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).

According to Starfleet Intelligence outpost maps, this system's coordinates are 0.09N 2.31W, placing it in the Starfleet Intelligence sector 4. (FASA RPG module: Star Fleet Intelligence Manual)

In 2370, Keiko O'Brien showed her students 40 Eridani on a star chart that also displayed Sol and Deep Space 9. (DS9 novel: Field Trip)

The system contained dilithium deposits. (ST video game: Fleet Command)

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.

System makeup[edit | edit source]

Appendices[edit | edit source]

Connections[edit | edit source]

Stars, systems and objects of the Eridanus constellation
1 Eridani (Tau-1 Eridani)3 Eridani (Azha, Eta Eridani)13 Eridani (Zibal, Zeta Eridani)14 Eridani18 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 Eridani67 Eridani (Cursa, Beta Eridani)82 Eridani88 Eridani198 EridaniAlpha 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 EridaniOmicron-1 Eridani (Beid, 38 Eridani)Omicron-2 Eridani (Keid, 40 Eridani, Vulcanis)p EridaniTau-1 Eridani (1 Eridani)Tau Eridani CloudTheta 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) Beta Quadrant locator logo.
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) • HoanThaspa
Risa sector Bomari system (Bomari II) • Donia system (Donia) • Gamma Orionis transwarp conduitImaga system (ImagaImaga II) • Koolhaas system (Koolhaas) • Omar system (Omar) • Tazi system (Tazi)
Risa system Stars and outposts: Epsilon Ceti AEpsilon Ceti B (Granicus binary) • Epsilon Ceti CEpsilon Ceti Outpost Alpha Quadrant locator logo.
Planets: Epsilon Ceti B I (Suam) • B II.: Risa (Inobe) • LowoionRusanej
Vulcan sector Beytan system (Beytan V) • Bhea system (Bhea) • Delta Volanis ClusterKei system (Kei III) • P'Jem system (P'Jem) • Pellme system (Pellme II) • Pico system (Pico) • Wolf 359 system
Vulcan system Stars: 40 Eridani A40 Eridani B40 Eridani C
Planets and moons: I. Ket-Cheleb • II & III.: VulcanT'Khut (T'Rukhemai) • IV. Tel-Alep • V. Kal-Apton • VI. Kir AlepVulcanis VIIDelta Vega
Alpha and Beta Quadrant stars and star systems (0-9)
5 Arietis6 Arietis7 Ursae Minoris12 Lyncis13 Arietis22 Hydrae22 Ophiuchi37 Cassiopeiae37 Serpentis47 Draconis56 Arietis57 Arietis61 Ursae Majoris74 Tauri78.56/3.54/23.4483 Beta114 Trianguli128 Trianguli334 Scorpii415 Arietis780 Arietis4725 CancriSystem 330System 7348 Alpha and Beta Quadrant icon image.
Alpha Quadrant stars and systems (0-9) 1 Herculis2 Ophiuchi3 Coronae Borealis4 Aurigae5 Coronae Borealis6 Delphini7 Aurigae7 Delphini8 Aurigae8 Canum Venaticorum10 Canum Venaticorum11 Lacerti12 Canum Venaticorum12 Draconis13 Aurigae14 Draconis14 Lyrae15 Lyncis15 Sagittae16 Ceti16 Cygni17 Andromedae17 Aquilae17 Piscis Austrini20 Draconis21 Andromedae (21 Andromedae A21 Andromedae B) • 21 Boötis24 Cassiopeiae26 Pegasi27 Herculis30 Boötis31 Aquilae33 Aurigae33 Draconis34 Aquarii34 Aurigae35 Ophiuchi37 Cygni38 Sagittarii40 Capricorni42 Boötis43 Andromedae44 Persei46 Andromedae51 Pegasi53 Aquarii53 Aquilae56 Aurigae57 Andromedae57 Serpentis59 Aquarii61 Cygni61 Draconis63 Draconis65 Herculis70 Ophiuchi92 Herculis94 Aquarii99 Herculis112 Tauri218 Persei329 Aurigae492 Lyncis1440 Ophiuchi (1440 Ophiuchi B) • 1616 Ophiuchi1865 Serpens4408 Trianguli Alpha Quadrant icon image.
