40 Eridani

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 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)
	Orion trinary system	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
	Risa system	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
	Vulcan system	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 (0-9)
5 Arietis • 6 Arietis • 6-15 • 6-23 • 7 Ursae Minoris • 12 Lyncis • 13 Arietis • 19 Tauri • 22 Hydrae • 22 Ophiuchi • 25 Tauri • 37 Cassiopeiae • 43 Aquarii • 47 Draconis • 56 Arietis • 57 Arietis • 61 Ursae Majoris • 74 Tauri • 77 Ursae Majoris • 78.56/3.54/23.44 • 83 Beta • 114 Delta • 114 Trianguli • 128 Trianguli • 334 Scorpii • 415 Arietis • 780 Arietis • 4725 Cancri • System 330 • System 7348
Alpha Quadrant stars and systems (0-9)	1 Herculis • 2 Ophiuchi • 3 Coronae Borealis • 4 Aurigae • 5 Coronae Borealis • 6 Delphini • 7 Aurigae • 7 Delphini • 8 Aurigae • 8 Canum Venaticorum • 10 Canum Venaticorum • 10 Lyrae • 11 Lacerti • 12 Canum Venaticorum • 12 Draconis • 13 Aurigae • 13 Draconis • 14 Draconis • 14 Lyrae • 15 Lyncis • 15 Sagittae • 15 Virginis • 16 Ceti • 16 Cygni • 17 Andromedae • 17 Aquilae • 17 Piscis Austrini • 20 Draconis • 21 Andromedae (21 Andromedae A • 21 Andromedae B) • 21 Boötis • 23 Draconis • 24 Cassiopeiae • 26 Pegasi • 27 Herculis • 30 Boötis • 31 Aquilae • 33 Aurigae • 33 Draconis • 34 Aquarii • 34 Aurigae • 35 Ophiuchi • 37 Cygni • 37 Serpentis • 38 Sagittarii • 40 Capricorni • 42 Boötis • 43 Andromedae • 44 Persei • 46 Andromedae • 50 Cygni • 50 Serpentis • 51 Pegasi • 53 Aquarii • 53 Aquilae • 56 Aurigae • 57 Andromedae • 57 Serpentis • 59 Aquarii • 61 Cygni • 61 Draconis • 63 Draconis • 65 Herculis • 70 Ophiuchi • 92 Herculis • 94 Aquarii • 99 Herculis • 112 Tauri • 218 Persei • 329 Aurigae • 492 Lyncis • 1440 Ophiuchi (1440 Ophiuchi B) • 1616 Ophiuchi • 1865 Serpens • 4408 Trianguli
Beta Quadrant stars and systems (0-9)	1 Centauri • 1 Orionis • 2 Corvi • 3 Canis Minoris • 3 Eridani • 5 Virginis • 8 Monocerotis • 10 Canis Minoris • 11 Hydrae • 13 Crateris • 13 Eridani • 13 Leporis • 14 Cancri • 14 Eridani • 14 Leonis • 15 Leporis • 16 Cancri • 17 Circini • 17 Pavonis • 18 Eridani • 20 Librae • 23 Eridani • 24 Geminorum • 24 Leonis • 24 Orionis • 25 Canis Majoris • 26 Monocerotis • 26–27 Crucis • 27 Geminorum • 32 Pictoris • 34 Eridani • 34 Fornacis • 36 Leonis • 38 Eridani • 38 Lyncis • 40 Eridani (40 Eridani A • 40 Eridani B • 40 Eridani C) • 43 Pavonis • 46 Orionis • 54 Geminorum • 54 Orionis • 59 Eridani • 65 Cancri • 65 Fornacis • 66 Geminorum • 67 Eridani • 67 Virginis • 70 Leonis • 70 Ophiucus • 74 Orionis • 75 Geminorum • 78 Geminorum • 78 Pavonis • 82 Eridani • 83 Leonis (83 Leonis A • 83 Leonis B) • 87 Tauri • 88 Eridani • 88 Pavonis • 89 Carinae • 94 Leonis • 111 Pavonis • 113 Pavonis • 127 Scorpii • 128 Pavonis • 128 Trianguli • 198 Eridani • 1020 Octantis • 1212 Muscae • 4403 Pavonis

