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 mining world
An Imperial mining world guarded by system defence ships, where a murderous shadow preys on the faithful and a genestealer lair grows. Inquisitor Sigma sends the newly formed Talon Squad down to it on its first mission, Operation Night Harvest (Deathwatch).
Era Indomituspost-Rift
[RECORD LOST]
No record for this location in Era Indomitus.
Position
Map frame: 929.7, 595.5 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 440 units ≈ 46.8k light years, east of the galactic core.
Height above the disk plane: -10.6 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Chiaro 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.
identityhigh
wh40k.lexicanum.com/wiki/Chiaro (read directly in a browser on 2026-10-03): 'a Mining World of the Imperium', Affiliation Imperium, Class Mining World, cited to Deathwatch (Novel) Act 1 ch. 1. https://wh40k.lexicanum.com/wiki/Reaper_Flight: Sigma's Stormravens 'deployed the Deathwatch team Talon Squad on the mining planet Chiaro for Operation Night Harvest' (Act 3 ch. 1) and retrieved them when the mission was done (Epilogue). https://wh40k.lexicanum.com/wiki/Ventria and Ultrix: system defence ships 'assigned to protect the Mining World of Chiaro' (Act 1 ch. 1). NAME-COLLISION CHECK: no index record uses the id, label or alias.
aliasesmedium
www.warhammer-community.com/en-gb/articles/mqsbmkuf/saturday-pre-orders-books-and-blood-bowl-are-up-for-grabs/ '31-Caro': Games Workshop's own copy for the 2026 paperback and Special Edition names the mission world 31-Caro ('the shadow that hunts in the dark on 31-Caro', ; 'the squad's descent into the planet of 31-Caro', https://www.warhammer-community.com/en-gb/articles/sr4taoqg/sunday-preview-orks-rampage-in-next-week/), while Lexicanum, citing the novel's chapters, names the world Talon Squad is deployed on Chiaro. Both describe the one mission of the book, so they are carried as one record; 31-Caro may be the world's catalogue designation, but no source says so. Display uses Lexicanum's chapter-cited spelling.
book-joinhigh
wh40k.lexicanum.com/wiki/Deathwatch_(Novel PRIMARY for Deathwatch: the world of Black Library's description, where Talon Squad must penetrate a genestealer lair or 'face the consequences of an entire planet's extinction' ()), opened in Act 1 ch. 1 aboard its defence ships and the target of Act 3 (Reaper_Flight).
segmentumhigh
null: Lexicanum Chiaro's infobox gives Segmentum, Sector, Subsector and System all 'Unknown' and files it under Segmentum Unknown.
classlow
'temperate', editorial: no source gives a terrain, climate or colour word for Chiaro. 'Mining World' is an economic category, not a look (desert, dead and forge were all refused for that reason), so the record takes the neutral default for an inhabited world, as Trontium VI and Herodian IV do.
gposlow
inferred: no segmentum, sector, neighbour or bearing is published, so the record claims no segmentum and sits on the unsurveyed rim at the generator's rim_xy('chiaro') = (929.7, 595.5), reproduced from build_locations.py's own fnv1a/CORE (checked against Trontium VI's stored (425.2, 931.5) and Herodian IV's (101.6, 709.2); the generator was not run). The position carries no information and must not be read as one. Z -10.6 is the zPolicy value (compute-z.mjs chiaro 929.7 595.5).
erasmedium
m41 only, the era the shelf files Deathwatch in (before the Great Rift, with Shadowbreaker). Allegiance imperium (Lexicanum Affiliation: Imperium). The status stops before the outcome, which is in the spoiler.
systemIdlow
'chiaro', named for the world: no source names its star or system. no-system-survey: canon enumerates nothing about the system (no star, no sibling body, not a body count; only that defence ships guard the world), so no systems/chiaro.json is authored and the synthesised system is the render.