{
  "system_id": "GJ 42",
  "proper_name": "Langemark",
  "star_type": "K",
  "spectral_class": "K2V",
  "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": "GJ42b",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 1,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.64,
      "orbital_period_days": 52.0,
      "rotation_period_hours": 1248.0,
      "atmosphere": "none",
      "biome_summary": "barren",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "inner rocky; tidally locked at 52-day period × 24 = 1248h rotation; heavily irradiated dayside; no atmosphere"
    },
    {
      "body_id": "GJ42c",
      "proper_name": "Poperinge",
      "body_type": "planet",
      "orbit_index": 2,
      "parent_body_id": null,
      "inhabited": true,
      "population": 55000,
      "mass_class": "terrestrial",
      "surface_gravity": 0.89,
      "orbital_period_days": 200.0,
      "rotation_period_hours": 24.8,
      "atmosphere": "standard",
      "biome_summary": "temperate",
      "hydrosphere": "liquid_water",
      "economic_role": "agricultural",
      "settlement_pattern": "dispersed",
      "industrial_corridor": "agricultural_export",
      "notes": "primary inhabited world; K2V habitable zone; genuine agricultural potential found by founding pastoral cooperative; temperate conditions, good soil, river-valley farmland; Wave 3 settlement ~300 years old; population peaked ~80 years ago and in slow consistent decline as young adults leave for inner-corridor systems offering more economic variety; self-governing council of landholders (reformed ~150 years ago to include non-agricultural members); no Assembly or Compact presence; Gate Corporation maintenance rotation is extent of institutional contact"
    },
    {
      "body_id": "GJ42c-1",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 1,
      "parent_body_id": "GJ42c",
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.07,
      "orbital_period_days": 21.4,
      "rotation_period_hours": 513.6,
      "atmosphere": "none",
      "biome_summary": "barren",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "Poperinge's single moon; tidally locked; used in local calendar reckoning by farming community"
    },
    {
      "body_id": "GJ42d",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 3,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.52,
      "orbital_period_days": 510.0,
      "rotation_period_hours": 21.2,
      "atmosphere": "thin",
      "biome_summary": "arid",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "dry rocky world beyond habitable zone; thin atmosphere; polar ice caps; surveyed early settlement era, no viable resource concentration found"
    },
    {
      "body_id": "GJ42-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": "sparse main belt; early prospectors found insufficient concentration for cooperative extraction economics; no active operations"
    },
    {
      "body_id": "GJ42e",
      "proper_name": null,
      "body_type": "gas_giant",
      "orbit_index": 5,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "gas_giant",
      "surface_gravity": 2.1,
      "orbital_period_days": 2200.0,
      "rotation_period_hours": 11.4,
      "atmosphere": "hydrogen-helium",
      "biome_summary": null,
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "mid-system gas giant; amber-tan banding; no active resource extraction"
    },
    {
      "body_id": "GJ42e-1",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 1,
      "parent_body_id": "GJ42e",
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.08,
      "orbital_period_days": 12.6,
      "rotation_period_hours": 302.4,
      "atmosphere": "none",
      "biome_summary": "barren",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "inner gas giant moon; dark cratered surface"
    },
    {
      "body_id": "GJ42e-2",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 2,
      "parent_body_id": "GJ42e",
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.06,
      "orbital_period_days": 27.8,
      "rotation_period_hours": 667.2,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer gas giant moon; icy surface; subsurface ice confirmed"
    },
    {
      "body_id": "GJ42f",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 6,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.42,
      "orbital_period_days": 5800.0,
      "rotation_period_hours": 18.4,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer ice-rock world; methane frost surface; uninhabited"
    },
    {
      "body_id": "GJ42g",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 7,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.07,
      "orbital_period_days": 14000.0,
      "rotation_period_hours": 14.2,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer ice dwarf; trans-neptunian analog"
    },
    {
      "body_id": "GJ42h",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 8,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.05,
      "orbital_period_days": 31000.0,
      "rotation_period_hours": 11.8,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "distant outer ice dwarf; scattered disk object"
    },
    {
      "body_id": "GJ42i",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 9,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.04,
      "orbital_period_days": 58000.0,
      "rotation_period_hours": 10.2,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "extreme outer ice dwarf; detached scattered-disk object"
    },
    {
      "body_id": "GJ42-oort",
      "proper_name": null,
      "body_type": "oort_cloud",
      "orbit_index": 10,
      "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; gate infrastructure sited here"
    }
  ],
  "stations": [
    {
      "station_id": "GJ42-oort-S1",
      "proper_name": "Langemark Horizon",
      "orbits_body_id": "GJ42-oort",
      "station_type": "horizon",
      "population": 2000,
      "economic_role": "transit",
      "docking_class": "major",
      "has_gate_infrastructure": true,
      "notes": "two-aperture through-route horizon station; maintained under standing 10-year commercial agreement with Gate Corporation; Gate Corp maintenance team rotates every 14 months; modest permanent crew handles transit scheduling and corridor resupply; connects Echternach inbound and Bout du Chemin outbound; deliberate non-growth policy — council views the station as infrastructure, not community expansion"
    }
  ]
}