# Apollo 8 SIVB

> The Apollo Saturn V SIVB was the third stage of the Saturn V booster.

**Wikidata**: [Q111912943](https://www.wikidata.org/wiki/Q111912943)  
**Source**: https://4ort.xyz/entity/apollo-8-sivb

## Summary
The Apollo 8 SIVB was the third stage of the Saturn V booster, specifically designed as the final stage of the Apollo program's launch vehicle that powered the spacecraft during its mission to orbit the Moon.

## Key Facts
- The Apollo 8 SIVB was the third stage of the Saturn V booster
- It has aliases including "Apollo 8 Saturn V third stage", "03627", and "Apollo8SIVB"
- Its COSPAR ID is 1968-118B
- Its NSSDCA ID is 1968-118B
- It is classified as a spacecraft
- The description identifies it as "The Apollo Saturn V SIVB was the third stage of the Saturn V booster"

## FAQs
- What is the Apollo 8 SIVB?  
  It was the third stage of the Saturn V booster used during the Apollo 8 mission, serving as the final stage of the launch vehicle that propelled the spacecraft to lunar orbit.
- What was its role in the Apollo program?  
  The SIVB acted as the third stage of the Saturn V rocket, providing the final thrust needed to send the Apollo 8 spacecraft into orbit around the Moon.
- What are its technical identifiers?  
  It has both a COSPAR ID (1968-118B) and an NSSDCA ID (1968-118B), which are standard space mission designations.

## Why It Matters
The Apollo 8 SIVB played a critical role in the early Apollo program by demonstrating the capability of the Saturn V rocket to reach lunar orbit. As the third stage of the most powerful launch vehicle ever built, it represented a technological achievement that enabled humanity's first journey to the Moon. Its successful operation during the Apollo 8 mission marked a pivotal moment in space exploration, proving the Saturn V's reliability and setting the stage for subsequent lunar landings.

## Notable For
- It was the final stage of the Saturn V rocket that powered the Apollo 8 mission
- It successfully propelled the Apollo 8 spacecraft into lunar orbit during the first human mission to the Moon
- It demonstrated the Saturn V's capability to achieve Earth-Moon transfer orbits
- It served as the foundation for subsequent Apollo missions that would land on the Moon

## Body
### History
The Apollo 8 SIVB was developed as part of NASA's Apollo program during the 1960s space race. It was the third stage of the Saturn V rocket, which became the most powerful launch vehicle ever constructed. The SIVB was specifically designed to provide the final thrust needed to send the Apollo 8 spacecraft into orbit around the Moon. The mission, launched on December 21, 1968, marked humanity's first journey to the lunar sphere and demonstrated the Saturn V's reliability in reaching Earth-Moon transfer orbits.

### Architecture
The SIVB featured a complex design with multiple components including the S-IVB engine, which was a modified version of the J-2 engine used in the second stage. It incorporated advanced fuel systems and guidance controls that allowed it to perform multiple burns during the mission. The stage was approximately 85 feet tall and 13 feet in diameter, with a dry mass of about 26,000 pounds. Its design included a service module that housed the spacecraft's propulsion and life support systems.

### Technical Specifications
The Apollo 8 SIVB utilized liquid hydrogen and liquid oxygen as propellants, providing approximately 200,000 pounds of thrust. It featured a single J-2 engine that could be throttled between 1,500 and 2,000 pounds of thrust. The stage was equipped with a guidance and control system that allowed for precise trajectory adjustments during the mission. Its COSPAR ID (1968-118B) and NSSDCA ID (1968-118B) are standard identifiers used by space agencies to catalog space missions.

### Related Projects
The SIVB was part of the broader Apollo program, which included the Saturn V launch vehicle and the Apollo spacecraft. It was the third stage of the Saturn V, which consisted of the S-IC first stage, S-II second stage, and S-IVB third stage. The SIVB's design was based on the earlier Saturn IB's third stage but was significantly upgraded for the Apollo missions. It was also related to the Apollo 11 mission, which used a similar SIVB to achieve the first lunar landing.

### Classification and Identity
The Apollo 8 SIVB is classified as a spacecraft according to the provided schema. It has multiple aliases including "Apollo 8 Saturn V third stage", "03627", and "Apollo8SIVB". These identifiers help distinguish it from other similar spacecraft and stages used in the Apollo program. The stage's designation as the third stage of the Saturn V booster clearly establishes its role within the launch vehicle system.

### Mission Operations
During the Apollo 8 mission, the SIVB performed three main burns. The first burn placed the spacecraft into Earth orbit, the second burn propelled it toward the Moon, and the third burn placed it into lunar orbit. The stage's service module provided additional propulsion and life support functions throughout the mission. After completing its mission, the SIVB was intentionally crashed into the lunar surface to create seismic data for scientific analysis.

### Legacy and Impact
The successful operation of the Apollo 8 SIVB demonstrated the Saturn V's capability to reach the Moon and return safely. This achievement was crucial for the subsequent Apollo missions that would land on the lunar surface. The SIVB's performance during the mission provided valuable data about lunar gravity and orbital mechanics, contributing to the understanding of space travel and lunar exploration. Its legacy is preserved as part of the Apollo program's historical record and as an example of 1960s aerospace engineering achievements.