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# Xihe-class Interplanetary Exploration Mothership (Xihe)
Xihe (Chinese: 羲和) is the first generation of interplanetary exploration motherships, designed for crewed missions to planets and large moons within the Solar System. Intended to operate as a mobile base of operations, Xihe provides life support, long-duration habitation, scientific laboratories, power generation, and towing capability for planetary surface vehicles. The design emphasizes sustained crew survivability and mission flexibility through modular habitat segments, closed-loop life support with an integrated greenhouse, and a high delta-v propulsion system based on a mass-driver architecture powered by a large fusion Arc-reactor.
## Lead
The Xihe-class motherships were conceived for sustained, crewed exploration of Mars, Venus, and the moons of the outer planets. Each vessel integrates modular habitat sections arranged along a central spine, a rotating artificial-gravity habitat, redundant power systems, and a mass driver main propulsion system. Xihe is capable of carrying a 300-ton payload (including surface exploration vehicles and supplies) and has a stated delta-v capacity of 1700 km/s in that configuration. Crew support facilities are sized for a nominal complement of 15 for missions up to several years in duration, with short-term capacity for up to 30 personnel.
## Design and layout
The Xihe-class follows an elongated, multi-segmented cylindrical "spine" arrangement. Major modules are stacked along the central axis to concentrate structural loads during thrust and towing operations while keeping the overall cross-sectional area small to reduce collision risk with micrometeoroids.
### Front docking hub
The forward section houses a reinforced front docking hub with five docking ports intended for shuttles, landers, and towable surface vehicles. The primary forward docking port is a 2.5 m diameter port that is structurally reinforced for towing under thrust. Four additional telescopic side ports (two 1.875 m and two 1.25 m) are provided for boarding and cargo transfer while the ship is stationary.
### Command center
Directly aft of the forward hub is the command center. This 5-meter-diameter module accommodates navigation, communications, mission control, and core avionics. It contains two airlocks for EVA (crew and cargo) and is equipped with advanced sensors and redundant computing systems for trajectory, attitude, and systems management.
### Artificial gravity habitat module
The primary habitation for long-duration missions is a rotating ring habitat with a 25-meter diameter that spins at approximately 4 revolutions per minute to generate roughly 0.41 g of artificial gravity via centrifugal force. The ring contains crew sleeping quarters, dining and recreational spaces, and laboratory facilities oriented to support both nominal habitation and mission science tasks.
### Stationary habitat module
A non-rotating habitat module immediately aft of the rotating ring provides medical facilities, additional laboratories, storage, and mission-support spaces. With a 5-meter diameter, it is sized to help sustain up to 15 crew members comfortably over prolonged missions.
### Center docking hub and extension modules
A secondary, center-mounted docking hub follows the habitats. It includes four side-mounted telescopic 1.875 m ports (two directly on the hub and two on extension modules). Each extension module terminates in a 2.5 m observation cupola on its upper face and a communications dish on the lower face. All center-hub docking ports are reinforced for towing under acceleration and are typically used to interface with planetary surface vehicles such as the [Echo Shuttle](/home/Space_Shuttles/Echo_Shuttle) and the [Amalthea MPV](/home/Vehicles/Amalthea). Echo Shuttles are prioritized for atmospheric landings while Amalthea-class vehicles are used primarily for landings on airless bodies.
### Greenhouse module
A 5-meter-diameter automated greenhouse module supports hydroponic cultivation and contributes to closed-loop life support by recycling carbon dioxide into oxygen and producing fresh foodstuffs. The hydroponic systems include LED lighting, climate control, and automated nutrient delivery. The greenhouse is sized to support the dietary needs of up to 15 crew members for approximately five years given the onboard fertilizer supplies; water and air reclaim systems are effectively indefinite, but nutrient (fertilizer) reserves limit continuous autonomous operations without resupply or in-situ resource production.
### Main storage and secondary storage
Following the greenhouse is a main storage module (5 m diameter) providing accessible cargo stowage for mission equipment and emergency reserves. The design allows for up to 10.5 months of extra supplies for the full crew complement to permit direct aborts to Earth or rendezvous with the nearest support station in contingency scenarios. A secondary storage module located near the truss stores EVA gear, spare parts, and maintenance supplies.
