Althea
| Type: | A7III White Giant Star |
| Radius: | 3.48 x 109 km |
| Mass: | 3.51 x 1030 kg (180.0% of Sol) |
| Temperature: | 8000 K |
| Luminosity: | 2.79 x 1027 W (7.3x Sol) |
| Ecosphere: | Between 2.58 and 3.72 AU |
| Location: | 22.27 ly from the Promethean Reach Star System Category:Bellatrix Antares Sector |
The Althea system is anchored by a massive A7III white giant star. This stellar arrangement features five distinct planets accompanied by a total of six moons and two sprawling asteroid belts. Notably, the system hosts one world classified as a class O habitable planet. The system was first identified by long-range stellar surveys, but remained largely unmapped until the arrival of the deep-space probe Pathfinder VII in 2142. This automated scout provided the first high-resolution scans of the white giant star and confirmed the presence of the system's five primary planets. In 2158, the specialized atmospheric probe Vayu-9 was deployed to conduct a three-year study of the system's gas and ice giants, successfully mapping the turbulent layers of Aetherius and the complex magnetic field of Boreas.
Detailed cataloging of the system's vast mineral wealth was conducted in 2274 by the SS Isambard, a civilian mining vessel owned by the Heavensgate Extraction Corp. The crew of the Isambard spent fourteen months surveying both the Inner Reach and the Outer Shroud, identifying high concentrations of platinum-group metals and volatile hydrocarbons. Despite the lush, oceanic appearance of Marisara and the resource-rich asteroid belts, subsequent survey missions have confirmed that there is no intelligent life present within the system, nor any signs of past civilization.
The Inner Reach
An asteroid belt orbits roughly between 0.971 AU and 1.761 AU. The Inner Reach is characterized by a high concentration of bright, stony bodies that have undergone significant thermal processing due to their proximity to Althea. These asteroids are rich in magnesium-silicates and iron-silicates, particularly minerals like olivine and pyroxene. Interspersed among the stony debris are the exposed nickel-iron cores of ancient protoplanets. These metallic bodies are prime sources for industrial-grade iron and nickel, as well as high concentrations of platinum-group metals including iridium, palladium, and osmium.
Marisara
| Class: | O |
| Distance: | 3.338 AU |
| Period: | 6 years 37 days 12 hours and 43 minutes |
| Radius: | 8,101.1 km |
| Gravity: | 1.188 g |
Marisara is a class O terrestrial, Earth-like ocean world located within the system's habitable zone. It possesses no orbiting moons. The planet maintains an average surface temperature of 12.2 degrees C under an atmospheric pressure of 96.1 kPa, or approximately 0.95 atmospheres. Its atmosphere is composed primarily of oxygen, nitrogen, and argon, while the planetary composition is dominated by silicon, iron, and magnesium. On the surface is the Hermod Outpost Althea Terminal.
Boreas
| Class: | I |
| Distance: | 3.807 AU |
| Period: | 7 years 158 days 11 hours and 53 minutes |
| Radius: | 39,200.5 km |
| Gravity: | 0.714 g |
Boreas is a massive ice giant characterized by a tilted magnetic field and a composition of rock, ice, methane, and ammonia. The planet is orbited by a collection of six moons. Internally, Boreas exhibits average conditions of 5552.7 kPa (54.8 atmospheres) and a temperature of 63.7 degrees C. Its atmospheric structure is such that the pressure decreases by a third to a half for every 100.2 km measured outward from the core.
Aeolus
| Class: | C |
| Distance: | 1.45433 x 107 km |
| Period: | 11 days 1 hour and 42 minutes |
| Radius: | 2,413.31 km |
| Gravity: | 0.283 g |
Aeolus is a class C dead world with no atmosphere. The surface is composed of anthracite, basalt, and hydrocarbons, maintaining a frigid average temperature of -50.4 degrees C.
