This archive tracks four layers. A record present in 1 of them (M41) 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
Imperial world engulfed by a warp storm and a daemonic incursion
An Imperial world of Segmentum Tempestus. In the closing days of M41 a sudden, violent warp storm unleashes the hordes of the Ruinous Powers on it; a Dark Angels company is already fighting there when Sven Bloodhowl's Space Wolves arrive, guided by their Rune Priests, to find the Wulfen (Curse of the Wulfen).
Era Indomituspost-Rift
[RECORD LOST]
No record for this location in Era Indomitus.
Position
Map frame: 540, 850 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 352 units ≈ 37.5k light years, south of the galactic core.
Height above the disk plane: 7.9 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Tranquilitus System
Books set here
1 title in the reading tracker touches this record. Titles link out to the tracker.
Every fact in this record, and where it came from. Editorial derivations say so.
identityhigh
wh40k.lexicanum.com/wiki/Tranquilitus (read in a browser with fetch-page.mjs, 2026-10-12): 'Tranquilatus is an Imperial world. It was the site of a major daemonic incursion and a tense, near-fratricidal standoff between the Space Wolves and the Dark Angels'; 'Wolf Lord Sven Bloodhowl led the Space Wolves of Strike Force Sagablade to Tranquilatus' (Curse of the Wulfen (Novel), Chapter 4; Epilogue). Infobox Segmentum Tempestus, Affiliation Imperium; Sector, Subsector, System, Population and Class blank. Label: the page title and Lexicanum's Hunt_for_the_Wulfen spell it Tranquilitus; the page text spells it Tranquilatus, kept as an alias. NAME-COLLISION CHECK: no index record uses either spelling.
book-joinhigh
VISITED for Curse of the Wulfen: Chapter 4 is set there (Lexicanum Tranquilitus, 1a/1b). The outcome of the standoff is kept in SPOILERS.
segmentumhigh
tempestus: Lexicanum Tranquilitus infobox 'Segmentum: Segmentum Tempestus', cited to the novel, and the page's category Segmentum Tempestus.
classlow
'temperate', with no look words to go on: the infobox Class is blank and no permitted page describes the terrain. The neutral settled-world ramp asserts nothing; revisit if a source describes the world.
gposlow
inferred: segmentum-level only. Canon gives Segmentum Tempestus and nothing finer. Placed at (540, 850), inside the tempestus polygon in regions.json and clear of every other marker (nearest rostin-v at 60.2 units). The point carries no information beyond the segmentum. Z 7.9 is the zPolicy value (compute-z.mjs tranquilitus 540 850).
erashigh
m41 only, the era of its one source (the novel, 'In the closing days of the 41st Millennium'). Allegiance 'imperium'.
systemIdlow
'tranquilitus', named for the world because no system is published (Lexicanum's System field is blank).
no-system-surveyhigh
No systems/tranquilitus.json: canon names no star, sibling body or body count. The map synthesises its globe from this record.