A sector is an Imperial astrographical and political division of space that is one of the constituent territorial units of a segmentum of the Milky Way Galaxy. The size of a sector varies according to local demands and stellar density.
A "typical" sector, if such a thing could be said to exist, might encompass 7 million cubic light years, equivalent to a cube with sides almost 200 light years long.
Sectors are divided into a variable number of sub-sectors, each usually comprising between 2 and 8 star systems within a 10 light year radius (some may encompass more systems -- others only 1).
This size is governed by the practical patrol ranges of Imperial starships. Because sub-sectors are divisions of worlds (rather than volumes of space) there are vast numbers of star systems within each sector which do not fall officially within a sub-sector. These are referred to as "inter-sectors" -- and are commonly better known as Wilderness Space, forbidden zones, empty space and frontier space.
Inter-sectors may contain gas or dust nebulae, inaccessible areas, alien-inhabited star systems, unexplored systems, uninhabited systems and uninhabitable worlds.
Each sector has an Imperial Navy battlefleet assigned to the task of safeguarding it, and the battlefleet is generally named after the sector it is assigned to (i.e. Battlefleet Gothic is located in the Gothic Sector, Battlefleet Cadia is located in the Cadian Sector, etc.).
Notable Sectors
Sub-Sector (s) |
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Acteron | Pandraxx | Eastern Fringe | See Pandraxx Sub-sector | See Pandraxx Sub-sector | |
Affluix | Unknown | Unknown | Unknown | Peregrim's World | Innerwyrm Genestealer Cult infestation |
Agripinaa | Unknown | Segmentum Obscurus | See Agripinaa Sector | See Agripinaa Sector | |
Amerikon | Unknown | Segmentum Tempestus | Unknown | Unknown | |
Armageddon | Armageddon Justicar |
Segmentum Solar | See Armageddon Sub-Sector | ||
Askellon | Asphodel Depths Cyclopia |
Segmentum Obscurus | See Askellon Sector | See Askellon Sector | |
Athelaq | Unknown | Unknown | Unknown | Unknown | |
Badab | Unknown | Ultima Segmentum | See Badab Sector | See Badab Sector | |
Barbarus | Urphir | Segmentum Tempestus | Anphellion | Beta Anphelion IV (satellite) | |
Bastion | See Bastion Sector | Unknown | Unknown | Solo-Baston | |
Cadian | Cadian | Segmentum Obscurus | Cadian | See Cadian System | |
Cal-Sek | Unknown | Unknown | Unknown | Unknown | See Fenright Tithe Wars |
Caligari | Unknown | Segmentum Tempestus | See Caligari Sector | See Caligari Sector | |
Calixis | Golgenna Reach Drusus Marches |
Segmentum Obscurus | See Calixis Sector | See Calixis Sector | |
Caradryad | Unknown | Segmentum Tempestus | Unknown | Unknown | |
Charadon | Unknown | Ultima Segmentum | Unknown | Charadon | |
Chiros | Kalidar Sub-Sector Agritha Sub-Sector |
Segmentum Tempestus | Kalidar System |
||
Chonma | Unknown | Segmentum Solar | Unknown | ||
Crucis | Unknown | Unknown | Unknown | Laius Rift | |
Demeter | Unknown | Ultima Segmentum | Pandorax System | ||
Duros | Unknown | Unknown | Unknown | Unknown | See WAAAGH! Thogza |
Endymion Cluster | Ultima Segmentum | See Endymion Cluster | See Endymion Cluster | ||
Formosa | Unknown | Unknown | Unknown | Glovoda, Epsilon Regalis | |
Forsarr | Kastorel-Severus | Segmentum Tempestus | Kastorel | Kastorel-Novem | |
