Nocturne is the homeworld of the Salamanders Space Marine Chapter.

A Death World, Nocturne is a vast desert littered with dozens (if not hundreds) of active volcanoes. Every fifteen years, Nocturne undergoes the "Time of Trials", where its moon Prometheus begins to pull on the planet gravitationally. This causes the earthquakes and eruptions to go into overdrive, risking the eradication of Nocturne's people. To ensure survival, the people of Nocturne gather in the Sanctuary Cities, seven metropoli where they can ride out the earthquakes and subsequent freeze over that follows. After the coming of the Emperor, he equipped the Sanctuary Cities with technological marvels such as void shields and adamantium reinforcements. This in turn instills a healthy respect for life in the people of Nocturne, making the Salamanders the nicest chapter of Space Marines in the Imperium of Man. What makes them even more unusual is that the Salamanders live within the Sanctuary Cities, instead of the fortress-monastery on Prometheus (with the exceptions of the Scouts and Fire Drakes, who do their own thing).

The Planets, Systems, Regions and Sectors of the Galaxy
Imperial Homeworlds: Holy Terra - Sacred Mars
Primarch Homeworlds: Baal - Barbarus - Caliban - Chemos - Chogoris - Colchis
Cthonia - Deliverance - Fenris - Inwit - Medusa - Nostramo
Nocturne - Nuceria - Olympia - Prospero - Ultramar
Planets: Armageddon - Bakka - Cadia - Catachan - Ganymede
Hydraphur - Krieg - Kronus - Sacris - Sanctuary 101
Scelus - Tanith - Tartarus - Vigilus - Vraks - Zayth
Daemon Worlds: Plague Planet - Sortiarius
Systems and Regions: Ghoul Stars - Halo Zone - Jericho Reach - Kaurava System
Solar System - Stygius Sector - T'au Septs - Taelus System
Types of Worlds: Agri-World - Craftworld - Daemon World - Death World - Eldar World
Forge World - Fortress World - Hive World - Tomb World