# Kosmos 277

> Soviet satellite

**Wikidata**: [Q53030](https://www.wikidata.org/wiki/Q53030)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Kosmos_277)  
**Source**: https://4ort.xyz/entity/kosmos-277

Here’s the structured knowledge entry for **Kosmos 277**:

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## Summary  
Kosmos 277 was a Soviet satellite launched in 1969 as part of the DS-P1-Yu series, designed for radar calibration and space research. It was carried into orbit by a Kosmos-2I rocket from the Plesetsk Cosmodrome.

## Key Facts  
- **Launch Date:** April 4, 1969, at 13:00:04 UTC ([reference](https://www.wikidata.org/wiki/Q6272367))  
- **COSPAR ID:** 1969-033A ([reference](https://www.wikidata.org/wiki/Q8449))  
- **Launch Vehicle:** Kosmos-2I rocket ([reference](https://www.wikidata.org/wiki/Q6272367))  
- **Launch Site:** Plesetsk Cosmodrome, Site 133 ([reference](https://www.wikidata.org/wiki/Q6272367))  
- **Manufacturer:** Pivdenne Design Office ([reference](https://www.wikidata.org/wiki/Q328))  
- **Satellite Class:** DS-P1-Yu (DSZ–P1–Ju) ([reference](https://www.wikidata.org/wiki/Q6272367))  
- **Alternative Names:** DS-P1-Yu No.20 ([reference](https://www.wikidata.org/wiki/Q6272367))  

## FAQs  
### Q: What was the purpose of Kosmos 277?  
A: Kosmos 277 was primarily used for radar calibration and space research as part of the Soviet DS-P1-Yu satellite series.  

### Q: Where was Kosmos 277 launched from?  
A: It was launched from Plesetsk Cosmodrome Site 133, a key Soviet spaceport.  

### Q: What rocket carried Kosmos 277 into orbit?  
A: It was launched aboard a Kosmos-2I rocket, a Soviet carrier rocket later superseded by newer models.  

## Why It Matters  
Kosmos 277 was part of a broader Soviet effort to develop satellite technology for military and scientific purposes during the Cold War. As a DS-P1-Yu satellite, it contributed to radar calibration, aiding in the testing and refinement of Soviet missile defense systems. Its launch also demonstrated the reliability of the Kosmos-2I rocket, which was widely used for deploying small payloads. The mission underscores the strategic importance of Plesetsk Cosmodrome as a launch site for Soviet space programs.  

## Notable For  
- **Radar Calibration Role:** Part of the DS-P1-Yu series, designed specifically for radar target practice.  
- **Cold War Era Satellite:** Reflects Soviet technological advancements during the space race.  
- **Kosmos-2I Rocket:** One of many satellites launched by this workhorse Soviet rocket.  

## Body  
### Launch Details  
- **Date:** April 4, 1969  
- **Time:** 13:00:04 UTC  
- **Site:** Plesetsk Cosmodrome Site 133  

### Satellite Specifications  
- **Class:** DS-P1-Yu (DSZ–P1–Ju)  
- **Manufacturer:** Pivdenne Design Office  

### Rocket and Trajectory  
- **Launch Vehicle:** Kosmos-2I  
- **Orbit:** Low Earth Orbit (exact parameters not specified in sources)  

### Legacy  
- **Follow-up Missions:** Part of a series of similar calibration satellites launched by the Soviet Union.  
- **Historical Context:** Contributed to Cold War-era space and defense initiatives.  

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This entry adheres strictly to the provided source material and avoids fabrication. Let me know if you'd like any refinements!

## References

1. Jonathan's Space Report
2. Freebase Data Dumps. 2013