# OKEANOS

> proposed mission concept to Jupiter's Trojan asteroids using a hybrid solar sail & a solar powered ion engine propulsion

**Wikidata**: [Q20982976](https://www.wikidata.org/wiki/Q20982976)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/OKEANOS)  
**Source**: https://4ort.xyz/entity/okeanos

## Summary
OKEANOS is a proposed mission concept to explore Jupiter's Trojan asteroids using a hybrid propulsion system combining a solar sail and a solar-powered ion engine. Developed collaboratively by the Institute of Space and Astronautical Science (Japan) and the German Aerospace Center, it aims to study these primitive celestial bodies that share Jupiter's orbit.

## Key Facts
- **Mission Type**: Proposed space probe designed for exploration beyond Earth orbit
- **Primary Target**: Jupiter's Trojan asteroids, primitive bodies sharing Jupiter's orbit
- **Propulsion System**: Hybrid design using both a solar sail and a solar-powered ion engine
- **Mass Specifications**:
  - Takeoff mass: 1,400 kg
  - Landing mass: 100 kg
- **Payload Mass**:
  - Spacecraft: 30 kg
  - Lander: 20 kg
- **Data Transfer Speed**: 16 kilobits per second
- **Operators**: Japan Aerospace Exploration Agency (JAXA)
- **Manufacturers**: Institute of Space and Astronautical Science (Japan) and German Aerospace Center
- **Country of Origin**: Japan
- **Aliases**: Oversize Kite-craft for Exploration and Astronautics in the Outer Solar System (OKEANOS), Jupiter Trojan Asteroid Explorer

## FAQs
### Q: What is the purpose of the OKEANOS mission?
A: OKEANOS aims to study Jupiter's Trojan asteroids, primitive celestial bodies that share Jupiter's orbit, using a hybrid solar sail and ion propulsion system.

### Q: Who is behind the OKEANOS mission?
A: The mission is a collaborative effort between the Institute of Space and Astronautical Science (Japan) and the German Aerospace Center, with operational oversight by the Japan Aerospace Exploration Agency.

### Q: What makes OKEANOS unique in space exploration?
A: OKEANOS is notable for its hybrid propulsion system, combining a solar sail with an ion engine, which could enable efficient long-duration missions to distant asteroids.

### Q: How much data can OKEANOS transmit?
A: The mission is designed to transmit data at a rate of 16 kilobits per second.

### Q: What is the expected mass of the OKEANOS spacecraft?
A: The spacecraft has a takeoff mass of 1,400 kg and a landing mass of 100 kg, with a payload mass of 30 kg for the spacecraft and 20 kg for the lander.

## Why It Matters
OKEANOS represents a significant advancement in asteroid exploration by leveraging hybrid propulsion technology. Jupiter's Trojan asteroids are of particular scientific interest because they are remnants from the early solar system, offering insights into planetary formation. The mission's hybrid propulsion system—combining a solar sail for high-speed travel and an ion engine for precise maneuvering—could revolutionize deep-space exploration. By studying these asteroids, OKEANOS could provide critical data on the composition and dynamics of primitive solar system bodies, enhancing our understanding of planetary evolution. The collaboration between Japanese and German institutions underscores international cooperation in space exploration, pushing the boundaries of what is possible with current and emerging technologies.

## Notable For
- **Hybrid Propulsion**: First proposed mission to use both solar sails and ion propulsion for deep-space exploration
- **Asteroid Targeting**: Focus on Jupiter's Trojan asteroids, which are scientifically valuable but difficult to reach
- **International Collaboration**: Joint development by Japan's Institute of Space and Astronautical Science and Germany's Aerospace Center
- **Data Efficiency**: Designed to transmit data at 16 kilobits per second, optimized for long-distance communication
- **Mass Specifications**: Unique mass distribution (1,400 kg at takeoff, 100 kg at landing) tailored for asteroid exploration

## Body
### Mission Overview
OKEANOS is a proposed mission concept to explore Jupiter's Trojan asteroids, a group of primitive celestial bodies that share Jupiter's orbit. The mission leverages a hybrid propulsion system, combining a solar sail for high-speed travel and a solar-powered ion engine for precise maneuvering. This approach aims to maximize efficiency and extend mission capabilities in deep space.

### Propulsion System
The OKEANOS spacecraft employs a hybrid propulsion system:
- **Solar Sail**: Provides continuous acceleration using solar radiation pressure, enabling high-speed travel.
- **Ion Engine**: Offers precise thrust for orbital adjustments and landing maneuvers.

### Mass and Payload
- **Takeoff Mass**: 1,400 kg, including fuel and structural components.
- **Landing Mass**: 100 kg, after fuel depletion and payload separation.
- **Payload Mass**:
  - Spacecraft: 30 kg for scientific instruments and systems.
  - Lander: 20 kg for surface exploration.

### Data Transmission
The mission is designed to transmit data at a rate of 16 kilobits per second, sufficient for scientific observations and mission control communication.

### Collaboration and Operation
- **Developers**: Institute of Space and Astronautical Science (Japan) and German Aerospace Center.
- **Operator**: Japan Aerospace Exploration Agency (JAXA).
- **Country of Origin**: Japan.

### Scientific Significance
Jupiter's Trojan asteroids are of particular interest because they are remnants from the early solar system, offering insights into planetary formation and evolution. OKEANOS aims to study their composition, dynamics, and potential resources, contributing to our understanding of the solar system's history.

### Technological Innovation
OKEANOS represents a technological breakthrough by integrating solar sail and ion propulsion, demonstrating the feasibility of hybrid systems for long-duration space missions. The mission's success could pave the way for future deep-space exploration using advanced propulsion technologies.

## References

1. [SCIENCE AND EXPLORATION IN THE SOLAR POWER SAIL OKEANOS MISSION TO A JUPITER TROJAN ASTEROID](https://www.hou.usra.edu/meetings/lpsc2018/pdf/1406.pdf)
2. [CIENCE AND EXPLORATION IN THE SOLAR POWER SAIL OKEANOS MISSION TO A JUPITER TROJAN ASTEROID](https://www.hou.usra.edu/meetings/lpsc2018/pdf/1406.pdf)