time for the associated rocket launch event is 21:35:00 on 1985-10-09.

### Q: What type of satellite is Strela-3?
A: Strela-3 is a class of Ukrainian military communications satellites. Cosmos 1691 is recorded as an instance of the Strela-3 class.

### Q: Where can I find more indexed identifiers for Cosmos 1691?
A: Key identifiers include COSPAR ID 1985-094B, Satellite Catalog Number 16139, and the Wolfram Language entity Entity["Satellite", "16139"].

## Why It Matters
Cosmos 1691 is part of the Strela-3 series, a family of satellites designed for military communications. As an instance of that class, Cosmos 1691 contributed to the communications infrastructure that supports military messaging and data relay needs for its operators. The launch details—use of a Tsyklon-3 rocket and Plesetsk Cosmodrome Site 32—place the satellite within the operational practices and launch logistics of its time. Its recorded COSPAR ID and satellite catalog number provide stable identifiers used by tracking organizations, researchers, and cataloguers to reference the satellite in cross-disciplinary datasets. The existence of Wikipedia entries in multiple languages and a Wolfram Language entity code indicates that Cosmos 1691 is cataloged across reference systems and is accessible for lookup in technical and public information repositories. For historical studies of space-based military communications or analyses of Tsyklon-3 launch activity from Plesetsk in 1985, Cosmos 1691 serves as a verifiable data point.

## Notable For
- Being an instance of the Strela-3 military communications satellite class.
- Launch on 1985-10-09 by a Tsyklon-3 rocket from Plesetsk Cosmodrome Site 32.
- Assigned COSPAR ID 1985-094B and Satellite Catalog Number 16139.
- Presence in multiple public reference systems (Wolfram entity code and Wikipedia entries in mk/sh/sr).

## Body
### Overview
- Name: Cosmos 1691 (alias Kosmos 1691).
- Classification: Recorded as an instance of the Strela-3 class, a Ukrainian military communications satellite design.
- Primary identifiers: COSPAR ID 1985-094B; Satellite Catalog Number 16139.

### Launch details
- Launch date: 1985-10-09.
- Recorded launch time: 21:35:00 on 1985-10-09 (listed as a significant event).
- Launch vehicle: Tsyklon-3.
- Launch site / start point: Plesetsk Cosmodrome Site 32.
- Significant event entry associates the rocket launch with Plesetsk Cosmodrome Site 32 and the point in time 1985-10-09.

### Classification and role
- Instance_of property: Strela-3 class.
- Strela-3 is described in the source material as a type of Ukrainian military communications satellite.
- Cosmos 1691 is therefore cataloged as a military communications satellite within that class.

### Identifiers and references
- scn: 16139 (Satellite Catalog Number).
- COSPAR ID: 1985-094B.
- Wolfram Language entity: Entity["Satellite", "16139"].
- Wikipedia language entries available in Macedonian (mk), Serbo-Croatian (sh), and Serbian (sr); sitelink_count = 3.

### Related items
- Strela-3 class — the satellite class to which Cosmos 1691 belongs.
- Tsyklon-3 class — the expendable launch vehicle used to place Cosmos 1691 into orbit.

### Metadata
- sitelink_count: 3.
- Known structured-data references in the source trace to a single reference group (P248: Q6272367) for many properties.

## References

1. Jonathan's Space Report