{
  "system_id": "GJ 231",
  "proper_name": "Thorvaldsen's Circuit",
  "star_type": "G",
  "spectral_class": "G5V",
  "wiki_data": {
    "habitable_count": 1,
    "inhabited_count": 1,
    "has_gas_giant": true,
    "has_asteroid_belt": true,
    "has_horizon_station": true,
    "raw_bodies_line": null
  },
  "bodies": [
    {
      "body_id": "GJ231b",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 1,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.48,
      "orbital_period_days": 42.0,
      "rotation_period_hours": 19.4,
      "atmosphere": "none",
      "biome_summary": "barren",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "inner rocky, hot, uninhabited"
    },
    {
      "body_id": "GJ231c",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 2,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.72,
      "orbital_period_days": 140.0,
      "rotation_period_hours": 24.8,
      "atmosphere": "thin",
      "biome_summary": "hot_arid",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "hot inner rocky, desiccated, uninhabited"
    },
    {
      "body_id": "GJ231d",
      "proper_name": "Britta's Landing",
      "body_type": "planet",
      "orbit_index": 3,
      "parent_body_id": null,
      "inhabited": true,
      "population": 35000000,
      "mass_class": "terrestrial",
      "surface_gravity": 0.92,
      "orbital_period_days": 310.0,
      "rotation_period_hours": 25.6,
      "atmosphere": "standard",
      "biome_summary": "temperate",
      "hydrosphere": "liquid_water",
      "economic_role": "research",
      "settlement_pattern": "urban_concentrated",
      "industrial_corridor": "research_export",
      "notes": "primary inhabited world; wave_2 Danish survey heritage (Maj-Britt Thorvaldsen); 2-aperture loop_member; G5V warm light; two economic reinventions (mining → refinery → education); technical education hub for outer corridor extraction engineering; remnant refinery sector at reduced capacity; three-bloc cooperative council governance; Compact of Westphalia formal member (institutional recognition framework)"
    },
    {
      "body_id": "GJ231-belt",
      "proper_name": null,
      "body_type": "asteroid_belt",
      "orbit_index": 4,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": null,
      "surface_gravity": null,
      "orbital_period_days": null,
      "rotation_period_hours": null,
      "atmosphere": null,
      "biome_summary": null,
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "depleted inner mineral belt; former extraction zone, now exhausted"
    },
    {
      "body_id": "GJ231e",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 5,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.58,
      "orbital_period_days": 920.0,
      "rotation_period_hours": 27.8,
      "atmosphere": "thin",
      "biome_summary": "cold_arid",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer rocky, uninhabited"
    },
    {
      "body_id": "GJ231f",
      "proper_name": null,
      "body_type": "gas_giant",
      "orbit_index": 6,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": null,
      "surface_gravity": null,
      "orbital_period_days": 2800.0,
      "rotation_period_hours": 10.8,
      "atmosphere": "gas_giant",
      "biome_summary": null,
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer gas giant, two moons"
    },
    {
      "body_id": "GJ231f-m1",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 1,
      "parent_body_id": "GJ231f",
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.13,
      "orbital_period_days": 6.4,
      "rotation_period_hours": 153.6,
      "atmosphere": null,
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "icy moon, tidally locked"
    },
    {
      "body_id": "GJ231f-m2",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 2,
      "parent_body_id": "GJ231f",
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.08,
      "orbital_period_days": 13.8,
      "rotation_period_hours": 331.2,
      "atmosphere": null,
      "biome_summary": "barren",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "small rocky moon, tidally locked"
    },
    {
      "body_id": "GJ231g",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 7,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.46,
      "orbital_period_days": 7200.0,
      "rotation_period_hours": 35.4,
      "atmosphere": "trace",
      "biome_summary": "frozen",
      "hydrosphere": "ice",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer icy rocky, uninhabited"
    },
    {
      "body_id": "GJ231h",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 8,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.36,
      "orbital_period_days": 15800.0,
      "rotation_period_hours": 43.6,
      "atmosphere": "trace",
      "biome_summary": "frozen",
      "hydrosphere": "ice",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "distant icy rocky, uninhabited"
    },
    {
      "body_id": "GJ231i",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 9,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.12,
      "orbital_period_days": 34000.0,
      "rotation_period_hours": 30.2,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": "ice",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outermost dwarf, near oort boundary"
    },
    {
      "body_id": "GJ231j",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 10,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.10,
      "orbital_period_days": 62000.0,
      "rotation_period_hours": 23.8,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": "ice",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "distant ice dwarf"
    },
    {
      "body_id": "GJ231-oort",
      "proper_name": null,
      "body_type": "oort_cloud",
      "orbit_index": 11,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": null,
      "surface_gravity": null,
      "orbital_period_days": null,
      "rotation_period_hours": null,
      "atmosphere": null,
      "biome_summary": null,
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "oort cloud"
    }
  ],
  "stations": [
    {
      "station_id": "GJ231-oort-S1",
      "proper_name": "Thorvaldsen's Circuit Horizon",
      "orbits_body_id": "GJ231-oort",
      "station_type": "horizon",
      "population": 580,
      "economic_role": "transit",
      "docking_class": "major",
      "has_gate_infrastructure": true,
      "notes": "horizon station — 2 apertures; loop_member; connects Rødvik and Kopparhytta"
    },
    {
      "station_id": "GJ231d-S1",
      "proper_name": "Højskolen",
      "orbits_body_id": "GJ231d",
      "station_type": "research",
      "population": 4800,
      "economic_role": "research",
      "docking_class": "standard",
      "has_gate_infrastructure": false,
      "notes": "technical education institution; deep extraction engineering curriculum; outer corridor student enrollment; Compact institutional recognition (not Assembly accredited)"
    },
    {
      "station_id": "GJ231d-S2",
      "proper_name": "Smelteriet",
      "orbits_body_id": "GJ231d",
      "station_type": "industrial",
      "population": 2400,
      "economic_role": "manufacturing",
      "docking_class": "major",
      "has_gate_infrastructure": false,
      "notes": "remnant heavy ore refinery; reduced capacity; aging processing units nearing end-of-certified-life; imports raw ore from Kopparhytta"
    }
  ]
}