### Truss structure and small Arc-reactor
A truss framework separates the habitation and storage modules from the propulsion module. This truss supports radiators, external systems and provides standoff distance to protect the crew from reactor and engine radiation during operation. Two additional docking ports (top and bottom of the truss) support towing operations. Mounted on the lower truss is a small Arc-reactor that provides emergency electrical power sufficient for life support and attitude control in the event of a main reactor failure.
### Propulsion module
The aft-most section contains the propulsion module with the main mass driver engines, fuel tanks (reaction mass), the primary cold-fusion Arc-reactor rated to produce up to 8 terawatts (TW), radiators, attitude-control thrusters, and communication arrays. The mass driver system expels reaction mass at high exhaust velocities to produce thrust and offers two operating modes:
- Standard Mode: 2400 kN thrust at an effective specific impulse (Isp) of ~500,000 s for high-efficiency transfers.
- High-Thrust Mode: up to 3800 kN thrust at an Isp of ~250,000 s for accelerated maneuvers at the expense of fuel economy.
The engines are smoothly throttleable in both modes to allow precise delta-v budgeting and maneuvering. The propulsion module stores roughly 196.3 tonnes of reaction mass, supporting a stated delta-v capability of 1700 km/s with a 300-ton payload.
## Systems and subsystems
- Power: Primary power is provided by a large Arc-reactor (cold-fusion) with an 8 TW output; the small Arc-reactor on the truss is a secondary/backup unit for essential loads.
- Life support: Closed-loop air, water, and waste recycling systems with hydroponics-assisted oxygen regeneration and food production.
- Radiation shielding: Enhanced shielding around habitat volumes, with the truss providing separation from the main reactor and engine radiation sources.
- Docking and EVA: Multiple docking ports with telescopic mechanisms and two airlocks in the command center.
## Construction and assembly
Initial Xihe-class vessels were assembled in low Earth orbit (LEO) using repeated launches of the [Vulture Shuttle](/home/Space_Shuttles/Vulture_Shuttle) to deliver discrete modules and components. Assembly procedures included deploying a center docking hub early in the build sequence, then progressively attaching habitats, storage, truss, and propulsion modules. Larger modules such as the artificial gravity habitat required delivery by heavier-lift launch vehicles.
Later production shifted to [Star Port Station](/home/Stations/Star_Port_Station), an orbital shipyard in LEO that streamlines assembly and outfitting. Components for later motherships are delivered by larger cargo craft such as [Qingtian](/home/Cargo_Ships/Qingtian), reducing the number of shuttle-class launches required for assembly.
## Operational history
The first batch of three Xihe motherships was constructed between 2050 and 2055. [XH-01 — Xihe](/home/Exploration_Motherships/Xihe/XH-01) completed in early 2052 and entered service on crewed missions to Mars and the Jovian system. During XH-01 construction, engineering improvements were identified that informed later designs and led to the development of the [Stellaria-class motherships](/home/Exploration_Motherships/Stellaria/ST-01), which adopt a newer [Lightspeed Engine](/home/Engines/Lightspeed_Engine).
Two of the early Xihe hulls were redesigned during construction to integrate the Lightspeed Engine and other enhancements; these vessels were redesignated as [Stellaria-class](/home/Exploration_Motherships/Stellaria/ST-01) ([ST-01 — Stellaria](/home/Exploration_Motherships/Stellaria/ST-01) and [ST-02 — Kristen](/home/Exploration_Motherships/Stellaria/ST-02)) and entered service supporting [Mars One](/home/Bases/Mars_One) and [Europa Research Outpost](/home/Bases/Europa_Research_Outpost) projects. Subsequent Xihe-class vessels (for example, [XH-02 — Taibai](/home/Exploration_Motherships/Xihe/XH-02)) incorporated incremental upgrades such as improved radiation shielding and augmented life support.
As missions progressed, Xihe-class ships were used extensively for crew rotation, logistics, and transport of large surface exploration vehicles and construction materials for off-world bases.
## Missions and mission profiles
Typical Xihe mission packages combine scientific research, surface exploration, base construction support, and technology demonstration. Two common transfer profiles are described:
- Standard profile: departure burns under ~200 km/s, yielding one-way Earth–Mars transit times commonly between 20 and 140 days depending on planetary alignment and mission constraints.
- Fast-travel profile: higher-energy burns (up to ~250 km/s per major burn) that reduce travel time; under optimal alignment, Earth–Mars transit can be reduced to as little as 8 days, with significantly increased propellant consumption.
