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Tellun was a star system, located at coordinates -5479, -1324, in Federation space in the galaxy's Beta Quadrant, near the border with the Klingon Empire. (ST video game: Fleet Command; ST reference: Star Charts)

History and specifics

Tellun was home to two humanoid civilizations, the Elasians and the Troyians, as well as an Orion Colony. The system was rich in dilithium. (TOS episode: "Elaan of Troyius", FASA RPG - The Orions module: Book of Common Knowledge, Decipher RPG module: Worlds)

Tellun was a binary star system, comprised of an F class yellow giant star and a blue dwarf star. They had a brightness of absolute magnitude −3.

Two of the system's orbiting planets were class M: Elas, the inner second planet; and Troyius, the outer fifth planet. (FASA RPG - The Orions module: Book of Common Knowledge)

The Tellun system contained seven planets in total. (ST reference: Star Trek Maps)

Star Trek Maps states that Troyius is the first planet and Elas is the second planet, but this is in contradiction to the canon fact of the captain's log of "Elaan of Troyius".

In the 2270s decade, the system had class 2 facilities for starship support. (ST reference: Star Trek Maps)


The notorious Orion pirate Half-a-Man Sooris led his massive pirate fleet, the largest in history, in the devastating sacking of the Tellun system on the 19th February, 1894 AD (reference stardate −2/9402.19), which lasted for weeks. The pirates outnumbered the defenders, and many Orion Colony crews mutinied to return and defend their homes. The Orion Colony on Troyius, once one of their most productive worlds, was temporarily abandoned, and over 2.5 million people died, including 1.5 million Orions. Civilization was all but wiped from its surface. (FASA RPG - The Orions modules: Book of Common Knowledge, Book of Deep Knowledge)

In the 22nd century, the Elasians and Troyians both developed interplanetary travel, at approximately the same time. As soon as the two races became aware of one another, relations developed into rivalry and quickly into war. (Decipher RPG module: Worlds)

The complete story of how the war began was still being pieced together by historians and diplomats of the late 23rd century. (FASA RPG - The Orions module: Book of Common Knowledge)

The battles were fought with relatively crude interplanetary spacecraft, lasers and atomic weapons, all in a major interplanetary war for control over the Tellun system. (FASA RPG modules: The Orions: Book of Common Knowledge, The Federation)

The war continued on into the mid-23rd century. Both powers made contact with the Federation in the year 2258, and soon after became Federation members, but continued to skirmish with each other. (Decipher RPG module: Worlds)

By this time, the Troyians had managed to fight the Elasians to a draw. (FASA RPG module: The Federation)

The Carter Winston Group established a medical chemical business in the Tellun system sometime prior to 2267. Doctor Karen Patterson worked for this company until late 2268, when she joined Bendes Kettaract's project to create a stable Omega molecule. (TOS novel: Cloak)

When rich deposits of heavy metals, minerals, and dilithium were discovered on Troyius, it became a world of significant strategic importance. (Decipher RPG modules: Aliens, Worlds)

With that, the Federation wanted to end the conflict between the two planets and volunteered to serve as a mediator in peace talks between the two. Finally, a truce was declared. (FASA RPG modules: The Orions: Book of Common Knowledge, The Federation, Decipher RPG modules: Aliens, Worlds)

However, the Klingons also had an interest in the events in the system and sought to subvert the Federation's efforts.

In 2268, the peace negotiations resulted in an arranged marriage between Cosalthan II of Troyius, and Dohlman Elaan of Elas, in hopes of ending the hostilities. (FASA RPG modules: The Orions: Book of Common Knowledge, The Federation, Decipher RPG module: Worlds)

The starship USS Enterprise was sent to serve as ambassador, aiding peace negotiations and transporting Elaan to Troyius for the marriage. En route to Troyius, the Enterprise was sabotaged and was set upon by a Klingon D7 class battle cruiser. It was during the course of the indecisive battle that the Enterprise crew discovered that the Klingons' true interest in the Tellun system was the Elasian dilithium deposits. Despite Klingon interference, Elasian sabotage and Elaan's reluctance, the mission was successful. (TOS episode: "Elaan of Troyius")

The centuries of war ended with the marriage of the Cosalthan and Elaan; the pair went on to jointly rule both their worlds. (FASA RPG - The Orions module: Book of Common Knowledge)

