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Star chart image.

Sirius (also known as Alpha Canis Majoris, 9 Canis Majoris, Alpha Canaris or the Alpha system) is a binary star system in Federation space consisting of companion stars named Sirius A and Shahr, located about 2.6 parsecs (8.6 light-years) from Earth, where it is visible in the constellation of Canis Major. At coordinates 0.97N 5.9E, Sirius is the location of the planet Alpha III, an important Federation colony. (TOS references: Star Fleet Technical Manual, Spaceflight Chronology; FASA RPG module: The Federation)

History and specifics

In the field of stellar cartography, Sirius is a landmark that was used in the naming of the Sirius sector block. Sirius is not located in the Sirius sector block, but rather in the neighboring Alpha Trianguli sector block. (STO video game: Star Trek Online)

In the treaty boundary quadrant star chart system, Sirius is located in Quadrant 0. (ST reference: Star Trek Maps)


The Dogon of Mali are believed to have been visited thousands of years ago by aliens from Sirius. In 1940, Benny Russell had a vision where a Dogon encountered one of the aliens who died soon after. (DS9 novelization: Far Beyond the Stars)

The Dogon people are believed to have known of the existence of Sirius and its companion star.

On several occasions in 2364, viewscreen readouts aboard the USS Enterprise-D showed the location of Sirius, in the form of charts from the Enterprise library computer. (TNG episodes: "The Naked Now", "The Last Outpost", "Conspiracy"

The Federation starships USS Sirius were named for this location. (TOS reference: Star Fleet Technical Manual)

Astronomical data

Primary inner system orbits.

Alpha I
Has no atmosphere, and is geologically dead. An asteroid belt separates it from Alpha II.
Alpha II
Has a highly poisonous atmosphere and is very geologically active.
Alpha III
Has 7 moons. Another asteroid belt separates Alpha III from the trojan planet system of Alpha IV and V.
Sirius IV
Gas giant, has 12 moons
Alpha V
Has 29 moons. Alpha IV and V are gas giants that slowly revolve around each others as they orbit the star system.
Sirius IX
Supports an indigenous population.
Centauran colony.



