diff --git a/docs/atlas/proposals/GJ42.json b/docs/atlas/proposals/GJ42.json
new file mode 100644
index 000000000..1c859a13c
--- /dev/null
+++ b/docs/atlas/proposals/GJ42.json
@@ -0,0 +1,289 @@
+{
+  "system_id": "GJ 42",
+  "proper_name": "Langemark",
+  "star_type": "K",
+  "spectral_class": "K2V",
+  "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": "GJ42b",
+      "proper_name": null,
+      "body_type": "planet",
+      "orbit_index": 1,
+      "parent_body_id": null,
+      "inhabited": false,
+      "population": null,
+      "mass_class": "terrestrial",
+      "surface_gravity": 0.64,
+      "orbital_period_days": 52.0,
+      "rotation_period_hours": 1248.0,
+      "atmosphere": "none",
+      "biome_summary": "barren",
+      "hydrosphere": null,
+      "economic_role": null,
+      "settlement_pattern": null,
+      "industrial_corridor": null,
+      "notes": "inner rocky; tidally locked at 52-day period × 24 = 1248h rotation; heavily irradiated dayside; no atmosphere"
+    },
+    {
+      "body_id": "GJ42c",
+      "proper_name": "Poperinge",
+      "body_type": "planet",
+      "orbit_index": 2,
+      "parent_body_id": null,
+      "inhabited": true,
+      "population": 55000,
+      "mass_class": "terrestrial",
+      "surface_gravity": 0.89,
+      "orbital_period_days": 200.0,
+      "rotation_period_hours": 24.8,
+      "atmosphere": "breathable",
+      "biome_summary": "temperate",
+      "hydrosphere": "rivers-lakes",
+      "economic_role": "agricultural",
+      "settlement_pattern": "distributed-rural",
+      "industrial_corridor": "west_reach",
+      "notes": "primary inhabited world; K2V habitable zone; genuine agricultural potential found by founding pastoral cooperative; temperate conditions, good soil, river-valley farmland; Wave 3 settlement ~300 years old; population peaked ~80 years ago and in slow consistent decline as young adults leave for inner-corridor systems offering more economic variety; self-governing council of landholders (reformed ~150 years ago to include non-agricultural members); no Assembly or Compact presence; Gate Corporation maintenance rotation is extent of institutional contact"
+    },
+    {
+      "body_id": "GJ42c-1",
+      "proper_name": null,
+      "body_type": "moon",
+      "orbit_index": 1,
+      "parent_body_id": "GJ42c",
+      "inhabited": false,
+      "population": null,
+      "mass_class": "dwarf",
+      "surface_gravity": 0.07,
+      "orbital_period_days": 21.4,
+      "rotation_period_hours": 513.6,
+      "atmosphere": "none",
+      "biome_summary": "barren",
+      "hydrosphere": null,
+      "economic_role": null,
+      "settlement_pattern": null,
+      "industrial_corridor": null,
+      "notes": "Poperinge's single moon; tidally locked; used in local calendar reckoning by farming community"
+    },
+    {
+      "body_id": "GJ42d",
+      "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": 510.0,
+      "rotation_period_hours": 21.2,
+      "atmosphere": "thin",
+      "biome_summary": "arid",
+      "hydrosphere": null,
+      "economic_role": null,
+      "settlement_pattern": null,
+      "industrial_corridor": null,
+      "notes": "dry rocky world beyond habitable zone; thin atmosphere; polar ice caps; surveyed early settlement era, no viable resource concentration found"
+    },
+    {
+      "body_id": "GJ42-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; early prospectors found insufficient concentration for cooperative extraction economics; no active operations"
+    },
+    {
+      "body_id": "GJ42e",
+      "proper_name": null,
+      "body_type": "gas_giant",
+      "orbit_index": 5,
+      "parent_body_id": null,
+      "inhabited": false,
+      "population": null,
+      "mass_class": "gas_giant",
+      "surface_gravity": 2.1,
+      "orbital_period_days": 2200.0,
+      "rotation_period_hours": 11.4,
+      "atmosphere": "hydrogen-helium",
+      "biome_summary": null,
+      "hydrosphere": null,
+      "economic_role": null,
+      "settlement_pattern": null,
+      "industrial_corridor": null,
+      "notes": "mid-system gas giant; amber-tan banding; no active resource extraction"
+    },
+    {
+      "body_id": "GJ42e-1",
+      "proper_name": null,
+      "body_type": "moon",
+      "orbit_index": 1,
+      "parent_body_id": "GJ42e",
+      "inhabited": false,
+      "population": null,
+      "mass_class": "dwarf",
+      "surface_gravity": 0.08,
