Every fact in this record, and where it came from. Editorial derivations say so.
identityhigh
wh40k.lexicanum.com/wiki/Ithaka Explicit Ocean World; tropical islands, cold poles and water-wyrms. Novel PartFive frame and final return.
book-joinmedium
wh40k.lexicanum.com/wiki/Brothers_of_the_Snake_(Novel ) and https://wh40k.lexicanum.com/wiki/Priad exact PartsOne–Seven. PRIMARY Ithaka is an editorial framing judgement for a multi-world novel, not the only substantial setting.
segmentummedium
wh40k.lexicanum.com/wiki/Ithaka , https://wh40k.lexicanum.com/wiki/Karybdis and https://wh40k.lexicanum.com/wiki/Iorgu explicitly Obscurus; https://wh40k.lexicanum.com/wiki/Reef_Stars and exact novel list join the other ReefStars worlds to that secondary regional context, not a canonical coordinate.
gposlow
inferred: [330,250] is an editorial marker in the existing Obscurus boundary, with no canonical distances; Karybdis shares Ithaka XY because it is its moon. Z from compute-z.mjs.
classmedium
Explicit Ocean World; tropical islands, cold poles and water-wyrms. Novel PartFive frame and final return.
systemIdlow
Editorial rendering identity; no named star or sibling-world inventory inferred.
surveylow
TRUNCATED: only Ithaka and its explicitly named moon Karybdis; star/orbits/sizes editorial, no completeness claim.