# H-II

> Japanese family of rockets

**Wikidata**: [Q548376](https://www.wikidata.org/wiki/Q548376)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/H-II)  
**Source**: https://4ort.xyz/entity/h-ii

## Summary
The H-II is a Japanese family of rockets, manufactured by Mitsubishi Heavy Industries. It is classified as an expendable launch vehicle and a medium-lift launch vehicle, designed to carry moderate payloads into low-Earth orbit. This family includes variants such as the H-IIA and H-IIB.

## Key Facts
*   The H-II is a Japanese family of rockets.
*   It is manufactured by Mitsubishi Heavy Industries.
*   The H-II is classified as an expendable launch vehicle, meaning it is expended after use.
*   It is also a medium-lift launch vehicle, capable of lifting moderate payloads to low-Earth orbit.
*   The H-II family includes the H-IIA and H-IIB launch vehicles.
*   It is a liquid-propellant rocket and utilizes a two-stage-to-orbit design.
*   The country of origin for the H-II rocket family is Japan.
*   Payloads launched using H-II rockets include the Myojo evaluation spacecraft, Himawari 5 meteorological satellite, and Space Flyer Unit research satellite.

## FAQs
### Q: What is the H-II?
A: The H-II is a Japanese family of rockets, manufactured by Mitsubishi Heavy Industries. It is an expendable medium-lift launch vehicle designed for space launches.

### Q: Who manufactures the H-II rocket family?
A: The H-II rocket family is manufactured by Mitsubishi Heavy Industries. This company is also referenced as the manufacturer in academic sources.

### Q: What are some variants of the H-II rocket family?
A: The H-II rocket family includes the H-IIA and H-IIB launch vehicles. The H-IIA is described as a Japanese expendable medium-lift launch vehicle, and the H-IIB is a Japanese expendable launch system used to launch H-II Transfer Vehicles.

### Q: What type of launch vehicle is the H-II?
A: The H-II is classified as an expendable launch vehicle and a medium-lift launch vehicle. It is also a liquid-propellant rocket and employs a two-stage-to-orbit design.

### Q: What country is the H-II rocket family from?
A: The H-II rocket family originates from Japan. This is indicated as its country of origin in structured properties.

## Why It Matters
The H-II rocket family is significant as a cornerstone of Japan's independent space capabilities. As a Japanese-developed and manufactured expendable medium-lift launch vehicle, it provides the nation with crucial access to space for various scientific, meteorological, and communication purposes. Its ability to launch moderate payloads to low-Earth orbit has enabled the deployment of important Japanese spacecraft, such as the Himawari 5 meteorological satellite, the Space Flyer Unit research satellite, and the ADEOS I Earth observation satellite. The development and operation of the H-II and its variants, the H-IIA and H-IIB, demonstrate Japan's advanced technological prowess in aerospace engineering. By providing a reliable means of launching satellites, the H-II family supports Japan's contributions to global scientific research, environmental monitoring, and communication infrastructure, thereby enhancing its role in the international space community. Its existence ensures that Japan can pursue its space objectives without sole reliance on other nations' launch services.

## Notable For
*   Being a family of rockets developed and manufactured in Japan.
*   Its classification as an expendable launch vehicle, meaning it is used once and not recovered.
*   Its capability as a medium-lift launch vehicle, designed to carry moderate payloads into low-Earth orbit.
*   Including the H-IIA and H-IIB as its primary variants, which have served different launch needs.
*   Launching a diverse range of Japanese satellites, including meteorological, research, and Earth observation spacecraft.

## Body

### Overview
The H-II is a family of rockets originating from Japan. It is also known by its aliases H-2 and H2. The H-II rocket family is manufactured by Mitsubishi Heavy Industries.

### Classification and Type
The H-II is categorized as a rocket family. It is an instance of an expendable launch vehicle, which means it is designed to be used once and then discarded. It is also classified as a medium-lift launch vehicle, indicating its capacity to carry moderate payloads into low-Earth orbit. Further, the H-II is a subclass of liquid-propellant rockets and utilizes a two-stage-to-orbit design.

### Components and Variants
The H-II rocket family includes the following specific launch vehicles:
*   **H-IIA**: Described as a Japanese expendable medium-lift launch vehicle.
*   **H-IIB**: A Japanese expendable launch system primarily used to launch H-II Transfer Vehicles.

### Related Missions and Payloads
The H-II rocket family has been associated with the launch of various spacecraft and missions:
*   **Myojo**: A Japanese spacecraft used to evaluate the performance of the H-II rocket.
*   **Himawari 5**: A Japanese meteorological satellite launched in 1995.
*   **Space Flyer Unit**: A Japanese research satellite.
*   **Kiku-7 Chaser**: A Japanese rendezvous demonstration satellite.
*   **OREX**: A Japanese re-entry demonstrator prototype.
*   **Kiku-6**: A Japanese technology demonstration satellite.
*   **Kiku-7 Target**: A Japanese rendezvous demonstration satellite.
*   **COMETS**: A Japanese communications demonstration satellite.
*   **MTSat-1**: A Japanese geostationary navigation satellite, which was lost in a launch failure.
*   **ADEOS I**: A former Earth observation satellite.
*   **JAS-2**: A Japanese amateur radio satellite.
*   **Tropical Rainfall Measuring Mission**: A joint space mission between NASA and JAXA.

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