Beta Quadrant stars and systems (0-9) 1 Centauri1 Orionis2 Corvi3 Canis Minoris3 Eridani5 Virginis8 Monocerotis10 Canis Minoris11 Hydrae13 Eridani14 Cancri14 Eridani14 Leonis15 Leporis16 Cancri17 Circini17 Pavonis18 Eridani23 Eridani24 Geminorum24 Orionis25 Canis Majoris26 Monocerotis26–27 Crucis27 Geminorum32 Pictoris34 Eridani34 Fornacis36 Leonis38 Eridani38 Lyncis40 Eridani (40 Eridani A40 Eridani B40 Eridani C) • 43 Pavonis46 Orionis54 Geminorum54 Orionis59 Eridani65 Cancri65 Fornacis66 Geminorum67 Eridani67 Virginis70 Ophiucus74 Orionis75 Geminorum78 Geminorum78 Pavonis82 Eridani83 Leonis (83 Leonis A83 Leonis B) • 88 Eridani88 Pavonis111 Pavonis113 Pavonis127 Scorpii128 Pavonis198 Eridani1020 Octantis1212 Muscae4403 Pavonis Beta Quadrant icon image.
Alpha and Beta Quadrant stars and star systems (K)
Ka"hatKahless systemKalisKandruKannonKanthKanthuKapeshetKaphKaplhaadKapor'AtKappaKappa XiKarazarKarhammurKarionKarnas systemKarnorKarregheniKarsKasimarKathraKaus AustralisKavrot 66Ke KwanusKedgellanKep SaluKep Salu systemKeplarKerzuk systemKestralKetoiKevratas systemKhoosinK'hotanKinkuthanzaKintirKironKlamuthKlathindKlethorKlondikeKobaxKobolKochabKohlKolarin systemKolothosKonnoriaKor Na RonKoranischatKorregKorvadKorvusKrazKreel systemKreemorianKrell systemKrychekKrylonKsoraKumarKumasiKuraK'ushuiK'ushui systemKyrKyros system Alpha and Beta Quadrant icon image.
Alpha Quadrant stars and systems (K) KalandraKappa DelphiniKappa OphiuchiKaus BorealisKavaria systemKazarKelrabiKhoslaKirKlaestron systemKohlanKoralisKornephorosKotakiKressari systemKrotar Alpha Quadrant icon image.
Beta Quadrant stars and systems (K) Kappa FornacisKeid (Keid AKeid BKeid C) • KessikKestraKhitomer systemKinjerK'lai KlinzhaiKlinzhai systemKlothosKoolhasKoreb systemKorinarKostolain systemKo'velK'tharK't'inga Beta Quadrant icon image.
Alpha and Beta Quadrant stars and star systems (O)
OblikObyOccultOchsOctifOdalOdibOhniakaOhopOlassaOlioOltionOmegaOmega Corvus • Omega Cygni (Cygnet, Maluria) • Omega DraconisOmega MaelstromOmicron IndiOmicron PascalOneliaOomaru system (Oomaru) • OoregoOphiucusOplaOrda-877OrdoverOriens DeltaOrsaOsinar Alpha and Beta Quadrant icon image.
Alpha Quadrant stars and systems (O) OlmerakOmega AurigaeOmega PisciumOmega SagittaOmega SagittariiOmicron DraconisOmicron PerseiOrelliusOriasOsadj Alpha Quadrant icon image.
Beta Quadrant stars and systems (O) OgatOmega FornacisOmicron CetiOmicron EridaniOmicron GruisOmicron Leonis • Omicron Eridani (Omicron-1 EridaniOmicron-2 Eridani: Omicron-2 Eridani A, Omicron-2 Eridani B, Omicron-2 Eridani C) • OracoOrgania systemOrionOssecOtha Prime Beta Quadrant icon image.
Alpha and Beta Quadrant stars and star systems (V)
V2292 OphiuchiVab 7791VaccaVagraValhallaVandaliaVandorVaranuVarrinaVarkienVarlosVarmunVarrekVarsiukVarsiunVehlaVehtoraVela OB2-404VelaraVelarrhVeletusVelikanVellamoVellun GammaVendrakVeneradtVeneuVerianneVerinusVerkasVerlosVermiurVernenVestiosVesuviVidettiVigan DeltaVilliamVindemiatrixVissiaVistilVitabonVojeanVolaVolanusVorkalVormiolVornekVornerVorrierVorsiukVorzunVossVotannisVotarVukierVuliunVulpecula 12VuniexVuriexVurox Alpha and Beta Quadrant icon image.
Alpha Quadrant stars and systems (V) V2500 OphiuchiValeriaValoVan Maanen's StarVandenVarianVegaVelosVenatorVentaniVentarus IdrilonVerdanisVicoVlugtaVolchokVolnar Alpha Quadrant icon image.
Beta Quadrant stars and systems (V) Vela 3AGVela PulsarVendor systemVeridianVertiliaVesperVorVor'chaVornVornaVor'nakVulcanis (Vulcanis AVulcanis BVulcanis C) Beta Quadrant icon image.

Background[edit | edit source]

  • 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."

References[edit | edit source]

External links[edit | edit source]

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