KSP_project/data/wiki/stellaria_mothership_en.html

<style>
.wiki-article { max-width: 1180px; margin: 0 auto; padding: 24px 32px 48px; color: #202122; background: #fff; font-family: sans-serif; font-size: 14px; line-height: 1.65; }
.wiki-article h1, .wiki-article h2 { font-family: "Linux Libertine", Georgia, "Times New Roman", serif; font-weight: normal; border-bottom: 1px solid #a2a9b1; }
.wiki-article h1 { margin: 0 0 8px; font-size: 2.15em; line-height: 1.25; }
.wiki-article h2 { clear: both; margin: 1.35em 0 0.6em; padding-bottom: 0.18em; font-size: 1.55em; }
.wiki-article h3 { margin: 1.05em 0 0.35em; font-size: 1.18em; font-weight: bold; }
.wiki-article p { margin: 0.45em 0 0.85em; }
.wiki-article a { color: #0645ad; text-decoration: none; }
.wiki-article a:hover { text-decoration: underline; }
.wiki-article ul, .wiki-article ol { margin: 0.35em 0 0.9em 1.65em; padding: 0; }
.wiki-article li { margin-bottom: 0.18em; }
.wiki-article .infobox { float: right; clear: right; width: 330px; margin: 0 0 18px 24px; border: 1px solid #a2a9b1; border-collapse: collapse; background: #f8f9fa; font-size: 88%; line-height: 1.45; }
.wiki-article .infobox caption { padding: 8px; background: #eaecf0; border: 1px solid #a2a9b1; border-bottom: 0; font-weight: bold; font-size: 1.12em; }
.wiki-article .infobox caption span { display: block; font-size: 0.92em; font-weight: normal; }
.wiki-article .infobox td { border: 1px solid #a2a9b1; padding: 6px 8px; vertical-align: top; }
.wiki-article .image-placeholder { min-height: 150px; border: 1px dashed #72777d; background: #eaecf0; color: #54595d; display: flex; align-items: center; justify-content: center; padding: 10px; text-align: center; box-sizing: border-box; }
.wiki-article .infobox .image-placeholder { min-height: 185px; }
.wiki-article .thumb { width: 270px; border: 1px solid #c8ccd1; background: #f8f9fa; padding: 3px; font-size: 88%; line-height: 1.4; box-sizing: border-box; }
.wiki-article .tright { float: right; clear: right; margin: 0.35em 0 1em 1.4em; }
.wiki-article .thumbcaption { padding: 4px 3px 2px; text-align: left; color: #202122; }
.wiki-article .toc { display: inline-block; min-width: 260px; margin: 0.45em 0 1.2em; padding: 8px 12px; border: 1px solid #a2a9b1; background: #f8f9fa; font-size: 92%; }
.wiki-article .toc-title { text-align: center; font-weight: bold; margin-bottom: 4px; }
.wiki-article .toc ol { margin: 0 0 0 1.5em; }
.wiki-article > table:not(.infobox) { width: 100%; margin: 1em 0; border-collapse: collapse; font-size: 92%; background: #fff; }
.wiki-article > table:not(.infobox) th, .wiki-article > table:not(.infobox) td { border: 1px solid #a2a9b1; padding: 6px 8px; text-align: left; vertical-align: top; }
.wiki-article > table:not(.infobox) th { background: #eaecf0; font-weight: bold; }
.wiki-article > table:not(.infobox) tr:nth-child(even) td { background: #f8f9fa; }
@media (max-width: 820px) { .wiki-article { padding: 18px 16px 36px; } .wiki-article .infobox, .wiki-article .thumb { float: none; width: 100%; margin: 0.75em 0 1em; } .wiki-article .toc { display: block; } }
</style>
<article class="mw-parser-output wiki-article">
<h1 id="stellaria-class-interplanetary-exploration-mothership">Stellaria-class interplanetary exploration mothership</h1>
<table class="infobox">
<caption>Stellaria-class interplanetary exploration mothership<span>Stellaria class</span></caption>
<tbody>
<tr><td><div class="image-placeholder">Stellaria-class side-view image placeholder</div><div class="thumbcaption">The Stellaria class expands central volume, life support, and propulsion capability for longer outer-planet missions.</div></td></tr>
<tr><td><b>Type</b>: Large crewed interplanetary exploration mothership</td></tr>
<tr><td><b>Technical foundation</b>: Operational experience from the Xihe class</td></tr>
<tr><td><b>Lead ship</b>: Stellaria (ST-01)</td></tr>
<tr><td><b>Main roles</b>: Outer-planet exploration, base construction, long-duration science, and deep-space transport</td></tr>
<tr><td><b>Key facilities</b>: Dual artificial-gravity rings, central expansion section, cryosleep capsules, RA-100 communications arrays</td></tr>
<tr><td><b>Length</b>: 107.5 m</td></tr>
<tr><td><b>Maximum diameter</b>: 25 m at the artificial-gravity habitation rings</td></tr>
<tr><td><b>Long-duration crew</b>: 30</td></tr>
<tr><td><b>Short-duration crew</b>: 60</td></tr>
<tr><td><b>Standard payload</b>: 500 t</td></tr>
<tr><td><b>Typical carried vehicles</b>: Two Echo shuttles or other compatible ferry shuttles</td></tr>
<tr><td><b>Propulsion</b>: Lightspeed mass-driver engine</td></tr>
<tr><td><b>Delta-v</b>: 3500 km/s standard configuration; 4500 km/s ST-01/02 early high-delta-v configuration</td></tr>
<tr><td><b>Construction site</b>: Star Port Station and large orbital shipyards</td></tr>
<tr><td><b>Current status</b> (as of 2060-03-12): ST-01 en route to Neptune for the outer Solar System exploration mission; ST-02 and ST-03 active</td></tr>
</tbody></table>

