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The Beta Quadrant was the common designation for one-quarter of the Milky Way Galaxy. It was adjacent to the Alpha and Delta Quadrants. One-quarter of the galactic core was located in this quadrant. (Star Trek: Voyager, Season 7 production art; [1]Star Trek Into Darknessdisplay graphics)
Part of the United Federation of Planets was located in the Beta Quadrant, along with the bulk of the Klingon and RomulanEmpires, including their homeworlds of Qo'noS and Romulus. (Star Trek: Insurrectiondisplay graphic; DIS: "Context Is for Kings" display graphic; PIC: "The End is the Beginning"; PRO: "Starstruck").
The Yattho, a species known for their precognitive abilities, were native to the Beta Quadrant. (VOY: "Before and After")
History[]
In 2259, the R'ongovian Protectorate held a small but strategically-important region of space in between Klingon and Romulan territory; the Federation sought an alliance with them to secure a safe path to the other side of the Beta Quadrant. (SNW: "Spock Amok")
In 2293, the starshipUSS Excelsior, commanded by CaptainHikaru Sulu, completed a three-year exploratory voyage in the Beta Quadrant which included cataloging gaseous anomalies. (Star Trek VI: The Undiscovered Country)
In 2363, Captain Lisa Cusak and the crew of the USS Olympia began an eight-year mission in the Beta Quadrant. Following this mission, the Olympiacrashed on a planet in the Rutharian sector en route back to Federation space. While escorting a convoy to the Vegan system in 2374, the crew of the USS Defiant made contact with Cusak in 2371 via a temporal anomaly. (DS9: "The Sound of Her Voice")
In an alternate timeline, the USS Voyager used a quantum slipstream drive to cross the Delta and Beta Quadrants, before crashing on a class L planet in the Takara sector, a few parsecs short of reaching the Alpha Quadrant. Also in this timeline, Starfleet Intelligence had salvaged a Borg temporal transmitter from the debris of a Borg cube in the Beta Quadrant. (VOY: "Timeless")
A Borg scout ship, crewed by Axum and other liberated drones, was located in a remote sector of the Beta Quadrant patrolling the border of fluidic space. (VOY: "Unimatrix Zero, Part II")
When members of the Hierarchy captured Captain Janeway and forced The Doctor to obtain Voyager's warp core for them, he impersonated Janeway and told CommanderChakotay a cover story involving a fictitious R'Kaal Imperium which supposedly controlled "thousands of parsecs from here to the edge of the Beta Quadrant." (VOY: "Renaissance Man")

The Borg transwarp network
The Borg maintained at least one transwarp hub and thousands of exit apertures in the Beta Quadrant until 2378, when the entire transwarp network was destroyed by the USS Voyager. (VOY: "Endgame")
In the 2380s, the Romulan supernova threatened the lives of billions of people in this quadrant within its burst radius. (PIC: "The End is the Beginning")
In 2384, the Janeway wormhole was located on the Beta Quadrant border. (PRO: "Into the Breach, Part II")
Captain Riker – holoprogram[]