+      "orbital_period_days": 12.6,
+      "rotation_period_hours": 302.4,
+      "atmosphere": "none",
+      "biome_summary": "barren",
+      "hydrosphere": null,
+      "economic_role": null,
+      "settlement_pattern": null,
+      "industrial_corridor": null,
+      "notes": "inner gas giant moon; dark cratered surface"
+    },
+    {
+      "body_id": "GJ42e-2",
+      "proper_name": null,
+      "body_type": "moon",
+      "orbit_index": 2,
+      "parent_body_id": "GJ42e",
+      "inhabited": false,
+      "population": null,
+      "mass_class": "dwarf",
+      "surface_gravity": 0.06,
+      "orbital_period_days": 27.8,
+      "rotation_period_hours": 667.2,
+      "atmosphere": "none",
+      "biome_summary": "ice",
+      "hydrosphere": null,
+      "economic_role": null,
+      "settlement_pattern": null,
+      "industrial_corridor": null,
+      "notes": "outer gas giant moon; icy surface; subsurface ice confirmed"
+    },
+    {
+      "body_id": "GJ42f",
+      "proper_name": null,
+      "body_type": "planet",
+      "orbit_index": 6,
+      "parent_body_id": null,
+      "inhabited": false,
+      "population": null,
+      "mass_class": "terrestrial",
+      "surface_gravity": 0.42,
+      "orbital_period_days": 5800.0,
+      "rotation_period_hours": 18.4,
+      "atmosphere": "none",
+      "biome_summary": "frozen",
+      "hydrosphere": null,
+      "economic_role": null,
+      "settlement_pattern": null,
+      "industrial_corridor": null,
+      "notes": "outer ice-rock world; methane frost surface; uninhabited"
+    },
+    {
+      "body_id": "GJ42g",
+      "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": 14000.0,
+      "rotation_period_hours": 14.2,
+      "atmosphere": "none",
+      "biome_summary": "frozen",
+      "hydrosphere": null,
+      "economic_role": null,
+      "settlement_pattern": null,
+      "industrial_corridor": null,
+      "notes": "outer ice dwarf; trans-neptunian analog"
+    },
+    {
+      "body_id": "GJ42h",
+      "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": 31000.0,
+      "rotation_period_hours": 11.8,
+      "atmosphere": "none",
+      "biome_summary": "frozen",
+      "hydrosphere": null,
+      "economic_role": null,
+      "settlement_pattern": null,
+      "industrial_corridor": null,
+      "notes": "distant outer ice dwarf; scattered disk object"
+    },
+    {
+      "body_id": "GJ42i",
+      "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": 58000.0,
+      "rotation_period_hours": 10.2,
+      "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"
+    },
+    {
+      "body_id": "GJ42-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": "GJ42-oort-S1",
+      "proper_name": "Langemark Horizon",
+      "orbits_body_id": "GJ42-oort",
+      "station_type": "horizon",
+      "population": 2000,
+      "economic_role": "transit",
+      "docking_class": "major",
+      "has_gate_infrastructure": true,
+      "notes": "two-aperture through-route horizon station; maintained under standing 10-year commercial agreement with Gate Corporation; Gate Corp maintenance team rotates every 14 months; modest permanent crew handles transit scheduling and corridor resupply; connects Echternach inbound and Bout du Chemin outbound; deliberate non-growth policy — council views the station as infrastructure, not community expansion"
+    }
+  ]
+}
diff --git a/wiki/star-systems/GJ-42/index.md b/wiki/star-systems/GJ-42/index.md
index 129def19a..55c4b5784 100644
--- a/wiki/star-systems/GJ-42/index.md
+++ b/wiki/star-systems/GJ-42/index.md
@@ -46,6 +46,31 @@ Three hundred years of deliberate distance from the corridor's institutional str
 
 `wave_3` at hop 14 reflects genuine early deep-frontier push by a small cooperative that followed the gate path as far as it went and stopped where they found what they wanted. The K2V star is standard — the system's interest is historical and social, not environmental. `through_route` topology with two gates means Langemark is on a path to GJ 282A, which means something is further out; the existence of GJ 529 beyond this chain makes Langemark's "edge of the map" character only relative — there is one more hop beyond. The name "Langemark" is a genuine WWI battlefield name used here as a founding-generation personal-heritage choice, providing Germanic corridor consistency and a specific kind of historical weight without being a German city name transplanted wholesale.