<p>The <b>Stellaria-class interplanetary exploration mothership</b> is a crewed deep-space mothership class developed after the Xihe class. It is used for long-duration interplanetary missions, outer-planet moon surveys, off-world base construction support, and large scientific expeditions. The English name of the class is <b>Stellaria</b>. The class absorbs operational experience from Xihe-class Mars, Jovian-system, and base-support missions while enlarging central volume, life support, long-duration crew capacity, and main-propulsion capability through the Lightspeed mass-driver engine.</p>
<p>As of March 2060, the Stellaria class has three ships in active service (ST-01 Stellaria, ST-02 Stellaria NEXT, ST-03), with one under construction (ST-04). The lead ship, Stellaria, is currently executing Outer Solar System exploration mission 1, bound for Neptune. The Jinwu-class cargo ship fleet, JW-01 through JW-03, provides heavy cargo delivery throughout the Solar System, with a single-trip capacity exceeding 300 tonnes, purpose-designed for the construction and resupply of large off-world facilities such as Mars One Base and Europa Research Outpost. ST-02 and ST-03 remain on routine service supporting Europa Outpost construction and Mars missions respectively.</p>
<p>The standard Stellaria design can support 30 crew for missions lasting decades and can carry 60 people in short-duration configurations. It retains the axial-spine layout, but adds dual artificial-gravity rings, a central expansion section, cryosleep capsules, larger thermal-control capacity, and stronger towing and berthing interfaces. The class does not land on planetary or moon surfaces; target-system access is handled by Echo shuttles, Amalthea multipurpose vehicles, and other carried vehicles.</p>
<p>ST-01 and ST-02 are early Stellaria-class ships using a high-delta-v, lower-payload deep-space configuration. ST-03 and later standard ships emphasize larger central volume, higher payload capacity, longer life-support endurance, and greater mission redundancy. Both configurations belong to the Stellaria-class lineage, with differences in mission focus, payload allocation, and long-duration habitation capability.</p>
<p>The Stellaria class marks the expansion of deep-space motherships from interplanetary transfer platforms into multi-body expedition platforms. In addition to the main transfer phase, it provides scientific laboratories, medical capacity, sample handling, crew rotation, cryosleep support, and carried-vehicle servicing inside target systems.</p>

<nav class="toc" aria-label="Contents">
<div class="toc-title">Contents</div>
<ol>
<li><a href="#design-origin">Design origin</a></li>
<li><a href="#development-background">Development background</a></li>
<li><a href="#overall-configuration">Overall configuration</a></li>
<li><a href="#central-expansion-section">Central expansion section</a></li>
<li><a href="#propulsion-and-power">Propulsion and power</a></li>
<li><a href="#carried-vehicles-and-ferry-shuttle-tasks">Carried vehicles and ferry-shuttle tasks</a></li>
<li><a href="#construction-and-early-ships">Construction and early ships</a></li>
<li><a href="#st-01-mission-record">ST-01 mission record</a></li>
<li><a href="#mission-roles">Mission roles</a></li>
<li><a href="#operations-and-maintenance">Operations and maintenance</a></li>
<li><a href="#safety-and-mission-constraints">Safety and mission constraints</a></li>
<li><a href="#specifications">Specifications</a></li>
<li><a href="#fleet-status">Fleet status</a></li>
<li><a href="#see-also">See also</a></li>
</ol>
</nav>

<h2 id="design-origin">Design origin</h2>
<p>The Stellaria class continues the axial modularity, artificial-gravity habitation rings, reinforced docking hubs, and propulsion-isolation truss concepts proven by the Xihe class. Xihe missions to Mars, Europa, and the Jovian system demonstrated the viability of large motherships as mobile deep-space outposts, while also revealing limits in crew capacity, payload redundancy, and sustained outer-planet operations.</p>
<p>The Stellaria design goal was to expand mission margin while keeping the reliable Xihe architecture. Major changes include dual artificial-gravity habitation rings, a larger greenhouse and closed-loop life-support system, a central expansion section, cryosleep capsules, stronger long-range communications, reinforced towing interfaces, and the Lightspeed mass-driver engine. These changes make the class more suitable for Saturn, Uranus, Neptune, and multi-moon survey missions.</p>

<h2 id="development-background">Development background</h2>
<p>As Xihe-class missions became routine, Mars-base and Europa-outpost needs expanded rapidly. Early motherships could perform interplanetary transfer and base support, but outer-planet missions required larger life-support reserves, stronger radiation protection, longer autonomy, and more complex carried-vehicle coordination. Saturn-system missions, multi-target Jovian-moon campaigns, and asteroid-belt missions required a mothership that could serve as transport hub, laboratory platform, supply store, and medical backup center during one expedition.</p>
<p>The Stellaria program was driven by two major requirements: transporting larger base modules, surface vehicles, and long-duration supplies for off-world construction; and giving scientific expeditions longer autonomous operating time. Compared with Xihe, Stellaria was designed not only to arrive and return, but also to remain in a target system, visit multiple bodies, and rotate crew between cryosleep, artificial-gravity habitation, and surface work.</p>
<p>Stellaria is the English name used for the class. In the mothership naming system, the name marks the expansion from inner-Solar-System exploration toward broader deep-space operations.</p>

