|This article or subsection has an associated category.||Vulcan system|
40 Eridani is a trinary star system comprised of a giant primary star, 40 Eridani A, and two other stars. The other two stars in the system are a red dwarf and a white dwarf, 40 Eridani B and 40 Eridani C. The stars of the 40 Eridani group support the Vulcan system, the home system of the Vulcan race and their homeworld of Vulcan. It is visible from Earth in the constellation of Eridanus located approximately 16.45 light-years distant. (ST reference: Star Fleet Technical Manual; DS9 novel: Field Trip; ENT episodes: "Home", "Daedalus")
- The Starfleet Technical Manual, a licensed work, established the location of Vulcan at 40 Eridani, a real star system that modern astronomers have observed. While the 1973 Technical Manual reference was the earliest description of this system's inhabitation, the system location was not established in canon until episodes of Enterprise described the world as being 16 light years from Earth, the real-life measurement of 40 Eridani's distance. The ST reference: Spaceflight Chronology is one source that differed with canon, listing the Vulcan system as orbiting Epsilon Eridani, a system that is not 16 ly away. Likewise, the Star Trek Online website's defunct Points of Interest section stated that Vulcan is located in the Sirius system, a star 8.6 LY from Sol (though the game itself gives the 40 Eri location in the Vulcan system's tooltip).
- The system has an ID code of 39 in the game software and the player is likely to encounter a Starfleet patrol or Federation trader here.
|Stars, systems and objects of the Eridanus constellation|
|1 Eridani (Tau-1 Eridani) • 3 Eridani (Azha, Eta Eridani) • 13 Eridani (Zibal, Zeta Eridani) • 14 Eridani • 18 Eridani (Delta Orcus, Toredar, Epsilon Eridani) • 23 Eridani (Rana, Delta Eridani) • 34 Eridani (Gamma Eridani, Zaurak) • 38 Eridani (Beid, Omicron-1 Eridani) • 40 Eridani (Keid, Omicron-2 Eridani, Vulcanis) • 59 Eridani • 67 Eridani (Cursa, Beta Eridani) • 82 Eridani • 88 Eridani • 198 Eridani • Alpha Eridani (Achernar) • Beta Eridani (Cursa, 67 Eridani) • Chi Eridani (Caleb, Kaleb) • Delta Eridani (Rana, 23 Eridani) • Epsilon Eridani (Delta Orcus, Toredar, 18 Eridani) • Eta Eridani (Azha, 3 Eridani) • Gamma Eridani (34 Eridani, Zaurak) • Iota Eridani • Omicron-1 Eridani (Beid, 38 Eridani) • Omicron-2 Eridani (Keid, 40 Eridani, Vulcanis) • p Eridani • Tau-1 Eridani (1 Eridani) • Tau Eridani Cloud • Theta Eridani (Acamar) • Zaurak (34 Eridani, Gamma Eridani) • Zeta Eridani (Zibal, 13 Eridani)|
|Sirius sector block|
|Orion sector||Kinjer system (Kinjer Prime) • Lackey system (Lackey III) • Reytan system (Reytan) • Starbase 24 (Starbase 24's system) • Una system (Una II)|
|Orion trinary system||Stars: Pi-3 Orionis trinary star (Orion A, Orion B, Orion C)|
|Planets and moons: I. Orion I • III.: Orion III/Orion Prime (Luna Orionis) • Hoan • Thaspa|
|Risa sector||Bomari system (Bomari II) • Donia system (Donia) • Gamma Orionis transwarp conduit • Imaga system (Imaga • Imaga II) • Koolhaas system (Koolhaas) • Omar system (Omar) • Tazi system (Tazi)|
|Risa system||Stars and outposts: Epsilon Ceti A • Epsilon Ceti B (Granicus binary) • Epsilon Ceti C • Epsilon Ceti Outpost|
|Planets: Epsilon Ceti B I (Suam) • B II.: Risa (Inobe) • Lowoion • Rusanej|
|Vulcan sector||Beytan system (Beytan V) • Bhea system (Bhea) • Delta Volanis Cluster • Kei system (Kei III) • P'Jem system (P'Jem) • Pellme system (Pellme II) • Pico system (Pico) • Wolf 359 system|
|Vulcan system||Stars: 40 Eridani A • 40 Eridani B • 40 Eridani C|
|Planets and moons: I. Ket-Cheleb • II & III.: Vulcan • T'Khut (T'Rukhemai) • IV. Tel-Alep • V. Kal-Apton • VI. Kir Alep • Vulcanis VII • Delta Vega|
|Alpha and Beta Quadrant stars and star systems (O)|
|Oblik • Oby • Occult • Ochs • Octif • Odal • Odib • Ohniaka • Ohop • Olassa • Olio • Oltion • Omega • Omega-2 Cygni • Omega Corvus • Omega Cygni (Cygnet, Maluria) • Omega Draconis • Omega Maelstrom • Omicron Indi • Omicron Pascal • Omicron Testus • Onelia • Onza • Oomaru system (Oomaru) • Oorego • Ophiucus • Opla • Orda-877 • Ordover • Oriens Delta • Orsa • Orwell • Osinar|
|Alpha Quadrant stars and systems (O)||Olmerak • Omega Aurigae • Omega Piscium • Omega Sagitta • Omega Sagittarii • Omicron Draconis • Omicron Persei • Orellius • Orias • Osadj|
|Beta Quadrant stars and systems (O)||Ogat • Omega Fornacis • Omicron Ceti • Omicron Eridani • Omicron Gruis • Omicron Leonis • Omicron Eridani (Omicron-1 Eridani • Omicron-2 Eridani: Omicron-2 Eridani A, Omicron-2 Eridani B, Omicron-2 Eridani C) • Oraco • Organia system • Orion • Ossec • Otha Prime|
- The Worlds of the Federation omits mention of the second and third star amd additional planets outside of the asteroid belt. The film Star Trek also established another planet called Delta Vega, which orbited close enough to Vulcan that it could be seen clearly from Delta Vega's surface. According to the novelization of that film, a planet named T'Khul is "the Vulcan system's third world."