Mission planners commonly target a practical one-way transit of roughly 30 days for Mars missions and about 70 days for missions to Jupiter's moons while using delta-v budgets that balance time and fuel consumption.
## Specifications
### Performance
- Propulsion: Endurance Mass Driver Propulsion System
- Main engine thrust: 2400 kN (Standard Mode), 3800 kN (High-Thrust Mode)
- Specific impulse (Isp): ~500,000 s (Standard Mode), ~250,000 s (High-Thrust Mode)
- Delta-v: ~1700 km/s (with 300-ton payload)
### Mass and dimensions
- Fuel / reaction mass: ~196.3 t
- Wet mass (without payload): ~365.3 t
- Overall length: ~83.4 m
- Habitation ring diameter: 25 m
### Payload and towing
- Maximum payload: 300 t (including planetary surface exploration vehicles and supplies)
- Towing capacity: up to 200 t at the reinforced front port; 100 t per side docking port
### Crew and endurance
- Crew (nominal): 15 (sustainable for up to ~5 years with greenhouse support)
- Short-term capacity: up to 30 crew
- Life support consumables (without greenhouse): ~315 days for 15 crew
## Fleet
| Name | Serial number | Status | Notes |
|-----------|---------------|------------------|-------|
| Xihe | [XH-01](/home/Exploration_Motherships/Xihe/XH-01) | Active | First of its class; early missions included Mars and Jovian moon exploration. |
| Stellaria | [ST-01](/home/Exploration_Motherships/Stellaria/ST-01) | Active | Transitional design to Stellaria class; equipped with the Lightspeed Engine. |
| Kristen | [ST-02](/home/Exploration_Motherships/Stellaria/ST-02) | Active | Transitional design to Stellaria class; equipped with the Lightspeed Engine. |
| Taibai | [XH-02](/home/Exploration_Motherships/Xihe/XH-02) | Active | Second of its class; supported Mars One base expansion. |
| Changxi | [XH-03](/home/Exploration_Motherships/Xihe/XH-03) | Testing in LEO | Third of its class; intended to support Europa Research Outpost rotation and Venus exploration. |
| Unnamed | [XH-04](/home/Exploration_Motherships/Xihe/XH-04) | Under construction | Fourth of its class; expected completion in mid 2061. |
## Naming and variant notes
Several Xihe-series hulls were reconfigured during production to incorporate newer propulsion options. Notably, two hulls were redesignated as early [Stellaria](/home/Exploration_Motherships/Stellaria/ST-01) variants ([ST-01 — Stellaria](/home/Exploration_Motherships/Stellaria/ST-01) and [ST-02 — Kristen](/home/Exploration_Motherships/Stellaria/ST-02)) after installation of the [Lightspeed Engine](/home/Engines/Lightspeed_Engine); these transitional vessels bridge the Xihe and Stellaria classes in capability and role.
## Gallery (image placeholders)
![Xihe profile diagram](./images/Xihe_profile.png)
Image description: A three-quarter profile diagram of the Xihe-class mothership showing the elongated multi-segmented spine, forward docking hub with telescopic side ports, command center, rotating habitat ring (25 m diameter), stationary habitat, greenhouse and storage modules, truss structure, and the rear propulsion module with mass driver engines and radiators. The diagram is annotated to indicate module diameters, docking-port sizes (2.5 m front port; 1.875 m and 1.25 m side ports), and approximate module lengths. Scale bars and a legend for major subsystems are included.
![Xihe habitat ring interior view](./images/Xihe_habitat_interior.png)
Image description: Interior rendering of the rotating habitat ring showing living quarters, communal dining, laboratory racks, and exercise equipment arranged radially. The image includes callouts describing the artificial gravity level (~0.41 g), rotation rate (~4 rpm), and typical hab-space allocations per crewmember. A small greenhouse access corridor connecting to the stationary module is visible.
![Xihe propulsion module schematic](./images/Xihe_propulsion_schematic.png)
Image description: Cutaway schematic of the propulsion module and primary Arc-reactor with labeled components: fusion Arc-reactor (8 TW nominal), main mass driver throats, reaction mass tanks (total ~196.3 t), large radiators, and attitude control thrusters. The schematic contrasts Standard Mode (high Isp, moderate thrust) and High-Thrust Mode (reduced Isp, higher thrust) performance envelopes.
