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settled-reach/docs/atlas/proposals/GJ529.json
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jpmschweitzerandClaude Opus 4.6 13a620a4d1 data(atlas): author GJ 529 (Yttermark) — west_reach 
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-30 12:41:20 +02:00

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{
"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"
}
]
}
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