<h2 id="overall-configuration">Overall configuration</h2>
<p>The Stellaria class arranges its forward docking port, command center, artificial-gravity habitation modules, greenhouse module, central expansion section, truss, and propulsion module along the central axis. Compared with Xihe, the middle section is larger and contains more mission facilities, allowing one expedition to support scientific work, base construction, surface-vehicle maintenance, and cryosleep rotation at the same time.</p>
<p>The forward section includes a 5 m large docking port for Qingtian cargo vehicles, heavy base modules, and towed payloads. Side and central-expansion ports support ferry shuttles, service craft, temporary laboratories, and cargo modules. These ports are structurally reinforced for acceleration, attitude changes, and towing operations.</p>
<p>The command center inherits the Xihe flight-control arrangement and integrates navigation, communications, flight control, and dual airlocks. Dual artificial-gravity rings produce about 0.41 g at roughly 4 RPM. The greenhouse module uses hydroponics, LED lighting, and climate control for food supplementation, air regeneration, and waste cycling.</p>

<h2 id="central-expansion-section">Central expansion section</h2>
<figure class="thumb tright"><div class="image-placeholder">Central expansion section image placeholder</div><figcaption class="thumbcaption">The central expansion section provides additional laboratory, storage, cryosleep, and docking capacity.</figcaption></figure>
<p>The central expansion section consists of one central module and four side modules. It is the main structural feature distinguishing the Stellaria class from Xihe. The central module links the forward and aft ship and carries large emergency consumable stores. The four side modules contain crew cabins, scientific laboratories, docking hubs, EVA airlocks, and cryosleep capsules. A standard ship carries 40 cryosleep capsules for long-duration crew rotation, medical isolation, and emergency return-window waiting.</p>
<p>Some side modules carry observation cupolas for science and crew use; others carry RA-100-class long-range communications arrays. Each side module has multiple docking ports, including 1.875 m, 1.25 m, and some 2.5 m interfaces. Smaller aft-side 1.25 m ports are limited by the center-module geometry and are normally used by smaller craft rather than standard Amalthea vehicles.</p>

<h2 id="propulsion-and-power">Propulsion and power</h2>
<p>The main propulsion system is the Lightspeed mass-driver engine. Powered by an 80 TW-class Ark cold-fusion reactor, it accelerates reaction mass to extremely high exhaust velocity and provides far greater delta-v than the Xihe-class Perseverance system. The propulsion module also includes reaction-mass tanks, attitude-control thrusters, communications equipment, and large radiators.</p>
<p>The Lightspeed engine has standard and high-thrust modes. Standard mode provides about 4800 kN of thrust and a specific impulse of about 3,000,000 s for efficient cruise far from crewed spacecraft and planetary atmospheres. High-thrust mode provides about 7200 kN and a specific impulse of about 1,500,000 s for orbital insertion, departure, and near-body maneuvering. Both modes have strict plume-clearance rules and cannot be used in atmosphere or near crewed vehicles.</p>
<p>A standard Stellaria-class ship can provide about 3500 km/s of total delta-v with a 500 t payload. ST-01 and ST-02 use an early high-delta-v configuration with more reaction mass and lower payload, reaching about 4500 km/s with a 300 t payload. This makes the early ships well suited to fast deep-space transfers and exploration missions.</p>
<p>The high-energy reactor and engine make the propulsion module the most tightly controlled area of the ship. The truss section increases separation from crewed spaces, while radiators reject waste heat during engine burns and long cruise. Smaller backup arc reactors cannot drive the main engine, but can sustain life support, attitude control, communications, and essential thermal loads.</p>

<h2 id="carried-vehicles-and-ferry-shuttle-tasks">Carried vehicles and ferry-shuttle tasks</h2>
<p>Stellaria-class outer-planet missions commonly carry two Echo shuttles or other compatible vehicles as ferry shuttles. The mothership remains in a high-safety-margin orbit within the target system, while carried vehicles handle personnel, samples, and light cargo between the mothership, planetary surfaces, major moons, temporary platforms, and outposts. This prevents the mothership from repeatedly entering low or hazardous orbits.</p>
<p>Echo handles fast, light, reusable crew transport in the Stellaria system. In gas-giant expeditions, two Echo shuttles usually operate under mutual-backup rules: one performs descent, moon-to-moon transfer, or sample recovery while the other remains berthed or nearby. When a mission needs heavy surface equipment, engineering work, or airless-body operations, Echo can be paired with an Amalthea multipurpose vehicle.</p>
<p>Enterprise supports Stellaria-class operations mainly during construction, refit, pre-departure supply, and post-return unloading. It can transfer small modules, mission packages, engineering teams, and 25 t-class supply batches, but it is not the standard ferry shuttle carried through long outer-planet expeditions.</p>
<p>ST-01 missions also used Callisto multipurpose vehicles for Mars and Europa surface transfer. The Stellaria interface system is not tied to one vehicle type; it supports Echo, Amalthea or Callisto-type MPVs, and other compatible ferry-shuttle combinations.</p>
<table>
<thead><tr><th>Expedition scenario</th><th>Mothership task</th><th>Carried-vehicle task</th></tr></thead>
<tbody>
<tr><td>Mars-system expansion</td><td>Transport base modules, supplies, and crew while remaining in high Mars orbit or near a moon.</td><td>Echo shuttles serve Mars, Phobos, and Deimos; Amalthea-type vehicles support heavier surface work.</td></tr>
<tr><td>Saturn-system survey</td><td>Transfer within the Saturn system and support phased moon surveys.</td><td>Echo performs crew and sample fast links while a second shuttle remains in backup.</td></tr>
<tr><td>Jovian-moon mission</td><td>Avoid high-radiation zones while providing communications, science, and life support.</td><td>Carried vehicles enter moon vicinity or surface windows, complete short operations, and return.</td></tr>
<tr><td>Deep-space emergency</td><td>Provide reception, medical care, cryosleep, and return-window waiting capacity.</td><td>Echo performs nearby rescue, crew transfer, and critical sample movement.</td></tr>
</tbody></table>

