# H-IIB

> Japanese expendable launch system used to launch H-II Transfer Vehicles

**Wikidata**: [Q60580](https://www.wikidata.org/wiki/Q60580)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/H-IIB)  
**Source**: https://4ort.xyz/entity/h-iib

## Summary
The H-IIB is a Japanese expendable launch system used to launch H-II Transfer Vehicles, part of the Japanese H-II rocket family.

## Key Facts
- The H-IIB is a Japanese expendable launch system used to launch H-II Transfer Vehicles.
- It belongs to the Japanese H-II rocket family.
- Manufactured by Mitsubishi Heavy Industries.
- Has a height of 56.6 meters and a diameter of 5.2 meters.
- Its main components include 4 SRB-A solid rocket boosters, 2 LE-7A liquid-fueled engines, and 1 LE-5B engine.
- The launch vehicle is classified as a rocket model.
- It originates from Japan.
- It has multiple aliases including H2B, H-2B, and H-IIB.

## FAQs
### Q: What is the H-IIB used for?
A: The H-IIB is a Japanese expendable launch system primarily used to launch H-II Transfer Vehicles.

### Q: What are the dimensions of the H-IIB?
A: The H-IIB has a height of 56.6 meters and a diameter of 5.2 meters.

### Q: Who manufactures the H-IIB?
A: Mitsubishi Heavy Industries manufactures the H-IIB.

## Why It Matters
The H-IIB played a crucial role in Japan's space program by enabling the launch of H-II Transfer Vehicles (HTVs) to the International Space Station. These cargo spacecraft delivered supplies and equipment to support scientific research and operations aboard the ISS. The H-IIB represented Japan's capability to develop and operate advanced launch systems, contributing to international space cooperation and advancing space technology. Its development and use demonstrated Japan's growing role in the global space industry and its commitment to space exploration.

## Notable For
- The H-IIB was specifically designed to launch H-II Transfer Vehicles, the Japanese automated cargo spacecraft.
- It features a configuration with 4 SRB-A solid rocket boosters, 2 LE-7A liquid-fueled engines, and 1 LE-5B engine.
- It was manufactured by Mitsubishi Heavy Industries.
- The launch vehicle has multiple designations and aliases including H2B, H-2B, and H-IIB.

## Body
### Technical Specifications
- **Height**: 56.6 meters (unit: metre)
- **Diameter**: 5.2 meters (unit: metre)
- **Country of origin**: Japan
- **Manufacturer**: Mitsubishi Heavy Industries
- **Classification**: rocket model

### Components
- 4 SRB-A solid rocket boosters
- 2 LE-7A liquid-fueled engines
- 1 LE-5B engine

### Operational Role
- Used to launch H-II Transfer Vehicles (HTVs) to the International Space Station
- Part of the Japanese H-II rocket family

### Relationship with H-II Transfer Vehicles
- The H-IIB was specifically developed to launch the H-II Transfer Vehicles, which are automated cargo spacecraft used for resupplying the International Space Station.

### Historical Context
- The H-IIB represents Japan's advancement in space launch technology and its contribution to international space cooperation through the International Space Station program.

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## References

1. Freebase Data Dumps. 2013