Gothic | Bhein Morr Cyclops Cluster |
Segmentum Obscurus | See Gothic Sector | See Gothic Sector | |
Helioret | Unknown | Ultima Segmentum | Unknown | Luxor | |
Hodur | Unknown | Ultima Segmentum | Unknown | Talon, Endragiga | |
Inca | Unknown | Ultima Segmentum | Unknown | Unknown | |
Ixaniad | Unknown | Obscurus | Unknown | Scoth | |
Jericho (lost) | Unknown | Ultima Segmentum | See Jericho Reach | See Jericho Reach | |
Karthago | Unknown | Ultima Segmentum | Unknown | Sidon Ultra | |
Khymaran Drift | Ultima Segmentum | See Khymaran Drift | See Khymaran Drift | ||
Kiltor | See Kiltor Sector | Eastern Fringe | Darkfall, see Kiltor Sector | See Kiltor Sector | |
Korianis | Aurelia | Unknown | See Sub-Sector Aurelia | See Sub-Sector Aurelia | |
Lithesh | Unknown | Ultima Segmentum | Kaurava | Kronus, worlds of Kaurava System | |
Loki | Unknown | Ultima Segmentum | Rynnstar, Freiya | See Rynn's World, Badlanding | |
Magog Cluster | Ultima Segmentum | See Magog Cluster | See Magog Cluster | ||
Mangdragora | Unknown | Unknown | Unknown | Unknown | See Aegisine Crusade |
Narasima | Unknown | Segmentum Obscurus | Unknown | Banish | |
Nachmund | Nachmund Sub-sector | Segmentum Obscurus | See Nachmund Sector | See Nachmund Sector | See Nachmund Gauntlet; War of Beasts |
Nepthis | Unknown | Unknown | Unknown | Unknown | See Fenright Tithe Wars |
Octarius | Unknown | Ultima Segmentum | Unknown | See Octarius Sector | |
Pahr Sector | Unknown | Segmentum Obscurus | Unknown | Vejovium III | |
The Pale Stars | Ultima Segmentum | See The Pale Stars | See The Pale Stars | ||
Pandora | Unknown | Unknown | Unknown | Unknown | |
Priam | Unknown | Unknown | Unknown | Darkstation | |
Oriente | Unknown | Segmentum Tempestus | Unknown | Unknown | |
Reductus | Unknown | Segmentum Tempestus | Unknown | Unknown | |
Sabbat Worlds | Newfound Trailing Khan Group |
Segmentum Pacificus | Unknown | Unknown | |
Sadusyne | Unknown | Unknown | Unknown | Unknown | See Fenright Tithe Wars |
Saras | Unknown | Unknown | Unknown | Saras VII | See WAAAGH! Ugblitz |
Sargos | Unknown | Unknown | Unknown | Unknown | |
Scarus | Helican Antimar |
Segmentum Obscurus | See Scarus Sector | See Scarus Sector | |
Solar | Solar | Segmentum Solar | Sol | Terra, Mars, see Sol System | |
Talis Munus | Caerulus-Primaris | Segmentum Solar | Betalis | Betalis III, see Betalis System | |
Tamahl | Unknown | Segmentum Obscurus | Unknown | Unknown | |
Thalassi | Black Nebula | Unknown | Unknown | Unknown | location of splinter fleet of Hive Fleet Jornumgandr |
Trail of Saint Evisser | Segmentum Solar | See Trail of Saint Evisser | Trepytos | ||
Uhulis | Unknown | Segmentum Tempestus | Unknown | Krieg | |
Ulik | Unknown | Ultima Segmentum | Unknown | Unknown | |
Ullanor | Unknown | Unknown | Unknown | Ullanor, Nalkari, New Mitama | |
Ultima Sector | Ultramar | Ultima Segmentum | Macragge System, Espandor System, Veridia System, Prandium System, Parmenio System, Masali System, Talasa System | Macragge, Calth, Iax, Talasa Prime, Espandor, Konor | This sector is the home of the Ultramarines' Realm of Ultramar |
Unknown | Corvus | Ultima Segmentum | Unknown | ||
Unknown | Prath Veil | Segmentum Obscurus | Unknown | Antioc | |
Unknown | Zypher | Unknown | Unknown | Unknown | See WAAAGH! Arbuttz |