<h2 id="construction-and-early-ships">Construction and early ships</h2>
<p>The Stellaria-class mothership traces its origin to 2050. It began as a basic mothership project initiated on 2050-09-15, conceived as a larger deep-space platform building on Xihe-class experience. After initial structural construction, the project was suspended on 2053-02-02 for technical reassessment and resource reallocation, after 871 days of work.</p>
<p>On 2053-05-11, the vessel was reconfigured as ST-01 Stellaria, formally entering the Stellaria-class program. The preparation phase lasted nearly one year, completing on 2054-04-28. During this phase, only the Lightspeed mass-driver engine was installed on the existing structure -- the rest of the ship remained essentially Xihe-class standard equipment. This gave ST-01 a hybrid configuration for its early missions: a Stellaria propulsion core mated to Xihe-class mission modules.</p>
<p>After preparation, ST-01 entered a 102-day commissioning phase (2054-05-12 to 2054-08-22), conducting full-system tests in Earth orbit, geostationary orbit, and lunar orbit. This phase verified the compatibility between the Lightspeed engine and the inherited Xihe-class modules, while providing the crew with their first hands-on experience operating a Stellaria-class ship.</p>
<p>Following commissioning, ST-01 executed a deep-space test mission (2054-09-07 to 2054-11-28): an uncrewed flight to the Sun-Earth L2 Lagrange point, testing long-distance cruise, autonomous navigation, long-range communications, and thermal control performance far from Earth. After successful return, ST-01 underwent 90 days of pre-service maintenance (2054-12-01 to 2055-02-28), during which reaction mass was replenished, life-support systems were tuned, the greenhouse received its initial inoculation, and the ship was prepared for its first crewed mission.</p>
<p>It was not until late 2059 that ST-01 finally reached full Stellaria-class specifications. During the Star Port upgrade (2059-11-25 to 2060-02-10), the remaining central expansion side modules, components for the second artificial-gravity ring, enhanced radiator systems, and mission-specific payloads were all installed. ST-01 thus transformed from its early hybrid configuration into a complete Stellaria-class mothership, ready for its first outer Solar System expedition.</p>

<p>Stellaria-class construction is based at Star Port Station and large orbital shipyards. ST-01 and ST-02 are early ships optimized for fast deep-space exploration, outer-planet mission validation, and high-delta-v transfer. ST-03 and later standard ships emphasize larger payloads, greater crew redundancy, and long-duration multi-body expeditions. The difference between early and standard ships lies mainly in mission configuration, payload allocation, and long-duration habitation capacity.</p>
<p>After Star Port Station entered operation, later Stellaria-class motherships were assembled in large orbital shipyards. Standard construction usually delivered the central expansion section, command center, artificial-gravity modules, greenhouse module, truss, propulsion module, forward docking port, radiators, and fuel tanks through multiple Qingtian cargo-vehicle launches. Orbital shipyard assembly improved module size, integration accuracy, and test coverage.</p>
<p>The early configuration offered high delta-v and mission response. ST-01 could support Mars One construction, Europa outpost construction, and outer-planet surveys; ST-02 extended personnel rotation, scientific payload delivery, and deep-space exploration roles. Their missions provided operational data for later standard ships.</p>
<table>
<thead><tr><th>Construction batch</th><th>Main components</th><th>Assembly meaning</th></tr></thead>
<tbody>
<tr><td>Batch 1</td><td>Central expansion section and center modules</td><td>Established the core volume and cryosleep foundation of the class.</td></tr>
<tr><td>Batch 2</td><td>Command center and artificial-gravity habitation modules</td><td>Completed long-duration crew space, navigation control, and medical-support capability.</td></tr>
<tr><td>Batch 3</td><td>Greenhouse module and remaining center modules</td><td>Built long-duration life support, food supplementation, and emergency reserves.</td></tr>
<tr><td>Batch 4</td><td>Truss and propulsion module</td><td>Completed main propulsion, power, thermal control, and radiation separation.</td></tr>
<tr><td>Batch 5</td><td>Forward docking port and added command components</td><td>Established heavy towing, Qingtian docking, and carried-vehicle coordination capability.</td></tr>
<tr><td>Batch 6</td><td>Fuel tanks, radiators, and remaining propulsion hardware</td><td>Closed the propulsion system and completed whole-ship thermal acceptance.</td></tr>
</tbody></table>

