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 sector world
Settled in the long colonisation of the Sabbat Worlds and grown into the administrative centre of the whole cluster.
The 41st Millenniumpre-Rift
imperium
Sector capital of the Sabbat Worlds
Where the Crusade's first great victory was won, and where its paperwork has been done ever since. The graves outside its cities outnumber the living, and every regiment in the theatre knows someone under them.
Era Indomituspost-Rift
imperium
[RECORD LOST]
[RECORD LOST]
no source we could verify records what the opening of the Great Rift did to the Sabbat sector capital.
Contested record
Class: Lexicanum's own infobox says Capital World (and calls it the sector capital) while Lexicanum's Planets List says Cemetery World. Both are true of the novels' Balhaut — an administered capital built beside the cemeteries of the Battle of Balhaut — but they are not the same classification.
Position
Map frame: 120, 520 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 381 units ≈ 40.5k light years, west of the galactic core.
Height above the disk plane: 0.8 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Balhaut 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/Balhaut infobox Class = Capital World and the lead calls it 'the sector capital of the Sabbat Worlds cluster'; https://wh40k.lexicanum.com/wiki/Planets_(List) instead types it Cemetery World. Neither published class has a render palette, so this record renders the world's habitability and flags the conflict
gposmedium
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. Balhaut is Newfound Trailing Group and the sector capital, so it sits at the middle of that sub-cluster, between Tanith and Verghast