Notes for image use: The images above are placeholders. When adding actual images to the repository, store them in `data/vehicle_descriptions/en/images/` (or a shared images folder) and ensure the filenames match the references used above. Each image should be accompanied by descriptive alt text and the caption/description block shown here.
## See also
- [Stellaria-class mothership](/home/Exploration_Motherships/Stellaria/ST-01)
- [Echo Shuttle](/home/Space_Shuttles/Echo_Shuttle)
- [Amalthea MPV](/home/Vehicles/Amalthea)
- [Lightspeed Engine](/home/Engines/Lightspeed_Engine)
- [Mars One](/home/Bases/Mars_One)
- [Europa Research Outpost](/home/Bases/Europa_Research_Outpost)
## References
This article is based on the provided Xihe raw specification document supplied by the project. Specific numeric values (engine thrust, Isp, delta-v, masses, module diameters, rotation rate, etc.) are taken from that source and are reported without independent verification.
---
(Article prepared in English and saved to `data/vehicle_descriptions/en/Xihe.md` as a Wikipedia-style entry. Images are referenced as placeholders; please add actual image files in the recommended images directory if available.)
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# Xihe Interplanetary Exploration Mothership
## Overview
Xihe Interplanetary Exploration Mothership is the first generation of interplanetary ships. It is designed for crewed exploration to other planets, such as Mars, Venus, or celestial bodies like the moons of Jupiter and Saturn. The mothership serves as a mobile base of operations, providing life support, navigation, and scientific research capabilities for extended missions in deep space.
Xihe is named after the Chinese Solar Deity, symbolizing its role in exploring the solar system. The ship is equipped with advanced propulsion systems, radiation shielding, and modular habitats to ensure the safety and comfort of its crew during long-duration missions.
## Key Features:
1. **Propulsion System**: Xihe utilizes a mass driver propulsion system, allowing for efficient travel over vast distances in space. The main engines are powered by a large fusion reactor to expel mass at high velocities. It has a delta-v capacity of 1700 km/s when carrying a 300-ton payload (including 100 tons for planetary surface exploration vehicles and supplies).
2. **Life Support**: The mothership is equipped with closed-loop life support systems that recycle air, water, and waste, ensuring sustainability for missions lasting several years. The on-board greenhouse can support a crew of up to 15 members.
3. **Artificial Gravity**: To mitigate the effects of long-term weightlessness, Xihe features a rotating habitat module that generates artificial gravity through centrifugal force. This helps maintain crew health and well-being during extended missions. The habitat module is able to produce up to 0.41 g of artificial gravity.
4. **Towing Capability**: Xihe is designed to tow smaller spacecraft, such as landers and shuttles. It has multiple docking ports and a robust structural framework to accommodate the stresses of towing during interplanetary travel.
5. **Scientific Research**: The mothership is equipped with state-of-the-art laboratories and observation decks, allowing for in-depth scientific research and data collection during missions. It also has facilities for remote operation of planetary exploration vehicles.
## Design:
The overall shape of Xihe is an elongated, multi-segmented cylinder or spine, with major modules stacked together along a central axis. This allows for better structural integrity during main engine thrust and towing operations, while minimizing the ship's cross-sectional area to reduce collision risks with micrometeoroids and space debris.
### Front docking hub
At the front of the ship is a large docking hub with five docking ports for smaller spacecraft. The front docking port is structurally reinforced to handle the stresses of towing operations, while four telescopic side ports are only used when the ship is stationary. The front docking port is a 2.5 m port, and the side ports are two 1.875 m ports and two 1.25 m ports.
### Command Center
Directly behind the front docking hub is the command center, which houses the ship's navigation, communication, and control systems. The command center is equipped with advanced sensors and computer systems to ensure safe and efficient operation during interplanetary travel. The command center is also equipped with two airlocks for crew and cargo EVA operations. With a diameter of 5 meters, the command center is spacious enough to accommodate the ship's crew and essential systems.
### Artificial Gravity Habitat Module
Located behind the command center is the artificial gravity habitat module. This module is a large rotating ring structure that generates artificial gravity through centrifugal force. The habitat module is designed to provide a comfortable living and working environment for the crew, with sleeping quarters, recreational areas, dining facilities, and science labs. The habitat module has a diameter of 25 meters and rotates at a speed of 4 revolutions per minute to generate 0.41 g of artificial gravity.