<h2 id="st-01-mission-record">ST-01 mission record</h2>
<p>ST-01 Stellaria is the lead ship of the class. It validated high-delta-v transfer, ferry-shuttle operation, long-duration residence, and outer-planet mission support. Since its first mission in 2055, ST-01 has executed a series of landmark expeditions -- inner Solar System exploration, Mars base construction, Europa outpost construction, and Saturn exploration -- establishing the fundamental operating pattern of Stellaria-class multi-body expedition motherships. Its complete mission record follows.</p>

<h3 id="st-01-inner-solar-system-exploration-mission-1">Inner Solar System exploration mission 1 (2055-03 to 2056-04)</h3>
<p>The maiden operational mission of ST-01 Stellaria was an audacious inner Solar System expedition. On 2055-03-20, ST-01 departed Star Port Station at an injection velocity of 127 km/s, bound for Mercury. After only 28 days of flight, ST-01 arrived at Mercury on 2055-04-17, setting a then-record for the fastest interplanetary transfer.</p>
<p>This was the <b>first crewed Mercury mission</b> in human history. From 2055-04-18 to 2055-08-14, ST-01's crew conducted 118 days of surface science operations on Mercury, carrying out geological sampling, solar-wind interaction studies, and life-support system validation under the extreme thermal conditions of the innermost planet. Surface EVA operations faced daytime temperatures exceeding 400 degrees C, but ST-01's enhanced thermal-control systems performed flawlessly.</p>
<p>After the Mercury segment, ST-01 transferred to Venus on 2055-08-15 at 85 km/s. The Venus operations phase ran from 2055-10-01 to 2056-03-24, spanning 175 days, and achieved the <b>first crewed Venus mission</b>. Due to Venus's extreme surface temperature and pressure, no surface landing was attempted. Instead, the Callisto MPV conducted a comprehensive in-situ science campaign in the Venusian upper atmosphere, including atmospheric composition analysis, cloud-layer dynamics research, and greenhouse-effect modeling. This mission validated Stellaria-class thermal and radiation protection in the high-heat environment near the Sun, establishing operational benchmarks for all subsequent deep-space missions.</p>
<p>For the return leg, ST-01 departed Venus on 2056-03-24 at 75 km/s and reached Earth in just 19 days, arriving on 2056-04-12. Remarkably, this was ST-01's <b>first mission</b> -- it completed a more challenging inner Solar System campaign before ever flying a Mars mission, demonstrating the formidable deep-space capability of the Stellaria class.</p>

<h3 id="st-01-mars-one-construction-mission-2">Mars One construction mission 2 (2056-06 to 2056-11)</h3>
<p>Less than two months after returning from the inner Solar System, ST-01 was assigned a new mission: the <b>first crewed Mars mission using a Stellaria-class mothership</b>. On 2056-06-02, ST-01 departed Earth carrying large base-expansion modules and rotation crew, employing an ultra-fast transfer trajectory. Thanks to the Lightspeed engine's exceptional performance, the Earth-to-Mars transit took only 29 days, shattering the crewed Mars transfer time record.</p>
<p>Upon arrival at Mars, ST-01 conducted base-construction and scientific operations from 2056-07-03 to 2056-10-12, a 101-day campaign in the Martian system. The most historic moment of the mission occurred on 2056-09-17: for the <b>first time in human history, two motherships conducted a crew handoff at Mars</b>. ST-01's crew met the XH-01 Xihe crew, which was already operating at Mars One Base, executing a cross-generational mothership crew rotation and mission handover in Mars orbit. This milestone established the multi-mothership coordinated operations model.</p>
<p>The return transit departed Mars on 2056-10-15, using a blistering 212 km/s fast return trajectory that brought ST-01 back to Earth in just 19 days, arriving on 2056-11-03. This mission demonstrated Stellaria's speed advantage over the Xihe class in unmistakable terms, cementing the Lightspeed engine's central role in the fleet's rapid-response architecture.</p>

<h3 id="st-01-europa-outpost-construction-mission-1">Europa Outpost construction mission 1 (2056-12 to 2057-12)</h3>
<p>Following the Mars mission, ST-01 rapidly pivoted to a far more distant objective: the Jovian system. On 2056-12-15, ST-01 performed its Jupiter injection burn at 165 km/s. After 72 days of deep-space cruise, it arrived in the Jupiter system on 2057-02-25. This was the <b>first crewed Europa mission</b>, and the single most demanding test of Stellaria-class operation in the Jovian radiation environment and long-delay communications conditions.</p>
<p>Within the Jupiter system, ST-01 positioned itself in a high-safety-margin orbit, deliberately avoiding the most severe radiation belts. It served as a mobile command and support platform, while actual Europa surface transfer was executed by Callisto MPVs. From 2057-02-27 to 2057-10-01, a total of six crewed ferry flights were completed between the mothership and the Europa surface, delivering personnel and critical equipment for the construction of Europa Research Outpost. Ice-penetration drilling, subsurface ocean detection, and biosignature analysis yielded important scientific results during this period.</p>
<p>For the return leg, ST-01 departed on 2057-10-04, executing a 216 km/s fast trajectory that covered the Jupiter-Earth distance in 77 days. ST-01 arrived at Earth on 2057-12-20. This year-long expedition established Europa Outpost's foundational infrastructure and, critically, validated the Stellaria class's long-duration autonomous operations capability in the outer Solar System's extreme environment.</p>

