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Theta Cygni (13 Cygni) is a star system, a trinary star visible from Earth in the constellation of Cygnus. There were at least twelve planets in the system, at least one of which had borne sapient life. (TOS episode: "Operation -- Annihilate!")

History and specifics[]

At some point between 2067 and 2165, blastoneuron neural parasites infected the population of twelfth planet Theta Cygni XII, causing the inhabitants to go extinct. (TOS episode: "Operation -- Annihilate!")

In 2165 a Tellarite freighter reported receiving a distress call from Theta Cygni XII. Starfleet dispatched the USS Essex to investigate. Captain Bryce Shumar reported to Admiral Jonathan Archer that the Essex had found all life on the planet had been destroyed by chemical and bacteriological warfare some time ago. Shumar informed Archer that as far as the Essex could determine the planet had suffered a wave of mass insanity, and that a number of ships had been launched prior to the destruction of all life on that world. Because Theta Cygni burned hot the crew did not have a reliable means of tracking where the ships had gone due to the interference generated by the star. (ENT - Rise of the Federation novel: Live by the Code)

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Stars, systems and objects of the Cygnus constellation
16 Cygni61 Cygni (Tellar)Alpha Cygni (Deneb)Beta Cygni (Albireo; Cygnia Minor) • Cygnus ReachDelta Cygni (Delta Cygnus) • Gamma Cygnet region (Gamma Cygnet planetoidGamma Cygni (Sadr, 37 Cygni)Tree of Life planetoid) • Cygnus systemEpsilon CygniOmega Cygni (MaluriaCygnet) • Theta CygniVeil NebulaYlva CygniCygnia MirosCygni Ora the galaxy's Alpha Quadrant icon image.
Cygnus system Cygnus system primary star: Cygnus IIICygnus IVCygnus VII
Cygni system Cygni system primary star: Cygni ICygni IICygni III
Alpha and Beta Quadrant stars and star systems (T)
TabukTagusTahniva 311TajarhiTakanTakanarraTakoiTak'vorTaladiTalarTaldoraTalbotTalgatTaliTal'Ihnor GatesTalinTalithaTallusTalnaTalonTaloraTalquosTamarosTamborTamporaTanarTanarisTaniaTandorianTantalusTantamonTanugaTaojiTaosTaranTaranaTarandaTardalTareelTarettTarfTariaxTarilaTaris SetiTarletusTarnakTarquoleseTarsusTartanaTartarusTasoxTasusTau BetaTau GammaTau OmegaTau SerpentisTau ZetaTaureanTauro-34TautallusTauteeTaxakTaygetaTazTaziokTaziorT'BorT'DakkaTe AwamutuTechnisTedaraTejatTekianTekielTek'rethTelcosusTelepTellionTeloraTelumTeluridianTem DaraanTemarisTemaziTemirTenakTenaraTendarTendarriTenekratusTenberTeniiraTenorTera DaraanTera LaraTeranaTeranthTerazon-X31TerbaTerebTerellaTergaTerimTerminimurusTerofTeronTerratinTerrellianTervekTervellionTessmataTesumTeth'torvaTevronTewaTezel-OrokoTezionThabitThalakThaliaThallusThark-MorkolTharnosTharsisThasusThaxiusTheata LeonisThelonii system (Thelonii) • ThetaTheta 116Theta AnterialTheta BowlesTheta CobriniTheta CygniTheta GammaTheta MajorisTheta MarianaTheta MeesTheta PictorisTheta RillTheta TauThetalianThevosTholusThonolanThorian-VThoris AmarnisThranstorThraxThrazThrellviaThrishiaThubanTHX-1138Tia DaraanTiarenTib'vorTibaTibidexTiereniosTifelTiganTikopaiTiliulTimoniumTimorTimoreTimpekTim'pekTio'pekTir KapovTira DaraanTirianTirosTir'taraTitanTitaniasTithadiTizumT'KarT'LaniTlaoliT'lli BetaT'LorTNC-5527TokanTok'BhulTolforTolochonTolorTomanTomb of AnikalistesTomiraTomoraToolianToothy MawTorToradiTorgu-VaToridexTorinTor'ivaraTor'kenTorkorTorobToronaTorrtTortugaTorviirToskaToziuzTozoxTozronT'PorTragerTraklivTra'taraTrab'nethTrabianTrablarTraboxTramzonTranTraxenTrel DaraanTrelebTrelkisTrendirTrellisane-SealonTrennesTri-BetalineTri-Rho NauticaTriaminusTriangelesTriangularisTriebaT'RillTrillbyTriminonTrimirTrinoraTrin'taraTripoliTro'varaTron DaraanTrotorTruaiTrunoxTruth's BaneTruxtunTseenTsihTsugh KhaidnnTszeTufemTulanTulganaTunerTurenTurionTuri'taraTur'vokTurulTutakai system (Tutakai) • T'VantTwisting MawTwobinTyburnTychoTyntTyoloTyrelliTyrtaeusTyrus Alpha and Beta Quadrant icon image.
Alpha Quadrant stars and systems (T) TagraTalosTama/TamarTammeronTarahongTarazedTarvoTasakTau CetiTau CygnaTau BoötisTaurusTegedaarTellarTemeckliaThalosTherbiaTheta AquariiTheta DraconisTheta PegasiTL-9139TohvunTomedTopinTormanTorrosTrelkaTriangulumTrillTrivasTylTyra Alpha Quadrant icon image.
Beta Quadrant stars and systems (T) T'AcogTalvathTarodTau CentauriTau DeltaTau LacertaeTegmeniTellunTeneebiaTephreiTerixTessenTeutilT'ghaThalassaThallonTheta CentauriTheta EridaniTheta HydraeTheta IndiTheta KiokisTheta LeonisTheta PavonisTiburonTigelisTikaT'MetToh'kahtT'ongToredarTorekTornaToronTraelusTranome SarTrilithTurkanaTy'Gokor Beta Quadrant icon image.

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