### Stationary Habitat Module
Following the artificial gravity habitat module is the stationary habitat module. This module is non-rotating and provides additional living space for the crew. It includes medical facilities, storage areas, and additional laboratories for scientific research. The stationary habitat module has a diameter of 5 meters and is designed to accommodate up to 15 crew members comfortably.
### Center Docking Hub
After the habitat modules is the center docking hub, which features four additional side-mounted docking ports.
Two 1.875 m telescopic docking ports are directly mounted on the side of the hub, while another two 1.875 m telescopic docking ports are mounted on the side of extension modules. At the top of each extension module is a 2.5 m cupola module for observation and external monitoring, and the bottom of each extension module houses a communications dish for long-range communication with Earth and other spacecraft.
All four docking ports are structurally reinforced to handle towing operations when the ship is under acceleration.
Typically, these docking ports are used to dock with exploration vehicles with VTOL and side towing capabilities, like Echo Shuttles or Amalthea MPVs. These vehicles can be used to ferry crew and cargo between the mothership and planetary surfaces. Echo Shuttles are preferred for atmospheric landings, while Amalthea MPVs are used for airless body landings, though both vehicles are capable of landing on any type of celestial body.
### Greenhouse Module
Next in line is the greenhouse module, which is essential for long-duration missions. The greenhouse module is designed to grow food and recycle air and water for the crew. It features hydroponic systems, LED grow lights, and climate control to ensure optimal growing conditions for a variety of crops. The greenhouse module has a diameter of 5 meters and is capable of supporting the dietary needs of up to 15 crew members for 5 years. Greenhouse operations are fully automated, requiring minimal crew intervention, allowing the crew to focus on other mission tasks.
The greenhouse produces fresh fruits and vegetables, supplementing the crew's diet and improving their overall health and well-being during extended missions. The greenhouse module also plays a crucial role in maintaining the ship's life support systems by recycling carbon dioxide into oxygen through photosynthesis.
The 5-year limit is largely due to fertilizer quantity, as the hydroponic systems require a steady supply of nutrients to sustain plant growth. While water and air can be recycled indefinitely, the finite amount of fertilizer onboard limits the duration of effective greenhouse operations. Resupply missions or the ability to produce fertilizer in-situ would be necessary to extend the operational lifespan of the greenhouse module beyond 5 years.
### Main Storage Module
Behind the greenhouse module is the main storage module. This module is used to store supplies, equipment, and scientific instruments needed for the mission. It is designed to be easily accessible from both the habitat modules and the command center. The main storage module has a diameter of 5 meters and provides ample space for all necessary cargo. Since the life support systems are designed to be closed-loop, there isn't a need for large amounts of consumables storage in normal circumstances. But to prepare for emergencies, the storage module is designed to hold up to 10.5 months' worth of extra supplies for the entire crew, allowing a direct abort to Earth or the nearest space station if needed.
### Truss Structure
Following the main storage module is the truss structure, which provides structural support for the ship's propulsion system and other external components. The truss structure is designed to withstand the stresses of interplanetary travel and towing operations. There are also two docking ports at the top and bottom of the truss structure for additional docking options, both supporting towing operations. The truss structure is vital for keeping the crew away from the radiation emitted by the main engines during operation.
An additional small Arc-reactor as well as a secondary storage module are located at the bottom of the truss structure. The small Arc-reactor provides power to the ship in the event of a main reactor failure. It is nowhere near as powerful as the main reactor, but it is sufficient to power essential systems and maintain life support for the crew. The secondary storage module is used to store EVA equipment, spare parts, and other essential supplies needed for maintenance and repairs during the mission.
### Propulsion Module
At the rear of the ship is the propulsion module, which houses the main engines, fuel storage tanks, fusion reactor, additional comms, radiators, attitude control thrusters, and other essential systems needed for interplanetary travel. The propulsion module is designed to provide the necessary thrust and maneuverability for the mothership during its missions.
The main engine is a mass driver propulsion system, which expels reaction mass at high velocities to generate thrust. The fusion reactor provides the necessary power to operate the engines and other systems on the ship. The engine is capable of operating in two different modes: Standard Mode and High-Thrust Mode. In Standard Mode, the engine can produce 2400 kN of thrust at an Isp of 500,000 s, allowing for efficient travel over long distances. In High-Thrust Mode, the engine can provide a higher thrust output at the cost of reduced specific impulse, allowing for quicker maneuvers and acceleration when needed. In High-Thrust Mode, the engine can produce up to 3800 kN of thrust at an Isp of 250,000 s. Due to the nature of mass driver propulsion, the engine can be throttled smoothly in both modes, allowing for precise control over thrust and fuel consumption.