<h3 id="st-01-major-overhaul-and-upgrade">Major overhaul and upgrade (2058-01 to 2058-05)</h3>
<p>Following the Europa expedition, ST-01 entered the most significant maintenance and upgrade period of its service life. From 2058-01-05 to 2058-05-15, ST-01 underwent a 130-day major injection-style refit at Star Port Station. The three core upgrade projects were: <b>installation of a new complete greenhouse module</b>, significantly expanding closed-loop food production and air regeneration capacity; <b>comprehensive life-support system upgrade</b>, improving water-recycling efficiency, atmospheric composition control precision, and emergency redundancy levels; and <b>installation of the second complete artificial-gravity habitation ring</b>, making ST-01 the first mothership in the fleet with dual-ring redundancy -- even if one ring entered maintenance or reduced-power operation, the entire crew could still enjoy artificial-gravity conditions.</p>
<p>This overhaul dramatically improved ST-01's long-duration self-sufficiency and crew-health assurance. After the upgrade, ST-01 became the most capable deep-space vessel in the fleet, laying a solid foundation for the subsequent 17-month Saturn expedition. Lessons from this overhaul directly influenced the factory-configuration designs of the later ST-02 and ST-03.</p>

<h3 id="st-01-saturn-exploration-mission-1">Saturn exploration mission 1 (2058-06 to 2059-11)</h3>
<p>Fresh from its major overhaul, ST-01 embarked on the most ambitious expedition of its career. On 2058-06-01, ST-01 departed Earth at a staggering 210 km/s injection velocity, launching the <b>first crewed Saturn mission</b> in human history. After 133 days of deep-space cruise, ST-01, carrying two Echo ferry shuttles, arrived in the Saturn system on 2058-10-12, expanding the human presence to the outer gas-giant region of the Solar System for the first time.</p>
<p>Within the Saturn system, ST-01 conducted an extensive 262-day science campaign (2058-10-12 to 2059-07-01). The centerpiece of the mission was the <b>first human surface operations on Titan</b>. Echo ferry shuttles executed descent, landing, and sample-collection missions in Titan's dense atmosphere, conducting in-depth studies of Titan's methane lakes, organic compounds, and atmospheric chemistry. Additionally, ST-01's carried vehicles performed multiple flyby sampling passes of the Enceladus ice plumes, collecting precious samples of subsurface ocean ejecta. Close-range scientific observations of Saturn's ring system provided unprecedented data for ring-dynamics research.</p>
<p>Throughout the mission, ST-01 also functioned as an active science-relay satellite, serving as the communications hub and preliminary sample-analysis center for the Saturn system, bridging data relay between the various vehicles and Earth. The return leg began on 2059-07-01 at 162 km/s, spanning 146 days, with ST-01 returning safely to Earth on 2059-11-24. This nearly 18-month expedition proved that humanity had achieved the capability for long-duration comprehensive scientific campaigns at Saturn-distance from Earth.</p>

<h3 id="st-01-star-port-upgrade">Star Port upgrade (2059-11 to 2060-02)</h3>
<p>Upon returning from Saturn, ST-01 entered Star Port Station on 2059-11-25 for its second critical upgrade in service. This 77-day upgrade program (through 2060-02-10) carried special significance: it marked ST-01's formal transformation from an early hybrid configuration into a <b>complete, full-specification Stellaria-class mothership</b>.</p>
<p>Previously, despite carrying the Lightspeed engine -- a Stellaria-class core propulsion system -- the rest of ST-01's hull had largely remained in the Xihe-class standard configuration. It was, in essence, a hybrid vessel: a Stellaria propulsion core mated to Xihe-class mission modules. The Star Port upgrade closed this long-standing structural gap: the remaining side modules of the central expansion section were all installed, the complete components of the second artificial-gravity ring were assembled, the RA-100-class long-range communications array was comprehensively upgraded, and enhanced radiation shielding covered previously unprotected hull sections. After passing the complete system closure test, ST-01 had finally evolved from a partial-specification vessel into a true, fully-realized Stellaria-class deep-space mothership. At this moment, ST-01 was ready for its next chapter: the farthest-distance crewed space mission in human history.</p>

<h3 id="st-01-outer-solar-system-exploration-mission-1">Outer Solar System exploration mission 1 (2060-02 to ongoing)</h3>
<p>Just one day after completing its Star Port upgrade, ST-01 departed on 2060-02-11 at a departure velocity of 160 km/s, formally leaving Earth's gravitational influence on 2060-02-12 and setting course for the Neptune system. This is the Stellaria class's first outer Solar System expedition, and the <b>farthest-distance crewed space mission in human history</b> -- no crewed spacecraft had previously reached Neptune-orbit distance.</p>
<p>The mission's primary scientific objectives include: in-situ exploration of Neptune's atmosphere, and a crewed landing and science campaign on Triton, Neptune's largest moon. Triton is considered one of the most promising candidates for a subsurface ocean in the Solar System, and its unique retrograde orbit and cryovolcanic activity hold extraordinary scientific value. The mission also includes plans for flyby observations of Neptune's ring system and other minor moons.</p>
<p>As of 2060-03-12, ST-01 is in its cruise phase, en route to Neptune. This is a multi-year expedition that represents the cutting edge of contemporary human deep-space exploration. ST-01's current voyage carries the expectations of humanity's exploration of the Solar System's farthest frontier, and its mission results will have profound implications for understanding the formation and evolution of outer Solar System bodies.</p>

