{
  "system_id": "GJ 3737",
  "proper_name": "Nyrheim",
  "star_type": "M",
  "spectral_class": "M4",
  "wiki_data": {
    "habitable_count": 0,
    "inhabited_count": 0,
    "has_gas_giant": true,
    "has_asteroid_belt": true,
    "has_horizon_station": true,
    "raw_bodies_line": null
  },
  "bodies": [
    {
      "body_id": "GJ3737b",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 1,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.30,
      "orbital_period_days": 5.2,
      "rotation_period_hours": 124.8,
      "atmosphere": "none",
      "biome_summary": "barren",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "inner scorched rocky, tidally locked"
    },
    {
      "body_id": "GJ3737c",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 2,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.54,
      "orbital_period_days": 16.0,
      "rotation_period_hours": 384.0,
      "atmosphere": "thin",
      "biome_summary": "cold_arid",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "inner rocky, tidally locked, cold marginal — no surface habitability"
    },
    {
      "body_id": "GJ3737-belt",
      "proper_name": null,
      "body_type": "asteroid_belt",
      "orbit_index": 3,
      "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 asteroid belt"
    },
    {
      "body_id": "GJ3737d",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 4,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.44,
      "orbital_period_days": 88.0,
      "rotation_period_hours": 21.6,
      "atmosphere": "trace",
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer rocky, frozen, uninhabited"
    },
    {
      "body_id": "GJ3737e",
      "proper_name": null,
      "body_type": "gas_giant",
      "orbit_index": 5,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": null,
      "surface_gravity": null,
      "orbital_period_days": 360.0,
      "rotation_period_hours": 12.4,
      "atmosphere": "gas_giant",
      "biome_summary": null,
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer gas giant; the Rig orbits here"
    },
    {
      "body_id": "GJ3737e-m1",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 1,
      "parent_body_id": "GJ3737e",
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.10,
      "orbital_period_days": 4.6,
      "rotation_period_hours": 110.4,
      "atmosphere": null,
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "small icy moon, tidally locked"
    },
    {
      "body_id": "GJ3737e-m2",
      "proper_name": "Kvitfjell",
      "body_type": "moon",
      "orbit_index": 2,
      "parent_body_id": "GJ3737e",
      "inhabited": true,
      "population": 2200,
      "mass_class": "terrestrial",
      "surface_gravity": 0.32,
      "orbital_period_days": 11.2,
      "rotation_period_hours": 268.8,
      "atmosphere": "trace",
      "biome_summary": "barren",
      "hydrosphere": null,
      "economic_role": "mining",
      "settlement_pattern": "urban_concentrated",
      "industrial_corridor": "luxury_mineral_export",
      "notes": "marble moon; tidally locked; Norwegian 'white mountain'; large rocky moon with exposed metamorphic geology; high-purity calcite marble with distinctive blue-grey veining from iron-manganese trace minerals unique to this formation; pressurized quarrying settlement with cutting and polishing facility; the Reach's only commercial-grade marble source; demand from inner-corridor architectural and memorial markets consistently exceeds output; the Rig's principles council debates whether marble revenue undermines the cooperative's subsidized manufacturing identity; export priced per kilogram not per tonne — freight economics inverted relative to bulk stone"
    },
    {
      "body_id": "GJ3737f",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 6,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.35,
      "orbital_period_days": 1100.0,
      "rotation_period_hours": 30.4,
      "atmosphere": "trace",
      "biome_summary": "frozen",
      "hydrosphere": "ice",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer icy rocky, uninhabited"
    },
    {
      "body_id": "GJ3737g",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 7,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.11,
      "orbital_period_days": 2800.0,
      "rotation_period_hours": 24.8,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": "ice",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outermost ice dwarf"
    },
    {
      "body_id": "GJ3737h",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 8,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.10,
      "orbital_period_days": 6200.0,
      "rotation_period_hours": 21.4,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": "ice",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "distant ice dwarf"
    },
    {
      "body_id": "GJ3737-oort",
      "proper_name": null,
      "body_type": "oort_cloud",
      "orbit_index": 9,
      "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": "GJ3737-oort-S1",
      "proper_name": "Nyrheim Horizon",
      "orbits_body_id": "GJ3737-oort",
      "station_type": "horizon",
      "population": 420,
      "economic_role": "transit",
      "docking_class": "major",
      "has_gate_infrastructure": true,
      "notes": "horizon station — 2 apertures; loop_member; connects Torsby and Vindkast; transit fee dispute with Gate Corporation (22 years unresolved)"
    },
    {
      "station_id": "GJ3737e-S1",
      "proper_name": "the Rig",
      "orbits_body_id": "GJ3737e",
      "station_type": "commercial",
      "population": 6000,
      "economic_role": "manufacturing",
      "docking_class": "major",
      "has_gate_infrastructure": false,
      "notes": "primary habitation (the Rig); modular expanding station orbiting gas giant; wave_5 founding cooperative; two-chamber governance (practical council + principles council); subsidized light manufacturing sector; Compact of Westphalia founding signatory; construction ongoing"
    }
  ]
}