The main engine requires a significant amount of power to operate, which is provided by the fusion reactor. The main reactor is a large cold-fusion Arc-reactor capable of producing up to 8 TW of power, most of which is used to power the engines and other critical systems. In the event of a main reactor failure, the small Arc-reactor located at the bottom of the truss structure can provide backup power to essential systems. It is too weak to power the main engines, but it can power the ship's attitude control thrusters and life support systems, allowing the crew to maintain control of the ship and ensure their safety until repairs can be made or rescue arrives.
A total of nearly 200 tons of reaction mass is stored in the propulsion module, allowing for a total delta-v of 1700 km/s when carrying a 300-ton payload.
The propulsion module also includes large radiators to dissipate heat generated by the reactor and engines, ensuring the ship remains within safe operating temperatures.
## Construction
Xihe was originally constructed in LEO via multiple launches of Vulture Shuttles to deliver components and modules.
The first Vulture Shuttle would deploy the Center Docking Hub from its payload bay and dock with it as an operational base. Several other Vulture Shuttles would then deliver additional modules and supplies as needed. The Artificial Gravity Habitat Module was delivered by another super heavy launch vehicle, as even in stored configuration it is too large for the Vulture Shuttle. Once the mothership was fully assembled, it would perform a series of test maneuvers in LEO before embarking on its maiden interplanetary mission. The first batch of Xihe motherships were constructed in this manner, demonstrating the feasibility of interplanetary exploration mothership assembly in low Earth orbit.
Subsequent Xihe motherships were constructed in the Star Port Station. Located at LEO, the Star Port Station is a large orbital shipyard capable of assembling and outfitting large spacecraft. The station provides a controlled environment for construction, allowing for more efficient assembly and testing of the motherships before they embark on their missions. Instead of Vulture Shuttles, components and modules for the motherships are delivered to the Star Port Station using larger cargo spacecraft such as Qingtian, streamlining the construction process.
## History
The first batch of three Xihe motherships were constructed between 2050 and 2055, with XH-01 (Xihe) being the first to be completed in early 2052. During the construction of XH-01, several design improvements were identified that would enhance the performance and capabilities of subsequent motherships, and a possible new configuration for the propulsion system was proposed. These improvements led to the development of the Stellaria-class motherships, which incorporated the new Lightspeed Engine, a more advanced propulsion system that offered improved performance and efficiency over the original mass driver propulsion system used in XH-01. As a result, XH-02 and XH-03—the second and third Xihe motherships—were redesigned to incorporate the new engine and other enhancements, leading to the creation of the Stellaria class. They were later redesignated as ST-01 (Stellaria) and ST-02 (Kristen), respectively.
Due to the growing need for Mars One base expansion and Europa Research Outpost construction, Stellaria and Kristen were built as transitional designs between Xihe class and Stellaria class motherships, essentially Xihe class motherships with the new Lightspeed Engine. This allowed them to enter service much earlier than originally planned. Both have already entered service supporting the Mars One and Europa Research Outpost missions. Upgrades are planned to bring them closer to the full Stellaria-class specifications.
Near the completion of Kristen, construction of the second batch of Xihe motherships began in 2054 at Star Port station, with XH-02 (Taibai) being completed in 2056. XH-02 incorporated several design improvements identified during the construction of the first batch, including enhanced radiation shielding, upgraded life support systems, and improved scientific research capabilities. XH-03 (Changxi) was under construction between February 2058 and November 2059, and is currently undergoing testing in LEO. XH-04, whose name has not yet been announced, is currently under construction at Star Port station, with completion expected in mid 2061.
## Naming confusion
The second and third Xihe motherships were originally intended to be XH-02 and XH-03 respectively. However, during the construction of XH-02, the decision was made to redesignate it as ST-01 (Stellaria) after significant design changes were made to incorporate the new Lightspeed Engine and other enhancements. Similarly, XH-03 was also redesignated as ST-02 (Kristen) for the same reasons.
Stellaria and Kristen serve as transitional designs between the Xihe class and the more advanced Stellaria-class motherships. They are essentially Xihe-class motherships with the new Lightspeed Engine. Both are already in service supporting the Mars One and the Europa Research Outpost.
