{
  "system_id": "GJ 877",
  "proper_name": "Holmgren's Passage",
  "star_type": "K",
  "spectral_class": "K",
  "wiki_data": {
    "habitable_count": 2,
    "inhabited_count": 2,
    "has_gas_giant": true,
    "has_asteroid_belt": true,
    "has_horizon_station": true,
    "raw_bodies_line": null
  },
  "bodies": [
    {
      "body_id": "GJ877b",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 1,
      "parent_body_id": null,
      "inhabited": false,
      "population": 0,
      "mass_class": "terrestrial",
      "surface_gravity": 0.35,
      "orbital_period_days": 25,
      "rotation_period_hours": 600,
      "atmosphere": "none",
      "biome_summary": "barren",
      "hydrosphere": "none",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "inner rocky, tidally locked"
    },
    {
      "body_id": "GJ877c",
      "proper_name": "Sundsvall",
      "body_type": "planet",
      "orbit_index": 2,
      "parent_body_id": null,
      "inhabited": true,
      "population": 250000000,
      "mass_class": "terrestrial",
      "surface_gravity": 0.88,
      "orbital_period_days": 80,
      "rotation_period_hours": 22.0,
      "atmosphere": "breathable",
      "biome_summary": "temperate-cool",
      "hydrosphere": "moderate",
      "economic_role": "transit",
      "settlement_pattern": "urban",
      "industrial_corridor": null,
      "notes": "primary inhabited world, marginal but workable, Wave 2 Swedish-heritage colony, 400 years continuous occupation, agriculture, manufacturing, institutional services, Holmgren Transit Authority, Assembly liaison office, parliamentary governance"
    },
    {
      "body_id": "GJ877c-1",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 1,
      "parent_body_id": "GJ877c",
      "inhabited": false,
      "population": 0,
      "mass_class": "dwarf",
      "surface_gravity": 0.05,
      "orbital_period_days": 8,
      "rotation_period_hours": 192,
      "atmosphere": "none",
      "biome_summary": "barren",
      "hydrosphere": "none",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "small moon"
    },
    {
      "body_id": "GJ877d",
      "proper_name": "H\u00e4rn\u00f6sand",
      "body_type": "planet",
      "orbit_index": 3,
      "parent_body_id": null,
      "inhabited": true,
      "population": 12000000,
      "mass_class": "terrestrial",
      "surface_gravity": 0.72,
      "orbital_period_days": 180,
      "rotation_period_hours": 20.0,
      "atmosphere": "breathable",
      "biome_summary": "arid",
      "hydrosphere": "minimal",
      "economic_role": "agriculture",
      "settlement_pattern": "dispersed",
      "industrial_corridor": null,
      "notes": "secondary inhabited world, marginal conditions, agricultural expansion settlement, outer habitable zone"
    },
    {
      "body_id": "GJ877e",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 4,
      "parent_body_id": null,
      "inhabited": false,
      "population": 0,
      "mass_class": "terrestrial",
      "surface_gravity": 0.4,
      "orbital_period_days": 400,
      "rotation_period_hours": 18.0,
      "atmosphere": "thin",
      "biome_summary": "frozen",
      "hydrosphere": "ice",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "cold rocky"
    },
    {
      "body_id": "GJ877f",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 5,
      "parent_body_id": null,
      "inhabited": false,
      "population": 0,
      "mass_class": "terrestrial",
      "surface_gravity": 0.32,
      "orbital_period_days": 900,
      "rotation_period_hours": 16.0,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": "ice",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "frozen rocky"
    },
    {
      "body_id": "GJ877g",
      "proper_name": null,
      "body_type": "gas_giant",
      "orbit_index": 6,
      "parent_body_id": null,
      "inhabited": false,
      "population": 0,
      "mass_class": "gas_giant",
      "surface_gravity": null,
      "orbital_period_days": 2500,
      "rotation_period_hours": 11.0,
      "atmosphere": "dense",
      "biome_summary": null,
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "moderate gas giant"
    },
    {
      "body_id": "GJ877g-1",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 1,
      "parent_body_id": "GJ877g",
      "inhabited": false,
      "population": 0,
      "mass_class": "dwarf",
      "surface_gravity": 0.06,
      "orbital_period_days": 5,
      "rotation_period_hours": 120,
      "atmosphere": "none",
      "biome_summary": "barren",
      "hydrosphere": "none",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "inner gas giant moon"
    },
    {
      "body_id": "GJ877g-2",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 2,
      "parent_body_id": "GJ877g",
      "inhabited": false,
      "population": 0,
      "mass_class": "dwarf",
      "surface_gravity": 0.04,
      "orbital_period_days": 14,
      "rotation_period_hours": 336,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": "ice",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "icy outer gas giant moon"
    },
    {
      "body_id": "GJ877h",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 7,
      "parent_body_id": null,
      "inhabited": false,
      "population": 0,
      "mass_class": "terrestrial",
      "surface_gravity": 0.22,
      "orbital_period_days": 5500,
      "rotation_period_hours": 20.0,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": "ice",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer ice world"
    },
    {
      "body_id": "GJ877i",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 8,
      "parent_body_id": null,
      "inhabited": false,
      "population": 0,
      "mass_class": "dwarf",
      "surface_gravity": 0.11,
      "orbital_period_days": 10000,
      "rotation_period_hours": 22.0,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": "ice",
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "distant ice dwarf"
    },
    {
      "body_id": "GJ877-belt",
      "proper_name": null,
      "body_type": "asteroid_belt",
      "orbit_index": 9,
      "parent_body_id": null,
      "inhabited": false,
      "population": 0,
      "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": "outer belt"
    },
    {
      "body_id": "GJ877-oort",
      "proper_name": null,
      "body_type": "oort_cloud",
      "orbit_index": 10,
      "parent_body_id": null,
      "inhabited": false,
      "population": 0,
      "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": "GJ877c-S1",
      "proper_name": "Vadstena",
      "orbits_body_id": "GJ877c",
      "station_type": "commercial",
      "population": 15000000,
      "economic_role": "transit",
      "docking_class": "major",
      "has_gate_infrastructure": false,
      "notes": "Holmgren Transit Authority, 400-year transit archive, Assembly regional liaison office (15-year tenure), through-route transit services, institutional services hub for outer reach"
    },
    {
      "station_id": "GJ877-oort-S1",
      "proper_name": "Arjeplog",
      "orbits_body_id": "GJ877-oort",
      "station_type": "horizon",
      "population": 1500,
      "economic_role": "transit",
      "docking_class": "major",
      "has_gate_infrastructure": true,
      "notes": "horizon station, 2 apertures, through-route transit toward GJ 880 and Okoro's Claim"
    }
  ]
}