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settled-reach/docs/atlas/proposals/GJ902.json
T
jpmschweitzerandClaude Opus 4.6 de7a5831cb data(atlas): author GJ 902 — south_reach 
K3V dead-end at hop 7. Habitable moon (0.82g from dense iron
core) orbiting gas giant. 8 planets.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-26 10:25:57 +01:00

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{
"system_id": "GJ 902",
"proper_name": "GJ 902",
"star_type": "K",
"spectral_class": "K3V",
"wiki_data": {
"habitable_count": 1,
"inhabited_count": 0,
"has_gas_giant": true,
"has_asteroid_belt": true,
"has_horizon_station": true,
"raw_bodies_line": null
},
"bodies": [
{
"body_id": "GJ902b",
"proper_name": null,
"body_type": "planet",
"orbit_index": 1,
"parent_body_id": null,
"inhabited": false,
"population": null,
"mass_class": "terrestrial",
"surface_gravity": 0.53,
"orbital_period_days": 34.0,
"rotation_period_hours": 23.0,
"atmosphere": "none",
"biome_summary": "barren",
"hydrosphere": null,
"economic_role": null,
"settlement_pattern": null,
"industrial_corridor": null,
"notes": "inner rocky, hot, uninhabited"
},
{
"body_id": "GJ902c",
"proper_name": null,
"body_type": "planet",
"orbit_index": 2,
"parent_body_id": null,
"inhabited": false,
"population": null,
"mass_class": "terrestrial",
"surface_gravity": 0.88,
"orbital_period_days": 195.0,
"rotation_period_hours": 26.0,
"atmosphere": "thin",
"biome_summary": "arid",
"hydrosphere": null,
"economic_role": null,
"settlement_pattern": null,
"industrial_corridor": null,
"notes": "habitable zone rocky, too dry, unsettled"
},
{
"body_id": "GJ902-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": "moderate asteroid belt"
},
{
"body_id": "GJ902d",
"proper_name": null,
"body_type": "planet",
"orbit_index": 4,
"parent_body_id": null,
"inhabited": false,
"population": null,
"mass_class": "terrestrial",
"surface_gravity": 0.64,
"orbital_period_days": 640.0,
"rotation_period_hours": 31.0,
"atmosphere": "thin",
"biome_summary": "cold_arid",
"hydrosphere": null,
"economic_role": null,
"settlement_pattern": null,
"industrial_corridor": null,
"notes": "outer rocky, cold, uninhabited"
},
{
"body_id": "GJ902e",
"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": 2100.0,
"rotation_period_hours": 12.9,
"atmosphere": "gas_giant",
"biome_summary": null,
"hydrosphere": null,
"economic_role": null,
"settlement_pattern": null,
"industrial_corridor": null,
"notes": "outer gas giant, two moons — second moon has marginal habitability"
},
{
"body_id": "GJ902e-m1",
"proper_name": null,
"body_type": "moon",
"orbit_index": 1,
"parent_body_id": "GJ902e",
"inhabited": false,
"population": null,
"mass_class": "dwarf",
"surface_gravity": 0.13,
"orbital_period_days": 9.2,
"rotation_period_hours": 220.8,
"atmosphere": "trace",
"biome_summary": "frozen",
"hydrosphere": null,
"economic_role": null,
"settlement_pattern": null,
"industrial_corridor": null,
"notes": "icy moon, tidally locked"
},
{
"body_id": "GJ902e-m2",
"proper_name": null,
"body_type": "moon",
"orbit_index": 2,
"parent_body_id": "GJ902e",
"inhabited": false,
"population": null,
"mass_class": "terrestrial",
"surface_gravity": 0.82,
"orbital_period_days": 19.8,
"rotation_period_hours": 475.2,
"atmosphere": "thin",
"biome_summary": "cold_arid",
"hydrosphere": "subsurface_ice",
"economic_role": null,
"settlement_pattern": null,
"industrial_corridor": null,
"notes": "notable habitable moon; tidally locked; tidally heated; subsurface ice deposits; iron core (natural magnetic shielding); settlement survey conducted but not yet claimed — three centuries unclaimed"
},
{
"body_id": "GJ902f",
"proper_name": null,
"body_type": "planet",
"orbit_index": 6,
"parent_body_id": null,
"inhabited": false,
"population": null,
"mass_class": "terrestrial",
"surface_gravity": 0.51,
"orbital_period_days": 5200.0,
"rotation_period_hours": 41.0,
"atmosphere": "trace",
"biome_summary": "frozen",
"hydrosphere": null,
"economic_role": null,
"settlement_pattern": null,
"industrial_corridor": null,
"notes": "outer icy rocky, uninhabited"
},
{
"body_id": "GJ902g",
"proper_name": null,
"body_type": "planet",
"orbit_index": 7,
"parent_body_id": null,
"inhabited": false,
"population": null,
"mass_class": "terrestrial",
"surface_gravity": 0.40,
"orbital_period_days": 9800.0,
"rotation_period_hours": 52.0,
"atmosphere": "trace",
"biome_summary": "frozen",
"hydrosphere": null,
"economic_role": null,
"settlement_pattern": null,
"industrial_corridor": null,
"notes": "distant icy rocky, uninhabited"
},
{
"body_id": "GJ902h",
"proper_name": null,
"body_type": "planet",
"orbit_index": 8,
"parent_body_id": null,
"inhabited": false,
"population": null,
"mass_class": "terrestrial",
"surface_gravity": 0.31,
"orbital_period_days": 18000.0,
"rotation_period_hours": 65.0,
"atmosphere": "trace",
"biome_summary": "frozen",
"hydrosphere": null,
"economic_role": null,
"settlement_pattern": null,
"industrial_corridor": null,
"notes": "far outer icy rocky, uninhabited"
},
{
"body_id": "GJ902i",
"proper_name": null,
"body_type": "planet",
"orbit_index": 9,
"parent_body_id": null,
"inhabited": false,
"population": null,
"mass_class": "terrestrial",
"surface_gravity": 0.23,
"orbital_period_days": 32500.0,
"rotation_period_hours": 81.0,
"atmosphere": "trace",
"biome_summary": "frozen",
"hydrosphere": null,
"economic_role": null,
"settlement_pattern": null,
"industrial_corridor": null,
"notes": "extreme outer icy rocky, uninhabited"
},
{
"body_id": "GJ902-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"
}
],
"stations": [
{
"station_id": "GJ902-oort-S1",
"proper_name": "GJ 902 Horizon",
"orbits_body_id": "GJ902-oort",
"station_type": "horizon",
"population": 120,
"economic_role": "transit",
"docking_class": "major",
"has_gate_infrastructure": true,
"notes": "horizon station — 1 aperture; dead_end; unsettled system"
}
]
}
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