Alpha and Beta Quadrant stars and star systems (K)
Ka"hat • Kahless system • Kalis • Kandru • Kannon • Kanth • Kanthu • Kapeshet • Kaph • Kaplhaad • Kapor'At • Kappa • Kappa Rho • Kappa Xi • Karazar • Karhammur • Karion • Karnas system • Karnor • Karregheni • Kars • Kasimar • Kathra • Kaus Australis • Kavrot 66 • Ke Kwanus • Kedgellan • Kep Salu • Kep Salu system • Keplar • Kerzuk system • Kestral • Ketoi • Kevratas system • Khoosin • K'hotan • Kinkuthanza • Kintir • Kiron • Klamuth • Klathind • Klethor • Klondike • Kobax • Kobol • Kochab • Kohl • Kolarin system • Kolothos • Konnoria • Kor Na Ron • Koranischat • Korgocht • Korreg • Korvad • Korvus • Kraz • Kreel system • Kreemorian • Krell system • Krychek • Krylon • Ksora • Kumar • Kumasi • Kura • K'ushui • K'ushui system • Kyr • Kyros system
Alpha Quadrant stars and systems (K)	Kalandra • Kappa Delphini • Kappa Ophiuchi • Kaus Borealis • Kavaria system • Kazar • Kelrabi • Kholfa • Kir • Klaestron system • Kohlan • Koralis • Kornephoros • Kotaki • Kressari system • Krotar
Beta Quadrant stars and systems (K)	Kappa Fornacis • Keid (Keid A • Keid B • Keid C) • Kessik • Kestra • Khitomer system • Khosla • Kinjer • K'lai Klinzhai • Klinzhai system • Klothos • Koolhaas • Koreb system • Korinar • Kostolain system • Ko'vel • K'thar • K't'inga

Alpha and Beta Quadrant stars and star systems (O)
Oblik • Oby • Occult • Ochs • Octif • Odal • Odib • Ohniaka • Ohop • Olassa • Olio • Oltion • Omega • Omega Corvus • Omega Cygni (Cygnet, Maluria) • Omega Draconis • Omega Maelstrom • Omicron Indi • Omicron Pascal • Omicron Testus • Onelia • 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

Alpha and Beta Quadrant stars and star systems (V)
V2292 Ophiuchi • Vab 7791 • Vacca • Vagra • Valhalla • Vandalia • Vandor • Varanu • Varda • Varrina • Varkien • Varlos • Varmun • Varrek • Varsiuk • Varsiun • Vehla • Vehtora • Vela OB2-404 • Velara • Velarrh • Veletus • Velikan • Vellamo • Vellun Gamma • Vendrak • Veneradt • Veneu • Verianne • Verinius • Verkas • Verlos • Vermiur • Vernen • Vestios • Vesuvi • Videtti • Vigan Delta • Villiam • Vindemiatrix • Vissia • Vistil • Vitabon • Vola • Volanus • Vorkal • Vormiol • Vornek • Vorner • Vorrier • Vorsiuk • Vorzun • Voss • Votannis • Votar • Vukier • Vuliun • Vulpecula 12 • Vuniex • Vuriex • Vurox
Alpha Quadrant stars and systems (V)	V2500 Ophiuchi • Valeria • Valo • Van Maanen's Star • Vanden • Varian • Vega • Velos • Venator • Ventani • Ventarus Idrilon • Verdanis • Vico • Vlugta • Volchok • Volnar
Beta Quadrant stars and systems (V)	Vela 3AG • Vela Pulsar • Vendor system • Veridian • Vertilia • Vesper • Vor • Vor'cha • Vorn • Vorna • Vor'nak • Vulcanis (Vulcanis A • Vulcanis B • Vulcanis C)

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]

ST video game: Fleet Command

External links[edit | edit source]

40 Eridani article at Wikipedia, the free encyclopedia.