This archive tracks four layers. A record present in 2 of them (M41, IND) is silent in the rest, and says so.
The Horus HeresyM30–M31
[RECORD LOST]
No record for this location in The Horus Heresy.
Age of the ImperiumM32–M40
[RECORD LOST]
No record for this location in Age of the Imperium.
The 41st Millenniumpre-Rift
imperium
Capital of the Helican Subsector
Took the subsector capital from Gudrun in 241.M41 and became the busiest place in Scarus: orbital docks, hive stacks and a permanent Inquisitorial presence. Held out when the 13th Black Crusade's ork tide swamped the rest of the sector.
Era Indomituspost-Rift
imperium
Besieged subsector capital
Attacked by a Chaos Balefleet during the Arks of Omen campaign, and by the last published account still under siege.
Position
Map frame: 300, 330 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 262 units ≈ 27.9k light years, north-west of the galactic core.
Height above the disk plane: 5.8 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Thracian Primaris System
Books set here
2 titles in the reading tracker touch this record, 1 of them as a primary location. Titles link out to the tracker.
wh40k.lexicanum.com/wiki/Gudrun_System derived: — 'a System of Segmentum Obscurus in the Cadian Gate region'. The Scarus Sector is placed as a group immediately spinward of Cadia, which is the only published relationship between Scarus and any world already in this dataset. Thracian Primaris is the Helican capital, placed at the centre of the Helican knot