This archive tracks four layers. A record present in 4 of them (HH, AoI, M41, IND) is silent in the rest, and says so.
The Horus HeresyM30–M31
imperium
One-Five-Four Four, brought to compliance
Three primarchs took this world during the Great Crusade and only one of them understood why the xenos had let them. The Eldar trap sprung here is the reason a certain primarch knew what was coming.
Age of the ImperiumM32–M40
imperium
Hive world, and a hiding place
Twenty-eight centuries later the world is a hive-choked death trap, and it is where the search for a missing primarch ends. Whether what was found there counts as him is the book's argument, not ours.
The 41st Millenniumpre-Rift
imperium
[RECORD LOST]
[RECORD LOST]
Nothing survives in the archive for The 41st Millennium.
Era Indomituspost-Rift
imperium
[RECORD LOST]
[RECORD LOST]
Nothing survives in the archive for Era Indomitus.
Position
Map frame: 905, 320.8 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 443 units ≈ 47.1k light years, north-east of the galactic core.
Height above the disk plane: -3.6 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Caldera System
Books set here
1 title in the reading tracker touches this record, 1 of them as a primary location. Titles link out to the tracker.
Every fact in this record, and where it came from. Editorial derivations say so.
classhigh
wh40k.lexicanum.com/wiki/Caldera infobox Class = Hive World, Death World; Affiliation = Imperium; lead — 'originally known to the Great Crusade as One-Five-Four Four'
historyhigh
wh40k.lexicanum.com/wiki/Caldera §History — compliance by Vulkan, Ferrus Manus and Mortarion; the campaign 'was in truth an Eldar trap to lure Ferrus Manus into a psychic labyrinth, where he could learn of the eventual Horus Heresy'
gposlow
inferred: the Caldera infobox has Segmentum, Sector, Subsector and System all empty. The only relational statement in the article is that its human population descends from Nocturne — a population origin, not a position, and not enough to file the world beside Nocturne. No segmentum is claimed; unsurveyed rim, no positional information