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
Segmentum Tempestus fortress
Naval headquarters for the southern segmentum — the quietest of the five, spared the Eye and the Maelstrom and left to deal with xenos raiders instead.
Era Indomituspost-Rift
imperiumImperium Sanctus
Segmentum Tempestus fortress
Wholly inside Imperium Sanctus, and now one of the few segmentum commands still able to report to Terra normally.
Position
Map frame: 430, 780 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 289 units ≈ 30.7k light years, south of the galactic core.
Height above the disk plane: 8.4 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Bakka System
Books set here
2 titles in the reading tracker touch this record. Titles link out to the tracker.
derived: Segmentum Tempestus is the southern segmentum; Bakka placed deep in it, south-east of Krieg and Ophelia VII per the relative ordering of the three on Lexicanum's Tempestus segmentum map
book-linkhigh
wh40k.lexicanum.com/wiki/Bakka named in two tracked books. The Iron Kingdom (dawn-of-fire::dof-main::5): cites its appendix for the M42 siege of Bakka during the Noctis Aeterna and the relief by Indomitus Crusade Fleet Octus — the only citation that names this world itself, filed at role 'mentioned'. Battle for the Abyss (horus-heresy::hh-main::8): the sole source behind https://wh40k.lexicanum.com/wiki/Bakka_System, whose chapter eight docks the Furious Abyss for coolant repairs and stages the loyalist boarding assault at the yards. That dock is Bakka Triumveron, a gas giant in this system and not this world, so that link is 'visited' at SYSTEM granularity and no closer, and is recorded here so the distinction is not lost