This archive tracks four layers. A record present in 3 of them (AoI, 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
imperium
Imperial agricultural world
A productive, unremarkable farming world of the Sabbat cluster.
The 41st Millenniumpre-Rift
imperium
Occupied, then liberated
Taken whole by the Archenemy and held for years, its population worked and reshaped rather than simply killed. The resistance that survived underground, and the small team sent to find it, are most of what the record contains about this world.
Era Indomituspost-Rift
imperium
[RECORD LOST]
[RECORD LOST]
Nothing survives in the archive for Era Indomitus.
Position
Map frame: 78, 552 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 425 units ≈ 45.2k light years, west of the galactic core.
Height above the disk plane: -9.0 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Gereon System
Books set here
3 titles in the reading tracker touch this record, 2 of them as a primary location. Titles link out to the tracker.
wh40k.lexicanum.com/wiki/Gereon infobox Class = Agri World; https://wh40k.lexicanum.com/wiki/Planets_(List) adds 'Formerly under Chaos control'
gposlow
wh40k.lexicanum.com/wiki/Sabbat_Worlds derived: — 'a group of star systems along the edge of the Segmentum Pacificus', subdivided into the Newfound Trailing Group, the Khan Group, the Cabal Systems, the Carcaradon Cluster and the Erinyes Group. This dataset places the cluster on the rimward edge of Pacificus, anchored on Tanith and Verghast, which were already here, and gives each published sub-group its own sub-cluster. Gereon's infobox names the sector but no sub-group, and https://wh40k.lexicanum.com/wiki/Sabbat_Worlds does not list it under one, so it is placed in the cluster's unassigned rimward margin rather than inside a group it is not published as belonging to