Zephyrus
| Class: | C |
| Distance: | 4.67611 x 107 km |
| Period: | 63 days 19 hours and 54 minutes |
| Radius: | 1,129.42 km |
| Gravity: | 0.133 g |
Zephyrus is a class C dead world that lacks any atmosphere. Its surface, consisting of anthracite, basalt, and hydrocarbons, reaches an average temperature of -60.6 degrees C.
Notus
| Class: | C |
| Distance: | 5.43405 x 107 km |
| Period: | 79 days 23 hours and 4 minutes |
| Radius: | 6,556.7 km |
| Gravity: | 0.744 g |
Notus is a class C dead world without an atmosphere. The surface is characterized by deposits of anthracite, basalt, and hydrocarbons, with an average temperature recorded at -55.3 degrees C.
Eurus
| Class: | C |
| Distance: | 6.16450 x 107 km |
| Period: | 96 days 14 hours and 44 minutes |
| Radius: | 7,667.52 km |
| Gravity: | 1.057 g |
Eurus is a class C dead world featuring no atmosphere. Its surface environment averages -53.0 degrees C and is composed of anthracite, basalt, and hydrocarbons.
Aura
| Class: | C |
| Distance: | 6.98786 x 107 km |
| Period: | 116 days 14 hours and 28 minutes |
| Radius: | 1,404.87 km |
| Gravity: | 0.163 g |
Aura is a class C dead world entirely devoid of an atmosphere. The surface materials include anthracite, basalt, and hydrocarbons, and the average surface temperature is -51.4 degrees C.
Circius
| Class: | C |
| Distance: | 7.05666 x 107 km |
| Period: | 118 days 7 hours and 54 minutes |
| Radius: | 6,488.35 km |
| Gravity: | 0.908 g |
Circius is a class C dead world with no atmosphere. Its surface is primarily anthracite, basalt, and hydrocarbons, maintaining an average temperature of -52.4 degrees C.
Aetherius
| Class: | J |
| Distance: | 4.474 AU |
| Period: | 9 years 171 days 9 hours and 33 minutes |
| Radius: | 1.75 x 105 km |
| Gravity: | 0.508 g |
Aetherius is a class J gas giant distinguished by a turbulent atmosphere and a prominent ring system. It has no moons. The internal environment of the planet averages 316.7 kPa (3.1 atmospheres) and 36.6 degrees C, with the atmospheric pressure dropping by a third to a half for every 102.9 km from the core. The planet is composed mainly of hydrogen and helium.
Cimmeria
| Class: | C |
| Distance: | 6.579 AU |
| Period: | 16 years 323 days 15 hours and 24 minutes |
| Radius: | 1,139.63 km |
| Gravity: | 0.151 g |
Cimmeria is a class C dead world with no atmosphere and no orbiting moons. The surface is composed of anthracite, basalt, and hydrocarbons, with an average temperature of -103.5 degrees C.
Erebus
| Class: | C |
| Distance: | 8.128 AU |
| Period: | 23 years 68 days 2 hours and 19 minutes |
| Radius: | 2,638.81 km |
| Gravity: | 0.376 g |
Erebus is a class C dead world that lacks both moons and an atmosphere. Its surface environment is made up of anthracite, basalt, and hydrocarbons, with temperatures averaging a cold -118.8 degrees C.
The Outer Shroud
An asteroid belt orbits roughly between 8.459 AU and 14.328 AU. Stretching across the cold outer regions of the system, the Outer Shroud is dominated by dark, primitive bodies that preserve the primordial chemistry of the system's formation. These asteroids are composed largely of hydrates, clay minerals, and silicate rocks, but their true value lies in their abundance of volatile compounds and organic carbon. They are rich in water ice, ammonia, and hydrocarbons, making them essential "filling stations" for life-support and fuel. Other rare asteroids can also be found here, containing anhydrous silicates and complex organic-rich crusts that have remained frozen since the system's infancy.