Beta Quadrant in Riker's service record
In 2367, while exploring a cavern on Alpha Onias III, Commander William T. Riker was rendered unconscious by gases. While unconscious, neural scanners scanned Commander Riker's brain. The scanners used elements of Riker's reality and constructed a holoprogram with those elements interspersed throughout, so that it felt real to him. What Riker wanted, the scanners made possible.
In one of these simulations, the Axanar hosted a conference on Beta Quadrant exploration and Federation security that was held at the Deneva Special Congress on Interstellar Affairs. On Stardate 52384, Captain Riker, the commanding officer of the USS Enterprise-D, was selected for recognition as the special Federation representative to this conference. In 2383, the quadrant was mentioned in Riker's service record that was on display in his quarters on the Enterprise-D. (TNG: "Future Imperfect" okudagram)
Governments[]
- Acamarian Ruling Council
- Gorn Hegemony
- Iconian Empire
- Klingon Empire
- R'ongovian Protectorate
- Romulan Free State
- Romulan Star Empire (until 2387)
- United Federation of Planets
Homeworlds[]
- Acamar III
- Alpha Carinae II
- Ardana
- Argelius II
- Beta Antares IV
- Cheron
- Denobula
- Iconia
- Kantare
- Kolarus III
- Krios Prime
- Nausicaa
- Pahvo
- Qo'noS
- Ramatis III
- Remus
- Romulus
- Sigma Iotia II
- Tagus III
- Thasus
- Tiburon
- Valt Minor
- Vendor
Colonies and outposts[]
- Ajilon Prime
- Alpha Eridani II
- Amargosa observatory
- Archanis IV (Archanis IV Research Outpost)
- Beta Agni II
- Boreth
- Carraya IV
- Cestus III (Colony Cestus III)
- Chaltok IV
- Corvan II
- Delta Outpost
- Doctari Alpha (Doctari Alpha Research Outpost)
- Earth Outpost Station
- Epsilon Outpost
- Freecloud
- Gamma Hydra (Andoriancolony)
- Gamma Hydra IV (Federation Experimental Science Colony)
- H'atoria
- Jouret IV (New Providence colony)
- Khitomer (Khitomer Outpost)
- Korvat colony
- Lya IV
- M-Zed-5
- Narendra III
- Nivalla
- Nuzzo Station
- Okrand Colony
- Qu'Vat (Qu'Vat Colony)
- Regula I
- Relay Station 47
- Rura Penthe
- Science Station 0812
- Science Station Delta-05
- Septra
- Tarod IX
- Terra 10
- Terralysium
- Turkana IV
- Vashti
Starbases[]
- Deep Space 2
- Deep Space 4
- Deep Space 6
- Deep Space Station K-7
- Lya III starbase
- Starbase 18
- Starbase 23
- Starbase 24
- Starbase 36
- Starbase 39-Sierra
- Starbase 88
- Starbase 105
- Starbase 117
- Starbase 152
- Starbase 157
- Starbase 173
- Starbase 234
- Starbase 343
- Starbase 718
Spatial landmarks[]
- 'etnap Nebula
- Arachna
- Azure Nebula
- Baber Nebula
- Barnes Nebula
- Bassen Rift
- Chantico Nebula
- Coalsack Nebula
- 'etnap Nebula
- Foster Nebula
- Frazee's Nova
- Friedlich Nebula
- Gullory Nebula
- Hodges Nebula
- Hromi Cluster
- Janeway wormhole (Alpha Quadrant border)
- Mutara Nebula
- Paulson Nebula
- Ryton Nebula
- Stevens Nebula
- Typhon Expanse
- Winter's Nova
- Wise Nebula
Sectors[]
- Antares sector
- Archanis sector
- Argelius sector
- Carraya sector
- Gamma Hydra sector
- Hyralan sector
- Kaleb sector
- Mempa sector
- Mutara sector
- Sector 004
- Sector 010
- Sector 23
- Sector 30
- Sector 31
- Sector 45
- Sector 52
- Sector 70 (Qo'noS sector)
- Sector 134
- Sector 142
- Sector 230
- Sector 234
- Sector 542
- Sector 1607
- Sector 2158 (Yadalla sector)
- Sector 21166
- Sector Z-6
Regions[]
Appendices[]
See also[]
Related links[]
Background information[]
Alpha/Beta quadrant border[]
The Star Trek Encyclopedia, 2nd ed., p. 393 states that the Federation was spread across the Alpha and Beta Quadrants, with Earth as the border between, in order to explain why the USS Enterprise was often the "only ship in the quadrant", though the term quadrant has been often used to refer to smaller segments of the galaxy as well. The maps in the Star Trek: Star Charts also use Earth as the border between the Alpha and Beta quadrants.
Graphics used in astrometrics for Star Trek: Voyager, starting with the episode "Year of Hell", and on a PADD on Picard's ready room desk in Star Trek: Insurrection, also have Earth and the Federation straddling the border between the two quadrants. [4]

"Alpha/Beta Quadrant Overview" map seen in the background of "Context Is for Kings", et al.
Dialogue in Star Trek: Deep Space Nine and Star Trek: Voyager, however, firmly establish that Earth is located on the Alpha Quadrant side of the border. Graphics used in Star Trek: Discovery and the alternate reality films support this, where the Alpha/Beta Quadrant border is moved one sector "west" and a star chart graphic used in Star Trek Into Darkness had the label "Alpha Quadrant" near Sector 01 (Level 3-B), which contains Earth. [5]
According to the Star Trek Encyclopedia, 2nd ed., p. 393, Federation, Klingon, and Romulan territories are situated in both the Alpha and Beta quadrants. Dialogue from Deep Space Nine and Voyager exclusively referred to all three powers and governments in their vicinity as Alpha Quadrant powers.

The in-game map of the apocryphal Star Trek Online video game, depicting Klingon and Romulan space in the Beta Quadrant
In most reference works, novels, and games, Klingon and Romulan space are usually depicted or stated to be located solely in the Beta Quadrant. This would make the Federation the only government spanning both quadrants.
The video game Star Trek Online is largely faithful to the Star Charts representation of the galaxy, with a few systems moved for gameplay considerations.
According to the Star Charts, most of the early voyages of Enterprise NX-01 took place in the Beta Quadrant with only a few excursions in the Alpha Quadrant.
The Fen Domar, with whom Voyager was engaged in battle in an alternate timeline, may very likely be a Beta Quadrant civilization. This is based on the ship's close proximity to the quadrant's border in "Endgame" and AdmiralKathryn Janeway's comments that the ship would have encountered them just a few years after the events of that episode.
According to Star Trek: Star Charts, the Beta Quadrant was home to the Vulcans, Andorians, Orions, Bolians, Son'a, Risians, Organians, Coridanite, Axanar, Nausicaans, Suliban, Gorn, and many other alien races.
External link[]
- Beta Quadrant at Memory Beta, the wiki for licensed Star Trek works