Stars, systems and objects of the Canis Major constellation
Alpha Canis Majoris (Sirius, Alpha Canaris: Sirius AShahr) • Delta Canis Majoris (Wezen, Delta Canaris) • Epsilon Canis Majoris (Adhara, Epsilon Canaris) • Gamma Canis Majoris (Muliphen, Gamma Canaris) • Pi Canis Majoris (Korvat, Pi Canaris)
Alpha Trianguli sector block
Alpha Trianguli
Algira sector Alpha Majoris (Alpha Majoris I) • Sirius system (Sirius A, Shahr: Alpha IAlpha IIAlpha IIISirius IVAlpha VSpringboard) • Lilsis
Almatha sector Almatha system • Aria systemCaralun system • Corwin systemSantos systemTrivas system
Dorvan sector Aokii system • Dorvan system (Dorvan V) • Andoss system • Minas Korva system • Obrom system
Centauran stars and star systems
Centauran home system (Alpha Centauri): Rigil Kentaurus (Alpha Centauri A)Quindar (Alpha Centauri B)Proxima (Alpha Centauri C) Federation icon image. the galaxy's Alpha and Beta Quadrants icon image. Centauran icon image. Centauran icon image.
Alpha Canus Majoris/Alpha CanarisArabennBeta RigaliaEgara 172KolitorIllexLaxes AlphaLeoxaLuris EtaMaven ParsisMegolarMinarcis AlphaMolinusMoxenalusOronessOsirisParsus IndiPillas MinoraPiramPrincipPrincipius MidosQuadrixRidixSestarci 124SingularitySiriusTarletus
Alpha and Beta Quadrant stars and star systems (S)
SaderaSadora RexSahndaraSahqooqSalaynaSalgoraxSalgorax-Neptor systemSamaaraSantoraSanurnaSarsithiaSattenikSaurSavoyScheherazadSeiji MajorSelta AvastamSenteraSerganeSerrisServitrixSestarci 124ShaandraShahkurSheratanSheridanSidianialSifSiftsSigma BaranaSigma BorellaSigma IotiaSigma KinnaSigma systemSigma TamaSigma TherniaSigma ZhukovaSilica TareSilicasaSilivarSilvaSinbadSindariusSingularity systemSinisserSinnawa LotosSinuijiSinuiji systemSirrieSkeevoSkellenSkondardS'mtharzSolarisSoltarisSoranSorenleSpartalSpikalStelam DelethamStillwellStirnisStygianSuah'DronSX ArietisSybaronSymbokovechSynton Alpha and Beta Quadrant icon image.
Alpha Quadrant stars and systems (S) SabikSadatoniSadrSakuraSaltokSalvaSandalSanelarSarin systemSar'kellSeginusSelay systemSepiaSeptimus systemSetlikSeyomSigma Beta 443Sigma Coronae BorealisSigma Cygni 57Sigma DraconisSigma PegasiSigma SerpentisSlaybisSocratiiSolSolarion Alpha Quadrant icon image.
Beta Quadrant stars and systems (S) SaliehSamnarSankraxSecurisShahrShermanShekkis systemSierraSigma CetiSigma GeminorumSigma LibraeSigma PavonisSigma-1014 OrionisSimon-316SiriusSirius ASirius BSkorr systemSomrawSpicaS'sgaron systemSuhailSya Beta Quadrant icon image.
Alpha and Beta Quadrant stars and star systems (A)
AaladAarakAarraAberrizAbraxasAbyss AlphaAccellusAchillonAcibenAdigeonAdonoloAecupusAeonAerieAerimeaAesaAesirAesuriAetisanAexixAfritalisAgbarAgiirratAgricoAhadiAhzdarAiligAinAindiaAitiAkersAlactiAladfarAladsoAlakAlamedusAlannahAlarisAlastorAlatumAlchibahAlcyoneAlderamAlderaminAldhanAlephAlexisianAlfas DucatAlfin-BernardAlfirkAlfrAlgeronAliothAlkaluropsAlkesAlkukAllendonAlmeisanAlnathAlnitakAlonsoAlorinaAlpha AldissAlpha ArietisAlpha AtaruAlpha CorandaAlpha DarwinAlpha Epsilon TauriAlpha EquuleiAlpha HeliosAlpha HonorusAlpha HydrosAlpha KirikiAlpha KratoniiAlpha Marak 272Alpha NarniaAlpha NexusAlpha OmicronAlpha OrionisAlpha OrtelinaAlpha ParnaculonAlpha PerseiAlpha QuarramAlpha SarpeidonAlpha ShiroAlpha SigmaAlpha TauAlpha ThetaAlpha VarangisAlpha VegetisAlpha VergorisAlpha XaridianAlphardAlphaxAlsafiAltamidAltaneaAltanis IdrilonAltarAlterfAlthosAltorAludraAlulaAlyaAlycenAmalAmbrose's StarAmi BeraAmmdonAmonAmpolisAnaxarAndreaAndrocusAnkaaAngosiaAnnobonAnrakAntedeAntiacusAntideAntigoneAntiliosAntipathyAntonehkAntos VeriaApriliaAquila ScorpiArachnaeArakAralanArcadiaArcan-BetaArcanis MajorisArchernarArchibaldArdajiArdanAretianArgentomeaArgonaArhenniusAriannaAridanesAridiaArkabArkenArktoArloffArmusArnabArnebArnebiusArnosArrakisArtaleirhArtemisArvadaAsellusAskalonAsmidiskeAstareaAsteropeAstridaAtaliaAtlasAtriaAtrius'aucdetAugustus GammaAumoide PoreAuvaAX AraeAxelotAyin AlephAyvrenAzati Prime Alpha and Beta Quadrant icon image.
Alpha Quadrant stars and systems (A) AaamazzaraAchirdAdhilAegis AquilaAjirAl NathAlam'ak system (Alam'ak) • AlbireoAlcorAldhibainAlferaz (Alferaz AAlferaz B) • AlgolAlkaidAlmachAlmathaAlpha Andromedae (Alpha Andromedae AAlpha Andromedae B) • Alpha AquariiAlpha AquilaeAlpha AurigaeAlpha BoötisAlpha Canum VenaticorumAlpha Coronae BorealisAlpha CygniAlpha MajorisAlpha OphiuchiAlpha ProximaAlpha TrianguliAlpha Ursae MajorisAlpha-1 AndromedaeAlpha-2 AndromedaeAlpheccaAlpheratzAltairAnchaAndromedaAnkaroAnticaAntosAokiiAquilaArawathArbazanArcturusArduriaArgayaArgusArtelineAscellaAtairAtikAurelia Alpha Quadrant icon image.
Beta Quadrant stars and systems (A) AcamarAchernarAcruxAcubensAdaraAdelphousAdhaferaAdharaAelasAgenaAgornuAgurthaAjilonAkaaliAl NairAldebaranAlgorabAlhenaAlnilamAlpha-2 CentauriAlpha CancriAlpha Canis MinorisAlpha Canis Majoris (Alpha Canis Majoris AAlpha Canis Majoris B) • Alpha CarinaeAlpha Centauri (Alpha Centauri AAlpha Centauri BAlpha Centauri C) • Alpha ChamaeleonisAlpha CirciniAlpha Comae BerenicesAlpha CrucisAlpha CygniAlpha EridaniAlpha GeminorumAlpha GruisAlpha HydriAlpha LeonisAlpha MensaAlpha MonocerotisAlpha OniasAlpha PictorisAlpha PrimeAlpha ScorpiiAlpha VirginisAlpha VolantisAlpha ZetaAlshemalAlungisAmarAmargosaAndoriaAngelAntaresArchanisArcherArgeliusArgelius BAridedAviorAxanarAzhaAzraga Beta Quadrant icon image.


The Chronology depicted Sirius's name and distance from Earth on star chart illustrations, but since it is a "real" star system, modern scientists know a few things about its makeup that weren't in its Star Trek mentions.

It is notable that Sirius was briefly glimpsed onscreen in canon productions of Star Trek because the production staff copied their star charts from the earlier, non-canon Chronology. In close proximity to Earth, Sirius is in the vicinity of sector 006 and is therefore a Beta Quadrant star system, directly on the edge of the Alpha Quadrant. FASA RPG module: The Federation claims this system contains two Class M worlds but doesn't identify the other world.

Star Trek Online suggests that the planet Vulcan is located in the Sirius system. A location at Sirius would be a contradiction of canon since ENT episode: "Home" states it is 16 light-years from Earth. Other sources generally agree the Vulcan system exists around the triple star 40 Eridani.

In modern day astronomical notation, the two stars of Sirius do not have separate names, particularly the secondary's name "Shahr", which appears to have been devised for the Technical Manual.

In TNG video game: Birth of the Federation, the orbital configuration of the game map star systems was randomly generated each time a new game started. In particular, Sirius can exist twice on the same map, once as "Sirius" and again as the "Alpha system".

No history or specifics are established for this location in Starfleet Command III, as its name was arbitrarily selected for a Federation system on the game map by the game software, with random attributes.


External links