Asterra Star System

Asterra Star System

• • Primary Star: Asterra
  • Stellar Type: G-type main sequence (cool yellow)
  • Mass: 0.93 Sol
  • Luminosity: 0.78 Sol
  • Radius: 0.95 Sol
  • Estimated Age: ~7.1 billion years
  • Stellar Activity: Low flare rate
  • Habitable Zone: 0.62–0.74 AU

The Asterra star system is dynamically stable and long-settled.

Most permanent infrastructure predates the loss of Ytharia and was designed for extended autonomous operation.

System Scale

• Inner system boundary: ~0.1 AU
• Primary asteroid belts: 2.4 AU and 6.8 AU
• Outer planetary boundary (Helior): ~38 AU
• Effective heliopause influence: ~95 AU

Traffic followed fixed corridors enforced by orbital control infrastructure.

Planetary Order

1. Keth

• • Type: Rocky (terrestrial)
  • Orbital Radius: 0.21 AU
  • Orbital Period: 41 standard days
  • Rotation: Tidally locked
  • Mass: 0.62 Earth
  • Surface Gravity: 0.78 g
  • Atmosphere: ~0.2 bar, volatile-poor
  • Mean Dayside Temperature: ~620 K
  • Mean Nightside Temperature: ~190 K
  • Moons: None

Keth exhibits permanent hemispheric contrast.

The dayside is exposed to continuous stellar radiation.

The nightside remains cold and shielded.

Keth Mining Operations

Mining activity was restricted to the nightside.

• Operational depth: 300–1200 m
• Facilities: Subsurface, hardened
• Automation level: High
• Permanent staffing (peak): <400 system-wide
• Power: Orbital solar collectors and compact reactors

Keth was never intended for habitation and functioned solely as an inner-system industrial node.

2. Ytharia

• • Type: Rocky (ocean-dominated terrestrial)
  • Orbital Radius: 0.68 AU
  • Orbital Period: 286 standard days
  • Axial Tilt: 18.4°
  • Mass: 1.08 Earth
  • Surface Gravity: 1.02 g
  • Surface Water Coverage: ~72%
  • Mean Surface Temperature: ~284 K
  • Atmosphere: ~1.4 bar, moisture-rich
  • Moons: Two

Ytharia was the only planet in the Asterra system known to support complex native life.

Ytharia Orbital Station

A major orbital station operated in high orbit.

• Orbital altitude: ~42,000 km
• Primary ring diameter: ~11 km
• Permanent population (pre-loss): ~180,000
• Berths: ~10 capital-class vessels

The station functioned as the primary spaceport, customs hub, manufacturing center, and traffic control node for the system.

Moons of Ytharia

Elaris

• • Classification: Major moon
  • Radius: ~1,720 km
  • Mass: 0.94 Luna
  • Orbital Distance: ~410,000 km
  • Orbital Period: 34.6 days

Elaris governed Ytharia’s primary tidal cycles and stabilized axial tilt.

Elaris Lunar Base

• Population capacity: ~25,000
• Launch mass throughput: ~4.2 million tons per year
• Primary functions:

 * Deep-space observation
 * Orbital traffic support
 * System monitoring

Low seismic activity enabled long-duration operations and sensitive instrumentation.

Tirien

• • Classification: Minor moon
  • Radius: ~720 km
  • Orbital Distance: ~610,000 km
  • Orbital Period: 69.2 days
  • Orbital Resonance: 2:1 with Elaris
  • Inclination: 3.1°

From Ytharia’s surface, Tirien was frequently occluded by Elaris and visible only during specific alignments.

3. Vael

• • Type: Gas giant
  • Orbital Radius: 3.1 AU
  • Orbital Period: 5.4 years
  • Mass: 1.7 Jupiter
  • Magnetosphere Radius: ~9 million km
  • Moons: 40+ confirmed

Vael’s magnetosphere deflected a significant fraction of cometary and interstellar debris, contributing to inner-system stability.

4. Orthis

• • Type: Gas giant
  • Orbital Radius: 7.6 AU
  • Orbital Period: 20.9 years
  • Mass: 1.2 Jupiter
  • Ring Radius: ~140,000 km
  • Moons: 30+

Several moons show evidence of subsurface oceans or cryovolcanic activity.

Orthis Orbital Station

• Orbital altitude: ~1.8 million km
• Population (peak): ~95,000
• Annual material throughput: ~120 million tons

The station served as the primary logistical hub for asteroid and moon mining operations in the middle system.

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5. Ceryn

• • Type:** Gas giant
  • Orbital Radius:** 14.2 AU
  • Orbital Period:** 53.6 years
  • Mass:** 0.7 Jupiter
  • Moons:** Irregular and partially captured

Orbital characteristics indicate major disruption approximately 1.3 billion years ago.

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6. Helior

• • Type:** Gas giant
  • Orbital Radius:** 38 AU
  • Orbital Period:** ~235 years
  • Mass:** 0.4 Jupiter
  • Moons:** Sparse, frozen satellites

Helior marks the outer boundary of significant planetary mass in the system.

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7. Nysa

• • Type:** Rocky (cold terrestrial)
  • Orbital Radius:** 62 AU
  • Orbital Period:** ~490 years
  • Mass:** 0.31 Earth
  • Surface Gravity:** 0.55 g
  • Atmosphere:** <0.1 bar, frozen trace gases
  • Mean Surface Temperature:** ~95 K
  • Moons:** None

The lack of satellites is attributed to early orbital instability and gravitational interference from outer gas giants.

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Infrastructure Summary

• Fixed installations designed for 200–400 year service lifespans
• Automation rates exceeded 80% beyond 3 AU
• Traffic density decreased sharply past Orthis

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Canon Status

The Asterra system is no longer governed as a unified political entity. Persistent infrastructure remains active where power, supply, and personnel allow. Ytharia remains the system’s historical and cultural origin point.

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If you want, next we can:

• Lock **population numbers**
• Define **military assets by orbit**
• Write **The Loss of Ytharia** with dates and hard consequences
• Create **internal wiki templates** so future pages stay consistent

Just say the word.