Unknown | Unknown | Ultima Segmentum | Taros | Taros II | |
Unknown Sector in Maelstrom Zone | Sagan | Ultima Segmentum | Unknown | Unknown | |
Veldin | Unknown | Unknown | Unknown | Unknown | |
Viceroy | Niaides | Ultima Segmentum | Unknown | Maginor | |
Vidar | Unknown | Eastern Fringe | Unknown | Unknown | |
Yasan | Yasan | Ultima Segmentum | Chogoris System Gartuli System Thaxis System |
Chogoris | Home sector of the White Scars Chapter planet |
Zeist | Unknown | Ultima Segmentum | Unknown | Praetonis V, Augura |
Sources
- Apocalypse (6th Edition), pg. 171
- Battle Mission (Scenario Book), pg. 9
- Battlefleet Gothic Rulebook, pp. 86, 117, (Inside Back Cover)
- Battlefleet Gothic Resources: Ships of the Gothic Sector (RPG), pg. 124
- Chapter Approved 2004, "The Cursed Founding," by Andy Hoare, Graham McNeill and Phil Kelly
- Codex: Chaos Daemons (4th Edition)
- Codex: Eye of Terror (3rd Edition)
- Codex: Genestealer Cults (8th Edition), pp. 30-31, 33, 39
- Codex: Genestealer Cults (7th Edition), pp. 19, 50
- Codex: Grey Knights (5th Edition), pg. 45
- Codex: Orks (4th Edition), pg. 8
- Codex: Space Marines (5th Edition), pp. 30, 48
- Codex: Space Wolves (5th Edition), pg. 19
- Codex Supplement: White Scars (8th Edition), pp. 8-9
- Codex: Tyranids (5th Edition), pp. 28-31
- Dark Heresy: Core Rulebook - Second Edition (RPG), pp. 322-323
- Deathwatch: Core Rulebook (RPG), pp. 322-357
- Deathwatch: Rites of Battle (RPG), pg. 156
- Imperial Armour Apocalypse II, pg. 35
- Imperial Armour Volume One - Imperial Guard & Imperial Navy
- Imperial Armour Volume Three - The Taros Campaign, pg. 18
- Imperial Armour Volume Four - The Anphelion Project, pg. 10
- Imeprial Armour Volume Five - The Siege of Vraks, Part One, pg. 6
- Imperial Armour Volume Eight - Raid on Kastorel Novem
- Imperial Armour Volume Nine - The Badab War, Part One, pp. 31, 92, 119
- Imperial Armour Volume Ten - The Badab War, Part Two, pp. 109, 125
- Imperial Armour Volume Eleven - The Doom of Mymeara, pp. 8, 74
- Index Astartes II, pg. 50
- The Sabbat Worlds Crusade (Background Book)
- Warhammer 40,000: Rulebook (5th Edition)
- White Dwarf 139, "Interstellar Travel"
- White Dwarf 140, "Interstellar Travel"
- Baneblade (Novel) by Guy Haley, pp. 17-18
- Emperor's Mercy (Novel) by Henry Zou
- Grey Knights (Novel) by Ben Counter
- Malleus (Novel) by Dan Abnett
- Rynn's World (Novel) by Steve Parker
- Shadowsword (Novel) by Guy Haley, pp. 35-36
- Warhammer 40,000: Core Book (9th Edition), pg. 24
- Warhammer 40,000: Inquisitor - Martyr (Video Game)
- Warhammer 40,000: Dawn of War (PC Game)
- Warhammer 40,000: Dawn of War - Dark Crusade (PC Game)
- Warhammer 40,000: Dawn of War - Soulstorm (PC Game)
- Warhammer 40,000: Dawn of War II (PC Game)
- Warhammer 40,000: Dawn of War II - Chaos Rising (PC Game)
- Warhammer 40,000: Dawn of War II - Retribution (PC Game)
- Black Library - The Caligari Archivum: Above and Beyond by Áron Németh
- Warhammer Community - Inquisitor: Martyr Part 4: Mysteries of the Caligari Sector
- Imperium Nihilus - Vigilus Defiant (8th Edition), pg. 1
- Warhammer 40,000: Rulebook (8th Edition), pg. 53
- Warhammer Community - New Asuryani Clash with Chaos Space Marines in the Next Warhammer 40,000 Battlebox
- Warhammer Community - 5 Things You Need to Know About Eldritch Omens From Craven Space Marines to Elegant Aeldari