{
  "system_id": "GJ 807",
  "proper_name": "Grenzstein",
  "star_type": "K",
  "spectral_class": "K0IV",
  "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": "GJ807b",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 1,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.71,
      "orbital_period_days": 130.0,
      "rotation_period_hours": 3120.0,
      "atmosphere": "none",
      "biome_summary": "barren",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "inner rocky; tidally locked at 130-day period × 24 = 3120h rotation; hot dayside, extreme temperatures; no atmosphere; expanded K0IV illumination radius means this planet is in a wider inner orbit than comparable main-sequence systems"
    },
    {
      "body_id": "GJ807c",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 2,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.66,
      "orbital_period_days": 295.0,
      "rotation_period_hours": 22.4,
      "atmosphere": "thick",
      "biome_summary": "arid",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "dry rocky world in inner-warm range; dense CO2 atmosphere; runaway greenhouse conditions; no settlement possible; surveyed early in Grenzstein founding period"
    },
    {
      "body_id": "GJ807d",
      "proper_name": "Pierrevert",
      "body_type": "planet",
      "orbit_index": 3,
      "parent_body_id": null,
      "inhabited": true,
      "population": 8000,
      "mass_class": "terrestrial",
      "surface_gravity": 0.91,
      "orbital_period_days": 620.0,
      "rotation_period_hours": 27.6,
      "atmosphere": "breathable",
      "biome_summary": "temperate-cool",
      "hydrosphere": "rivers-lakes",
      "economic_role": "agricultural",
      "settlement_pattern": "concentrated",
      "industrial_corridor": "west_reach",
      "notes": "primary inhabited world; K0IV subgiant outer habitable zone — warm but not intense illumination; slightly reddish stellar light produces vegetation with adapted photosynthetic systems, darker foliage; cooler seasonal cycle than Bout du Chemin; weather patterns require learning; two continents — primary settlement concentrated in temperate plains of main continent; secondary continent highlands contain surveyed geological anomalies (structured surface features found year 3, noted as inconsistent with natural formation, not followed up; second survey year 6 found features absent — both reports in coordinating council files, not forwarded); Wave 5 settlement ~40 years old, started with <2,000, now ~8,000 permanent residents; French-speaking, Bout du Chemin-heritage culture in early identity formation; heavy dependency on Bout du Chemin imports; exports minimal (agricultural raw product, early extraction material)"
    },
    {
      "body_id": "GJ807d-1",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 1,
      "parent_body_id": "GJ807d",
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.07,
      "orbital_period_days": 24.8,
      "rotation_period_hours": 595.2,
      "atmosphere": "none",
      "biome_summary": "barren",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "Pierrevert's moon; tidally locked; prominent in early settlement sky observations and community calendar-making"
    },
    {
      "body_id": "GJ807-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": "moderate main belt; surveyed in founding period; some early extraction work; no established operations — settlement-phase priorities precluded investment"
    },
    {
      "body_id": "GJ807e",
      "proper_name": null,
      "body_type": "gas_giant",
      "orbit_index": 5,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "gas_giant",
      "surface_gravity": 2.6,
      "orbital_period_days": 3500.0,
      "rotation_period_hours": 9.8,
      "atmosphere": "hydrogen-helium",
      "biome_summary": null,
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer gas giant; muted ochre-grey banding; no extraction operations; outer system survey planned but not yet conducted"
    },
    {
      "body_id": "GJ807e-1",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 1,
      "parent_body_id": "GJ807e",
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.10,
      "orbital_period_days": 14.4,
      "rotation_period_hours": 345.6,
      "atmosphere": "none",
      "biome_summary": "barren",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "inner gas giant moon; unsurveyed"
    },
    {
      "body_id": "GJ807e-2",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 2,
      "parent_body_id": "GJ807e",
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.07,
      "orbital_period_days": 31.6,
      "rotation_period_hours": 758.4,
      "atmosphere": "none",
      "biome_summary": "ice",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer gas giant moon; icy; unsurveyed"
    },
    {
      "body_id": "GJ807f",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 6,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.46,
      "orbital_period_days": 9200.0,
      "rotation_period_hours": 19.4,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer ice-rock world; unsurveyed in 40-year settlement period"
    },
    {
      "body_id": "GJ807g",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 7,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.08,
      "orbital_period_days": 22000.0,
      "rotation_period_hours": 15.2,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer ice dwarf; trans-neptunian analog; entirely unsurveyed"
    },
    {
      "body_id": "GJ807h",
      "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": 48000.0,
      "rotation_period_hours": 12.6,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "distant ice dwarf; scattered disk; entirely unsurveyed"
    },
    {
      "body_id": "GJ807i",
      "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": 92000.0,
      "rotation_period_hours": 11.0,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "extreme outer ice dwarf; detached scattered disk; unknown until outer system survey"
    },
    {
      "body_id": "GJ807-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": "GJ807-oort-S1",
      "proper_name": "Grenzstein Horizon",
      "orbits_body_id": "GJ807-oort",
      "station_type": "horizon",
      "population": 400,
      "economic_role": "transit",
      "docking_class": "major",
      "has_gate_infrastructure": true,
      "notes": "two-aperture through-route horizon station; operated by small coordinating council caretaker team; connects Bout du Chemin inward and Yttermark outward; minimal permanent infrastructure for a 40-year settlement — functional but not established; community administrative reporting routed through Bout du Chemin's channel (Grenzstein's admin office has two staff, uses Bout du Chemin as proxy for Assembly reporting requirements)"
    }
  ]
}