Alpha Centauri

Alpha Centauri was an inhabited planetary system in the Alpha Quadrant. 
This was a trinary star system organized into a binary star system (Alpha Centauri A and Alpha Centauri B) and a solitary star (Alpha Centauri C). The official names for Alpha Centauri A and Alpha Centauri B were Rigel Kentaurus and Toliman, respectively. Alpha Centauri C's official name was Proxima Centauri. 
Found in this system, the planet was home to a Human colony. ( production art; , display graphic; )
== History ==
Between 2078 and 2119, Humans founded an outpost on the planet Alpha Centauri. Among its residents in this formative period was Zefram Cochrane, who moved to the system from Earth after 2069. He left the system circa 2119 for an unknown destination. Prior to 2124, Alpha Centauri City was founded. (; , display graphic; ) Alpha Centauri was among the earliest systems to be colonized by Humans in the early space explorations. The other known systems included Terra Nova's system and Vega's system. ()
In an alternate timeline, created by Jonathan Archer being infected by interspatial parasites, the Xindi destroyed Earth in 2154 and then all other Human settlements, including Mars, Alpha Centauri, and Vega colony. ()
Prior to the 2260s, the University of Alpha Centauri was founded in this system. ()
In 2268, Kirk argued in favor of having Sargon and his companions take over the bodies of the crew, and emphasized the benefits that it might possibly have on mankind, he explained, "they used to say if man could fly, he'd have wings. But he did fly. He discovered he had to. Do you wish that the first Apollo mission hadn't reached the moon or that we hadn't gone on to Mars or the nearest star?" ()
In 2338, Starfleet science officer Greta Vanderweg was born in the Alpha Centauri system. ()
In the mid-24th century, Dr. Leah Brahms resided in this system. She was a student at the University of Alpha Centauri and graduated from this university with a Bachelor of Science in Subspace Physics, cum laude. (, okudagram)
 
In 2365, after Doctor Katherine Pulaski was abducted by , Geordi La Forge believed she planned to "lead Data on a wild goose chase and then recount the story to everyone between here and Alpha Centauri." ()
In an alternate timeline caused by the death of Gabriel Bell in 2024, Romulan transmissions were detected in the vicinity of Alpha Centauri in 2371. ()
After the Dominion invaded and conquered Betazed in 2374, they were in a position to threaten , Andor, Tellar, and Alpha Centauri. ()
=== See also ===
* Alpha Centauri City
* Centauri VII
* University of Alpha Centauri
== Stellar Cartography ==
The Alpha Centauri system was visible from Earth in the constellation Centaurus. This system was approximately 4.3 light years from Sol. 
In 2259, the location of this system was labeled on a stellar cartography chart that was seen on the 's ready room viewscreen. This system's symbol had a color, indicating that it was affiliated with the . () 
In 2293, the location of Alpha Centauri in the Milky Way Galaxy was labeled on the star chart "The Explored Galaxy", which was on display in Captain James T. Kirk's quarters aboard the . (, okudagram)
In the early 24th century, the location of Alpha Centauri was labeled in a chart used during a Section 31 briefing. ()
In 2364, the location of Alpha Centauri was labeled on a star chart of a stellar neighborhood with Sol at the center. This chart was stored in the library computer. Later that year, the chart was scanned by Outpost 63. (, production art)
In 2365, the location of Alpha Centauri was labeled in a Subspace Comm Net Ops star chart, which was seen in the courtroom on Starbase 173. This system was connected to the Sol system by a subspace line. ()
The system's location was labeled in a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters in 2399 and on the bridge of the in 2401. Alpha Centauri was in or near to Federation space. ()
In 2401, the location of Alpha Centauri was labeled on a star chart that was seen on the 's bridge viewscreen. The chart was used to show the location of the combined Starfleet-Borg armada and where it needed to go to face a galactic-level threat. ()
Later that year, this system's position was labeled on a star chart used by Captain William T. Riker during his attempt at finding the last known location of the . ()
File: Spaceflight Chronology starchart 1.jpg|The location of Alpha Centauri on a star chart
File: The Explored Galaxy.jpg|The location of Alpha Centauri in "The Explored Galaxy" star chart
== Appendices ==
=== Background information ===
According to StarTrek.com and the , Alpha Centauri (Proxima) was located about 4.3 light years from Sol. 