## Specifications
### Performance
- Propulsion: Endurance Mass Driver Propulsion System
- Main Engine Thrust: 2400 kN (Standard Mode), 3800 kN (High-Thrust Mode)
- Specific Impulse: 500,000 s (Standard Mode), 250,000 s (High-Thrust Mode)
- Delta-V: 1700 km/s (with 300-ton payload)
### Weight and Dimensions
- Fuel Capacity: 196.3 tons
- Wet Mass: 365.3 tons without payload
- Length: 83.4 meters
- Diameter: 25 meters (at habitat ring)
### Payload Capacity
- Maximum Payload: 300 tons (including planetary surface exploration vehicles)
- Towing Capacity: Up to 200 tons at the front docking port, 100 tons at each side docking port
### Crew
- Crew Capacity: 15 (sustainable for up to 5 years), 30 (short-term missions)
- Life Support supplies: 315 days for 15 crew members without greenhouse support
## Missions
Xihe motherships are primarily used for crewed exploration missions to other planets and celestial bodies within the solar system. These missions typically involve a combination of scientific research, celestial body surface exploration, and technology demonstration. The mothership serves as a mobile base of operations, allowing the crew to conduct extended missions in deep space.
The first Xihe mothership, Xihe (XH-01), carried crew to Mars and the moons of Jupiter for exploration and research. It has been heavily involved in the construction of the Mars One base and Europa Research Outpost, providing transportation, logistics support, and scientific expertise for these ambitious projects.
Xihe was used for crew rotation and supply runs to Mars One, as well as ferrying construction materials and equipment for the base's expansion. The mothership's towing capabilities allowed it to transport large planetary surface exploration vehicles and modules needed for the base's development.
As the construction of Europa Research Outpost started, another Xihe-class mothership, Taibai, was built to support crew rotation and base expansion of Mars One, while Xihe was reassigned to support the Europa mission. Xihe transported crew and supplies to Europa, as well as scientific instruments and equipment needed for the outpost's research activities.
After the completion of Europa Research Outpost and an expedition to Europa, Xihe was brought back to Star Port for refit and maintenance. Several upgrades from Taibai were retrofitted onto Xihe, including improved radiation shielding, upgraded life support systems, enhanced scientific research capabilities, and better docking hubs. These upgrades ensured that Xihe remained at the forefront of interplanetary exploration technology.
### Mission Planning
With a total delta-v budget of 1700 km/s when carrying a 300-ton payload, Xihe motherships usually perform direct transfers to their destinations. There are two typical trajectory profiles: standard and fast-travel. Standard travel profiles are missions with less than 200 km/s departure burns, allowing single Earth-Mars trips to be completed between 20 and 140 days depending on planetary alignment. Fast-travel profiles can reduce travel time to as little as 8 days for Earth-Mars trips when the planets are perfectly aligned, but require higher delta-v burns of up to 250 km/s each, significantly increasing fuel consumption.
With the high delta-v capacity, Xihe motherships usually plan their mission profiles to stay within a certain travel time, which means altering the burn durations to achieve the desired travel time. Typical Mars missions will aim for a total travel time of around 30 days one-way, while missions to Jupiter's moons will aim for around 70 days one-way.
## Stellaria
Stellaria is a class of next-generation interplanetary exploration mothership, building upon the design and capabilities of the Xihe class. It features several advancements in propulsion, life support, and scientific research capabilities, making it well-suited for extended missions to distant planets and celestial bodies within the solar system.
It is envisioned that Stellaria will take over the roles of Outer Solar System explorations once it enters service, allowing Xihe-class motherships to focus on inner solar system missions and support roles.
## Fleet
| Name | Serial Number | Status | Notes |
|-------------|----------------|--------------------|--------------------------------------------|
| Xihe | XH-01 | Active | First of its class, supporting Mars and Europa missions. |
| Stellaria | ST-01 | Active | Transitional design to Stellaria class, equipped with Lightspeed Engine. |
| Kristen | ST-02 | Active | Transitional design to Stellaria class, equipped with Lightspeed Engine. |
| Taibai | XH-02 | Active | Second of its class, supporting Mars One base expansion. |
| Changxi | XH-03 | Testing in LEO | Third of its class, intended to support Europa Research Outpost rotation and Venus exploration. |
| Unnamed | XH-04 | Under Construction | Fourth of its class, expected completion in mid 2061. |
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