# Space One KAIROS

> Japanese private small-lift orbital rocket

**Wikidata**: [Q124727307](https://www.wikidata.org/wiki/Q124727307)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Space_One_KAIROS)  
**Source**: https://4ort.xyz/entity/space-one-kairos

## Summary
Space One KAIROS is a Japanese private small-lift orbital rocket designed and operated by Space One. It is a four-stage, solid‑propellant launch vehicle that entered service on 2024-03-13 and is intended to carry payloads into outer space from Spaceport Kii.

## Key Facts
- Space One KAIROS is a Japanese private small-lift orbital rocket (instance_of: rocket model; subclass_of: launch vehicle, solid-propellant rocket, four-stage-to-orbit).
- Operator: Space One.
- Manufacturer: Space One and IHI Aerospace.
- Service entry date: 2024-03-13.
- Launch weight (mass): 23 tonnes (criterion: launch weight).
- Height: 18 metres.
- Diameter: 1.35 metres.
- Start/launch point: Spaceport Kii.
- Country of origin: Japan.
- Aliases: KAIROS; Kii-based Advanced & Instant Rocket System; スペースワン・カイロス; name in kana: カイロスロケット.
- Related entity: TUGKE-1, a Japanese satellite lost in a launch failure.

## FAQs
### Q: What is Space One KAIROS?
A: Space One KAIROS is a Japanese private small-lift orbital rocket — a four-stage, solid-propellant launch vehicle built and operated by Space One with participation from IHI Aerospace.

### Q: When did KAIROS enter service?
A: KAIROS entered service on 2024-03-13.

### Q: Who manufactures and operates KAIROS?
A: The vehicle is manufactured by Space One in partnership with IHI Aerospace and operated by Space One.

### Q: Where does KAIROS launch from?
A: The designated start point (launch site) for KAIROS is Spaceport Kii.

## Why It Matters
Space One KAIROS is significant as a privately developed Japanese small-lift orbital launch vehicle that expands national launch capabilities. As a four-stage, solid-propellant rocket with a launch weight of 23 tonnes, an overall height of 18 metres, and a 1.35‑metre diameter, KAIROS represents a concrete engineering approach to achieving orbital access within the small-lift class. Its entry into service on 2024-03-13 marks a formal operational milestone for Space One and for private-sector rocket development in Japan. Manufactured by Space One with involvement from IHI Aerospace and operated from Spaceport Kii, KAIROS is positioned within the launch-vehicle category used to carry payloads into outer space. The vehicle’s documented aliases and multilingual recognition (including titles in Japanese and multiple Wikipedia language entries) indicate its identification within international reference sources. Additionally, KAIROS is connected in available records to at least one related mission element (TUGKE-1), reflecting its role in contemporary Japanese launch activities.

## Notable For
- Being a Japanese private-sector small-lift orbital rocket that entered service on 2024-03-13.
- Four-stage-to-orbit architecture using solid propellant.
- Compact launch mass and dimensions: 23 tonnes launch weight, 18 m height, 1.35 m diameter.
- Developed and manufactured by Space One with IHI Aerospace and operated from Spaceport Kii.
- Known under multiple aliases, including Kii-based Advanced & Instant Rocket System and Japanese name カイロスロケット.

## Body

### Overview
- Name: Space One KAIROS (also KAIROS; Kii-based Advanced & Instant Rocket System; スペースワン・カイロス).
- Instance_of: rocket model; subclass_of: launch vehicle, solid-propellant rocket, four-stage-to-orbit.
- Country of origin: Japan.
- Operator: Space One.
- Manufacturer: Space One, IHI Aerospace.

### Timeline
- Service entry: 2024-03-13.

### Physical specifications
- Launch weight (mass): 23 tonnes (criterion used: launch weight).
- Height: 18 metres.
- Diameter: 1.35 metres.

### Propulsion and architecture
- Propellant type: solid propellant (classified as a solid‑propellant rocket).
- Staging: four-stage-to-orbit design.

### Operations and launch site
- Start point / launch site: Spaceport Kii.
- Role: Launch vehicle — rocket used to carry payload into outer space.

### Identification and references
- Name in kana: カイロスロケット.
- Wikipedia title: Space One KAIROS; available in multiple languages (de, en, fa, fr, ja, ru, zh).
- Sitelink count (reference metric): 8.

### Related entities
- Related: TUGKE-1 — described as a Japanese satellite lost in a launch failure (linked in available source material).

## References

1. [Source](https://www.nikkei.com/article/DGXZQOUC06C1P0W4A300C2000000/)
2. [Source](https://www.space-one.co.jp/vehicle/index_e.html)