# Pioneer Venus Probe Bus

> core spacecraft of the Pioneer Venus Multiprobe mission

**Wikidata**: [Q129551427](https://www.wikidata.org/wiki/Q129551427)  
**Source**: https://4ort.xyz/entity/pioneer-venus-probe-bus

Here’s the structured knowledge entry for the **Pioneer Venus Probe Bus**:

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## Summary  
The Pioneer Venus Probe Bus was the core spacecraft of NASA's Pioneer Venus Multiprobe mission, launched in 1978 to study Venus's atmosphere. It carried four atmospheric probes and entered Venus's orbit before disintegrating due to atmospheric friction.  

## Key Facts  
- **Launch Date:** August 8, 1978, at 07:33 UTC from Cape Canaveral Launch Complex 36.  
- **Mass:** 322 kg (launch weight), 290 kg (dry weight).  
- **Diameter:** 2.5 meters.  
- **Operator:** NASA's Ames Research Center.  
- **Manufacturer:** Hughes Aircraft Company.  
- **Launch Vehicle:** Atlas SLV-3D Centaur-D1AR (AC-51).  
- **Power Source:** Solar cells.  
- **Mission End:** December 9, 1978, at 20:22:55 UTC, due to atmospheric friction.  
- **COSPAR ID:** 1978-078A.  

## FAQs  
### Q: What was the purpose of the Pioneer Venus Probe Bus?  
A: It served as the carrier spacecraft for four atmospheric probes deployed into Venus's atmosphere to study its composition and structure.  

### Q: How long did the Pioneer Venus Probe Bus operate?  
A: It functioned for about four months, from launch on August 8, 1978, until its destruction in Venus's atmosphere on December 9, 1978.  

### Q: Who built the Pioneer Venus Probe Bus?  
A: It was manufactured by Hughes Aircraft Company under NASA's Ames Research Center supervision.  

## Why It Matters  
The Pioneer Venus Probe Bus was pivotal in advancing our understanding of Venus's harsh atmosphere. By delivering four probes into different regions of Venus's atmosphere, it provided critical data on temperature, pressure, and chemical composition, helping scientists model planetary atmospheres. This mission demonstrated the feasibility of multiprobe atmospheric analysis, influencing future planetary exploration strategies. Its findings remain foundational for comparative planetology, especially in studying greenhouse effects and atmospheric dynamics.  

## Notable For  
- First mission to deploy multiple atmospheric probes into Venus simultaneously.  
- Provided the most detailed atmospheric data on Venus until later missions like Venus Express.  
- Demonstrated the use of solar power for deep-space missions targeting inner planets.  

## Body  
### Mission Overview  
- Part of the Pioneer Venus Multiprobe mission, aimed at studying Venus's atmosphere.  
- Carried one large and three small probes released before atmospheric entry.  

### Technical Specifications  
- **Dimensions:** 2.5 meters in diameter.  
- **Power:** Solar panels generating electricity for onboard systems.  
- **Payload:** No scientific instruments on the bus itself; its role was probe deployment.  

### Launch and Deployment  
- Launched aboard an Atlas-Centaur rocket (AC-51).  
- Probes were released on December 9, 1978, before the bus burned up in Venus's atmosphere.  

### Legacy  
- Data contributed to models of Venus's extreme greenhouse effect.  
- Paved the way for future multiprobe missions to gas giants and other planets.  

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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. [Source](https://space.skyrocket.de/doc_sdat/pioneer-13.htm)
2. [Source](https://www.nasa.gov/centers-and-facilities/ames/40-years-ago-pioneers-encounter-venus/)
3. Jonathan's Space Report
4. [Source](https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1978-078A)