 
+## Celestial Bodies
+<!-- READ-ONLY — generated from systems.db bodies/stations tables -->
+
+| Orbit | ID | Name | Type | Inhabited | Pop | Mass | Gravity | Year (d) | Day (h) | Atmo | Biome | Hydro | Economy | Settlement | Industrial |
+|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
+| 1 | `GJ42b` | — | planet | no | — | terrestrial | 0.64g | 52 | 1248.0 | none | barren | — | — | — | — |
+| 2 | `GJ42c` | Poperinge | planet | yes | 55K | terrestrial | 0.89g | 200 | 24.8 | breathable | temperate | rivers-lakes | agricultural | distributed-rural | west_reach |
+| ↳ 2.1 | `GJ42c-1` | — | moon | no | — | dwarf | 0.07g | 21 | 513.6 | none | barren | — | — | — | — |
+| 3 | `GJ42d` | — | planet | no | — | terrestrial | 0.52g | 510 | 21.2 | thin | arid | — | — | — | — |
+| 4 | `GJ42-belt` | — | asteroid_belt | no | — | — | — | — | — | — | — | — | — | — | — |
+| 5 | `GJ42e` | — | gas_giant | no | — | gas_giant | 2.10g | 2200 | 11.4 | hydrogen-helium | — | — | — | — | — |
+| ↳ 5.1 | `GJ42e-1` | — | moon | no | — | dwarf | 0.08g | 13 | 302.4 | none | barren | — | — | — | — |
+| ↳ 5.2 | `GJ42e-2` | — | moon | no | — | dwarf | 0.06g | 28 | 667.2 | none | ice | — | — | — | — |
+| 6 | `GJ42f` | — | planet | no | — | terrestrial | 0.42g | 5800 | 18.4 | none | frozen | — | — | — | — |
+| 7 | `GJ42g` | — | planet | no | — | dwarf | 0.07g | 14000 | 14.2 | none | frozen | — | — | — | — |
+| 8 | `GJ42h` | — | planet | no | — | dwarf | 0.05g | 31000 | 11.8 | none | frozen | — | — | — | — |
+| 9 | `GJ42i` | — | planet | no | — | dwarf | 0.04g | 58000 | 10.2 | none | frozen | — | — | — | — |
+| 10 | `GJ42-oort` | — | oort_cloud | no | — | — | — | — | — | — | — | — | — | — | — |
+
+### Stations & Facilities
+
+| ID | Name | Type | Orbits | Population | Economy | Governance | Docking | Gate | Districts |
+|---|---|---|---|---|---|---|---|---|---|
+| `GJ42-oort-S1` | Langemark Horizon | horizon | `GJ42-oort` | 2K | transit | — | major | yes | 1 |
+
 ## Topology
 <!-- READ-ONLY — regenerated from star-map.json edges -->
 - **Hop Distance from Gateway:** 14