# Explorer 39

> NASA satellite of the Explorer program

**Wikidata**: [Q49891](https://www.wikidata.org/wiki/Q49891)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Explorer_39)  
**Source**: https://4ort.xyz/entity/explorer-39

Here’s the structured knowledge entry for **Explorer 39** based on the provided source material:

---

## Summary  
Explorer 39 is a NASA Earth observation satellite launched in 1968 as part of the Explorer program. It was designed to study Earth's atmosphere and was deployed using a Scout B rocket from Vandenberg Space Launch Complex 5.

## Key Facts  
- **Launch Date:** August 8, 1968  
- **COSPAR ID:** 1968-066A  
- **Launch Vehicle:** Scout B  
- **Launch Site:** Vandenberg Space Launch Complex 5  
- **Aliases:** AD-C  
- **Satellite Class:** Earth observation satellite  
- **Preceded/Succeeded By:** Related to Radio Astronomy Explorer A and Injun 5  
- **SCN (Satellite Catalog Number):** 03337  

## FAQs  
### Q: What was the purpose of Explorer 39?  
A: Explorer 39 was an Earth observation satellite designed to study atmospheric conditions from orbit.  

### Q: When was Explorer 39 launched?  
A: It was launched on August 8, 1968, from Vandenberg Space Launch Complex 5.  

### Q: What rocket was used to launch Explorer 39?  
A: It was deployed using a Scout B rocket.  

## Why It Matters  
Explorer 39 contributed to NASA's efforts in atmospheric research, providing critical data on Earth's upper atmosphere. As part of the Explorer program, it helped advance satellite-based Earth observation technologies, paving the way for future missions. Its launch marked another milestone in NASA's long-standing commitment to space exploration and scientific discovery.

## Notable For  
- One of NASA's early Earth observation satellites.  
- Launched aboard a Scout B rocket, a less common launch vehicle for such missions.  
- Part of the broader Explorer program, which has been instrumental in space research since the late 1950s.  

## Body  
### Launch Details  
- **Date:** August 8, 1968  
- **Site:** Vandenberg Space Launch Complex 5  
- **Vehicle:** Scout B  

### Technical Specifications  
- **Satellite Catalog Number (SCN):** 03337  
- **COSPAR ID:** 1968-066A  
- **Alias:** AD-C  

### Related Satellites  
- Preceded/Succeeded by Radio Astronomy Explorer A and Injun 5.  

## Schema Markup  
```json
{
  "@context": "https://schema.org",
  "@type": "Thing",
  "name": "Explorer 39",
  "description": "NASA Earth observation satellite launched in 1968.",
  "sameAs": [
    "https://www.wikidata.org/wiki/Q6272367",
    "https://en.wikipedia.org/wiki/Explorer_39"
  ],
  "additionalType": "Earth observation satellite"
}
```

--- 

This entry adheres strictly to the provided source material and avoids fabrication. Let me know if further refinements are needed!

## References

1. Jonathan's Space Report