<h2 id="mission-roles">Mission roles</h2>
<p>The Stellaria class is mainly used for outer-planet and multi-body crewed exploration. It can also support off-world base construction, deep-space science, mobile mission control, and heavy payload towing. Its standard 500 t payload capacity is suited to base modules, surface vehicles, long-duration supplies, scientific instruments, and major repair equipment. The early high-delta-v ST-01/02 configuration carries less payload but supports faster deep-space and long-distance science missions.</p>
<p>Within the wider fleet, Stellaria handles the main mothership transfer and long-duration platform role; Echo provides ferry-shuttle and crew fast-link service; Amalthea-type vehicles support surface engineering and airless-body operations; Enterprise supports mothership construction, refit, and supply; Vulture Block 2 and Qingtian cargo vehicles support large orbital construction and heavy logistics.</p>

<h2 id="operations-and-maintenance">Operations and maintenance</h2>
<p>Stellaria-class operations resemble those of a large orbital facility. Before departure, the mothership completes propulsion cold checks, reaction-mass loading, cryosleep testing, greenhouse-cycle confirmation, dual-ring balance testing, carried-vehicle attachment checks, and sample-isolation rehearsals at Star Port Station. During the mission, maintenance crews monitor radiator deployment, reactor output, life-support loops, communications-array pointing, and external-berth interfaces.</p>
<p>After return, maintenance is normally divided into propulsion and structure, life support, and mission payloads. Propulsion and structure work includes engine nozzles, radiators, trusses, and towing interfaces. Life-support work includes the greenhouse, air regeneration, water processing, and cryosleep systems. Mission-payload work includes sample handling, surface-vehicle cleaning, communications-array replacement, and scientific-instrument calibration.</p>
<p>ST-01's major overhaul of 2058 (January to May, 130 days) was the first large-scale mid-life upgrade in Stellaria-class service history: a complete greenhouse module was added to expand food production, the life-support system underwent a comprehensive upgrade, and a second full artificial-gravity ring was installed -- giving ST-01 dual-ring redundancy so that artificial gravity can be maintained for the entire crew even when one ring is under maintenance or at reduced power. Lessons from this overhaul directly influenced the factory-configuration design of the subsequent ST-02 and ST-03.</p>
<p>Because Stellaria missions are long, the maintenance concept emphasizes repairability during flight. Central side modules store EVA equipment, spare parts, tools, and replaceable experiment packages. Cryosleep capsules can reduce short-term consumption during medical events, transfer-window delays, or elevated life-support loads. Carried vehicles can perform external inspection, towing, and close-range rescue.</p>

<h2 id="safety-and-mission-constraints">Safety and mission constraints</h2>
<p>The most important Stellaria-class safety constraints involve the Lightspeed engine plume, reactor power, long-cycle life support, and externally berthed vehicles. The main engine may not be used in atmosphere, near crewed spacecraft, or in uncleared orbital construction zones. Standard mode is used for cruise far from bodies; high-thrust mode is used for near-body maneuvers, but both require strict plume-clearance and attitude-lock procedures.</p>
<p>Ferry-shuttle operations are also tightly controlled. Echo or other ferry shuttles must complete propellant, thermal-control, communications, and docking-interface checks before departing the mothership. For return, the mothership must provide a stable attitude, docking window, and emergency capture plan. Gas-giant missions must account for radiation belts, complex moon orbits, communications delay, and overlapping target windows.</p>
<p>Long-duration life-support risk is controlled through layered redundancy: greenhouse food and gas cycling, closed-loop air and water processing, main storage and central-expansion consumables, and cryosleep capacity for long waiting periods. If the main reactor cannot drive the engine, backup reactors can still sustain survival loads, attitude control, and communications while rescue or low-energy return options are evaluated.</p>

<h2 id="specifications">Specifications</h2>
<table>
<thead><tr><th>Parameter</th><th>Value</th></tr></thead>
<tbody>
<tr><td>Type</td><td>Large crewed interplanetary exploration mothership</td></tr>
<tr><td>Configuration</td><td>Axial-spine layout with central expansion section and dual artificial-gravity rings</td></tr>
<tr><td>Length</td><td>107.5 m</td></tr>
<tr><td>Maximum diameter</td><td>25 m at the artificial-gravity rings</td></tr>
<tr><td>Propulsion</td><td>Lightspeed mass-driver engine</td></tr>
<tr><td>Main reactor</td><td>Ark cold-fusion reactor, about 80 TW output class</td></tr>
<tr><td>Thrust</td><td>4800 kN standard mode; 7200 kN high-thrust mode</td></tr>
<tr><td>Specific impulse</td><td>3,000,000 s standard mode; 1,500,000 s high-thrust mode</td></tr>
<tr><td>Standard delta-v</td><td>About 3500 km/s with 500 t payload</td></tr>
<tr><td>Early high-delta-v configuration</td><td>About 4500 km/s for ST-01/02 with 300 t payload</td></tr>
<tr><td>Reaction mass</td><td>117.8 t standard configuration; 196.3 t ST-01/02 early high-delta-v configuration</td></tr>
<tr><td>Dry mass</td><td>About 537 t</td></tr>
<tr><td>Maximum mass</td><td>About 1037 t with 500 t payload</td></tr>
<tr><td>Long-duration crew</td><td>30</td></tr>
<tr><td>Short-duration crew</td><td>60</td></tr>
<tr><td>Cryosleep capsules</td><td>40</td></tr>
<tr><td>Greenhouse support</td><td>30 crew long-duration mission, designed for decade-class endurance</td></tr>
<tr><td>Towing capacity</td><td>About 300 t at the forward port; about 100 t class at lateral ports</td></tr>
<tr><td>Carried vehicles</td><td>Typically two Echo shuttles, or an Echo plus Amalthea-type compatible vehicle mix</td></tr>
</tbody></table>