The association of Alpha Centauri as the fifth founding member of the Federation was referenced in the "It's Federation Day!" newspaper article, created as background material for . According to that article, Alpha Centauri had recently gained its independence. Titus Oleet, who signed the founding document of the Federation, was the system's ambassador.
According to Star Trek: Star Charts (pp. 19, 45, & 56; "United Federation of Planets IV") and Stellar Cartography: The Starfleet Reference Library' ("Federation Historical Highlights, 2161-2385"), the Alpha Centauri system was located in the Alpha Centauri sector (Sector 002). In 2120, Zefram Cochrane departed from the Alpha Centauri colony on his final voyage. In the 22nd century, this colony was a destination on the Earth trade routes and traded with Earth and . Alpha Centauri became a Federation founding member in 2161. 
The chart naming stars within twenty light years of Sol was originally drawn by Rick Sternbach for the Star Trek Spaceflight Chronology (p. 77) in the late 1970s. This chart showed Earth commercial and exploration routes after the use of warp drive began. Alpha Centauri was a stop for two major commercial routes, Epsilon Eridani-Alpha Centauri and Sol-Alpha Centauri.
Alpha Centauri was misspelled as "Alpha Centuri" in the "The Explored Galaxy" star chart graphic seen in Star Trek: The Undiscovered Country. 
In the real world, in 2012, a team of astronomers announced the discovery of , an Earth-size terrestrial planet. In the years that followed, the discovery remained stubbornly unconfirmed. Until in 2015, another team of astronomers determined that this elusive ghost planet was all along nothing more than a measurement artefact. Attempts to locate other planets orbiting Alpha Centauri A or Alpha Centauri B have been, to date, unsuccessful.
Information on this system was derived from the episodes, the reference works Star Trek: Star Charts and Stellar Cartography: The Starfleet Reference Library, and real-world sources. The reference works were used extensively in the creation of star charts seen in , , , , and . The real-world information added to the article was current as of 2025.
=== Apocrypha ===
According to Star Fleet Technical Manual, the , located in the Alpha Centauri system, was a founding member of the United Federation of Planets.
According to The Worlds of the Federation, the seventh planet in the system was the homeworld of a group of Humans, called . Evidence was found that they were in fact originally Greeks transplanted to the planet in the 3rd century BC.
The also established that Alpha Centauri was the fifth founding member of the Federation, along with Earth, Vulcan, Andoria, and Tellar.
William Shatner's Mirror Universe Trilogy (Spectre, Dark Victory, and Preserver) suggested that Zefram Cochrane lived on ; likewise, lived on the mirror Alpha Centauri IV. Spock and compared and contrasted the histories of the two universes and realized that the differences in the naming a lake on the planet (Lake Sloane in the prime universe, Lake Riker in the mirror universe) suggested that first contact may have been the point of divergence between the universes and that the divergence may have been caused by the presence of the Borg and the , a possibility disproved by .
According to the PC CD-ROM game , the 2160s-era Cochrane-500 Fusion Drive was manufactured on Alpha Centauri. These engines were well made and still in use a century later.
In the FASA role playing game, the Alpha Centaurians were the first extraterrestrial civilization Humans encountered. The historic meeting occurred in 2042 when the Earth's United Nations spacecraft, the , utilizing a Bussard collector, arrived in the Alpha Centauri system. In 2048, Zefram Cochrane, an Alpha Centarian, sent his warp drive discovery to Earth. This contrasts with Star Trek canon material, which establishes that Cochrane was an Earth-born Human.
Like in the FASA game, in the Last Unicorn role playing game and the Decipher RPG, Alpha Centauri was already inhabited by a humanoid species when Human explorers first ventured there in 2066. The Humans traded their warp drive technology for Centaurian terraforming technology, to repair Earth's shattered ecosystem in the aftermath of World War III.
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