{
  "system_id": "GJ 529",
  "proper_name": "Yttermark",
  "star_type": "K",
  "spectral_class": "K4/K5V",
  "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": "GJ529b",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 1,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.58,
      "orbital_period_days": 48.0,
      "rotation_period_hours": 1152.0,
      "atmosphere": "none",
      "biome_summary": "barren",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "inner rocky circumbinary planet; tidally influenced by combined binary gravity at 48-day period × 24 = 1152h rotation; heavily cratered; binary star system's inner stability limit wider than single-star systems"
    },
    {
      "body_id": "GJ529c",
      "proper_name": "Midtmark",
      "body_type": "planet",
      "orbit_index": 2,
      "parent_body_id": null,
      "inhabited": true,
      "population": 35000,
      "mass_class": "terrestrial",
      "surface_gravity": 0.87,
      "orbital_period_days": 140.0,
      "rotation_period_hours": 25.8,
      "atmosphere": "breathable",
      "biome_summary": "temperate-cool",
      "hydrosphere": "rivers-lakes",
      "economic_role": "agricultural",
      "settlement_pattern": "concentrated",
      "industrial_corridor": "west_reach",
      "notes": "primary inhabited world; circumbinary orbit around close K4/K5V pair; combined stellar illumination produces variable light patterns as stars orbit their common center — vegetation shows adapted photosynthetic systems, agricultural cycles calibrated to binary orbital phase over generation of observation; workable rather than comfortable ecology; Wave 3 settlement ~300 years; dead_end system — one gate, one supply connection (4 consolidated freight runs/year from Grenzstein); oldest continuously operating independent government in west_reach beyond Compact zone; founding council structure preserved three centuries; population in slow outward trickle (young adults leave on supply ships); self-sufficient by necessity, not surplus; annual supply schedule from GJ 807 is lifeline infrastructure"
    },
    {
      "body_id": "GJ529c-1",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 1,
      "parent_body_id": "GJ529c",
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.06,
      "orbital_period_days": 19.8,
      "rotation_period_hours": 475.2,
      "atmosphere": "none",
      "biome_summary": "barren",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "Midtmark's moon; tidally locked; used in community agricultural calendar as secondary cycle reference alongside binary star orbital phase"
    },
    {
      "body_id": "GJ529d",
      "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": 350.0,
      "rotation_period_hours": 21.0,
      "atmosphere": "thin",
      "biome_summary": "arid",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "dry rocky outer-warm world; thin CO2 atmosphere; polar ice; surveyed in first two decades of settlement; no viable resource extraction"
    },
    {
      "body_id": "GJ529-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; binary perturbation has distributed belt density unevenly; some early survey work; no active extraction — community priorities focused on agricultural sufficiency"
    },
    {
      "body_id": "GJ529e",
      "proper_name": null,
      "body_type": "gas_giant",
      "orbit_index": 5,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "gas_giant",
      "surface_gravity": 1.9,
      "orbital_period_days": 1700.0,
      "rotation_period_hours": 12.6,
      "atmosphere": "hydrogen-helium",
      "biome_summary": null,
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "mid-system gas giant; deep orange banding from cool K-star illumination; no active extraction; surveyed but not operationally relevant to current settlement needs"
    },
    {
      "body_id": "GJ529e-1",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 1,
      "parent_body_id": "GJ529e",
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.07,
      "orbital_period_days": 11.4,
      "rotation_period_hours": 273.6,
      "atmosphere": "none",
      "biome_summary": "barren",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "inner gas giant moon; dark surface"
    },
    {
      "body_id": "GJ529e-2",
      "proper_name": null,
      "body_type": "moon",
      "orbit_index": 2,
      "parent_body_id": "GJ529e",
      "inhabited": false,
      "population": null,
      "mass_class": "dwarf",
      "surface_gravity": 0.06,
      "orbital_period_days": 24.6,
      "rotation_period_hours": 590.4,
      "atmosphere": "none",
      "biome_summary": "ice",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer gas giant moon; icy; unsurveyed beyond initial scan"
    },
    {
      "body_id": "GJ529f",
      "proper_name": null,
      "body_type": "planet",
      "orbit_index": 6,
      "parent_body_id": null,
      "inhabited": false,
      "population": null,
      "mass_class": "terrestrial",
      "surface_gravity": 0.43,
      "orbital_period_days": 5200.0,
      "rotation_period_hours": 18.0,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer ice-rock world; methane frost; entirely unsurveyed"
    },
    {
      "body_id": "GJ529g",
      "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": 12500.0,
      "rotation_period_hours": 14.6,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "outer ice dwarf; trans-neptunian analog; unknown beyond detection"
    },
    {
      "body_id": "GJ529h",
      "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": 28000.0,
      "rotation_period_hours": 12.0,
      "atmosphere": "none",
      "biome_summary": "frozen",
      "hydrosphere": null,
      "economic_role": null,
      "settlement_pattern": null,
      "industrial_corridor": null,
      "notes": "distant outer ice dwarf; entirely unmapped"
    },
    {
      "body_id": "GJ529i",
      "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": 56000.0,
      "rotation_period_hours": 10.4,
      "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; outer system entirely unknown to settlement"
    },
    {
      "body_id": "GJ529-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; single aperture — dead_end; last gate in the Settled Reach"
    }
  ],
  "stations": [
    {
      "station_id": "GJ529-oort-S1",
      "proper_name": "Yttermark Horizon",
      "orbits_body_id": "GJ529-oort",
      "station_type": "horizon",
      "population": 350,
      "economic_role": "transit",
      "docking_class": "major",
      "has_gate_infrastructure": true,
      "notes": "single-aperture dead_end horizon station; last gate in the Settled Reach; Gate Corporation maintains aperture under long-standing service contract (longer maintenance cycle than anywhere else in the Reach due to distance); Gate Corp maintenance teams are made welcome and well-fed — community treats them as guests and asks careful questions about events in the rest of the corridor; small permanent caretaker crew; the community's annual supply ships from GJ 807 dock here; connects inward to Grenzstein — the only gate this system has"
    }
  ]
}