<h2 id="fleet-status">Fleet status</h2>
<table>
<thead><tr><th>Ship</th><th>Construction</th><th>Status</th><th>Current mission</th></tr></thead>
<tbody>
<tr><td>ST-01 Stellaria</td><td>2050-09 to 2054-04 (incl. suspension and reconfiguration)</td><td>In service</td><td>Outer Solar System exploration mission 1 (to Neptune, departed 2060-02-11)</td></tr>
<tr><td>ST-02 Stellaria NEXT</td><td>~2050-09 to 2055-10</td><td>In service</td><td>Europa Outpost crew rotation and Venus exploration support</td></tr>
<tr><td>ST-03</td><td>2058-03 to 2059-03</td><td>In service</td><td>Post-Mars mission maintenance (maiden flight 2059-08)</td></tr>
<tr><td>ST-04</td><td>From 2059-07</td><td>Under construction</td><td>Assembly expected to complete 2063-01</td></tr>
</tbody></table>
<p>ST-03's status has been corrected from "planned" to "in service" -- the ship already flew its first Mars mission in 2059-08. Stellaria-class production continues with ST-04 under construction in the orbital shipyard, with assembly completion expected around January 2063. ST-01 and ST-02 are early high-delta-v configuration ships, optimized for fast deep-space exploration and outer-planet mission validation. ST-03 and subsequent standard ships emphasize larger central volume, higher payload capacity, longer life-support endurance, and greater mission redundancy. Both configurations belong to the same Stellaria-class lineage, differing primarily in mission emphasis, payload allocation, and long-duration habitation capability.</p>

<h3 id="jinwu-class-cargo-ship">Jinwu-class cargo ship</h3>
<table>
<thead><tr><th>Ship</th><th>Identifier</th><th>Construction</th><th>Status</th><th>Current mission</th></tr></thead>
<tbody>
<tr><td>Jinwu</td><td>JW-01</td><td>Started 2058-09</td><td>In service (commissioned 2059-09)</td><td>Europa Outpost expansion mission (2060-03)</td></tr>
<tr><td>&mdash;</td><td>JW-02</td><td>Started 2059-01</td><td>In service (commissioned 2059-12)</td><td>Mars One Base phase-3 expansion cargo transport</td></tr>
<tr><td>&mdash;</td><td>JW-03</td><td>Started 2059-09</td><td>Under construction</td><td>Expected to support long-duration Saturn system survey logistics</td></tr>
</tbody></table>
<p>The <b>Jinwu-class cargo ship</b> is a heavy Solar System cargo transport system operating alongside Stellaria-class motherships. Designed specifically for the construction and resupply of large off-world facilities throughout the Solar System, the class has a single-trip capacity exceeding 300 tonnes. Its propulsion system employs high-efficiency ion/plasma drives optimized for interplanetary cargo routes, enabling regular cargo flights to Mars, the Jovian system, and beyond with relatively low propellant consumption. The Jinwu class operates in coordination with Qingtian (Optimus) cargo vehicles: Qingtian handles medium-to-heavy transfers from low Earth orbit to Star Port Station, while Jinwu covers long-distance bulk cargo transport from Star Port to target systems, together supporting the construction and expansion of Mars One Base and Europa Research Outpost. JW-01 completed commissioning in 2059-09 and entered service, having already conducted multiple Mars and Jovian system cargo missions. JW-02 completed commissioning in 2059-12 and is currently supporting ST-02's Europa Outpost expansion cargo deliveries. JW-03 is currently under construction and, once completed, will further extend the deep-space cargo network's coverage, providing logistics support for future Saturn and Uranus missions.</p>

<h2 id="see-also">See also</h2>
<ul>
<li><a href="/home/Exploration_Motherships/Xihe">Xihe-class interplanetary exploration mothership</a></li>
<li><a href="/home/Exploration_Motherships/Xihe/XH-01">Xihe (XH-01)</a></li>
<li><a href="/home/Space_Shuttles/Echo_Shuttle">Echo Shuttle</a></li>
<li><a href="/home/Space_Shuttles/Enterprise_Shuttle">Enterprise Shuttle</a></li>
<li><a href="/home/Vehicles/Amalthea">Amalthea multipurpose vehicle</a></li>
<li><a href="/home/Cargo_Ships/Qingtian">Qingtian cargo vehicle</a></li>
<li><a href="/home/Cargo_Ships/Jinwu">Jinwu-class cargo ship</a></li>
<li><a href="/home/Stations/Star_Port_Station">Star Port Station</a></li>
<li><a href="/home/Engines/Lightspeed_Engine">Lightspeed engine</a></li>
<li><a href="/home/Bases/Mars_One">Mars One Base</a></li>
<li><a href="/home/Bases/Europa_Research_Outpost">Europa Research Outpost</a></li>
</ul>
</article>