The admission of Elas into the Federation reduced the Klingon presence within the Tellun system. However, some factions in the Council of Lords still supported an alliance with the Klingon Empire. (FASA RPG - The Orions module: Book of Common Knowledge)

Though Klingons made further attempts to disrupt the peace and gain access to the dilithium deposits, the Tellun system remained stable. (FASA RPG module: The Federation)

Troyius developed into a major dilithium supplier for Starfleet and the Federation. (Decipher RPG module: Worlds)

The peace between Elas and Troyius continued through the late 23rd and 24th centuries, with no significant violations of their treaty. However, renewed warfare remained a topic of great concern for the Federation, especially during the Federation-Cardassian War and the Dominion War, given the risk to Starfleet's dilithium supply. (Decipher RPG module: Worlds)

During the Borg Invasion of 2381, Troyius was threatened, but the SCE crew aboard the USS da Vinci succeeded in making the planet temporarily disappear, thus eluding attack. (ST - Destiny novel: Lost Souls)

Alternate realities

In the Kelvin timeline 23rd century, by the early 2260s, the Tellun vicinity was in neutral space unclaimed by major governments, located at coordinates -5479, -1324. At this point, notable nearby systems included Vinland, Aker, Yridia, Maluria, Takik, Coth, Solusta and the Murasaki 312 effect region. (ST video game: Fleet Command)

The system has an ID code of 90 in the game software and the player is likely to encounter an Orion slaver vessel here.

Mirror universe

In the mirror universe, the ISS Enterprise also participated in the same mission between Elas and Troyius. However, in this reality, Captain Spock negotiated with the Dohlman to gain exclusive access to the dilithium deposits and was able to take control of the Klingon battle cruiser after killing its crew with the use of the Tantalus field. (ST - Mirror Universe novel: The Sorrows of Empire)

System makeup

Tellun system binary star
  • Tellun I
  • Tellun II (Elas)
  • Tellun III
  • Tellun IV
  • Tellun V (Troyius)
  • Tellun VI
  • Tellun VII
The planetary locations of Elas and Troyius were given in the FASA RPG - The Orions module: Book of Common Knowledge.



Tellun star system and vicinity
Tellun binary star system orbit (in Beta Quadrant): Tellun binary star: Tellun I • Tellun II (Elas) • Tellun III • Tellun IV • Tellun V (Troyius) • Tellun VI • Tellun VII Locator logo showing the galaxy's Beta Quadrant. Locator logo showing the galaxy's Alpha and Beta Quadrant.
nearby astronomical objects and systems: AkerCothMaluria (in Beta Quadrant)Murasaki 312 (in Alpha Quadrant)SolustaTakikYridia (in Beta Quadrant)Vinland
Alpha and Beta Quadrant stars and star systems (T)
TabukTagusTajarhiTakanTakanarraTakoiTalgatTaliTalinTalithaTallusTalnaTaloraTalquosTamarosTanarisTaniaTandorianTantalusTaojiTaosTaranTareelTarettTarfTariaxTaris SetiTarletusTarnakTarquoleseTarsusTartarusTasoxTasusTau BetaTau GammaTau OmegaTaureanTauro-34TautallusTauteeTaxakTaygetaTaziokTaziorT'DakkaTe AwamutuTechnisTejatTekianTekielTelcosusTelumTeluridianTemarisTemaziTemirTenakTenaraTendarTendarriTenekratusTenberTera LaraTeranthTerazon-X31TergaTerminimurusTerratinTerrellianTessmataTesumTevronTewaTezel-OrokoTezionThabitThalakThaliaThallusThark-MorkolTharnosTharsisThasusTheata LeonisThelonii system (Thelonii) • ThetaTheta 116Theta BowlesTheta CobriniTheta CygniTheta GammaTheta MajorisTheta MarianaTheta MeesTheta RillTheta TauThetalianThevosTholusThonolanThorian-VThoris AmarnisThranstorThraxThrazThrellviaThubanTHX-1138TiganTikopaiTiliulTimoniumTimorTimoreTir KapovTirianTirosTitanTitaniasTithadiTizumTlaoliTNC-5527TokanTok'BhulTolochonTolorTomanToolianTorTorgu-VaToronaTortugaToziuzTozoxTragerTraklivTrelkisTri-BetalineTri-Rho NauticaTriaminusTriangelesTriangularisTriebaT'RillTrillbyTripoliTruaiTruxtunTseenTsihTsugh KhaidnnTszeTufemTulanTutakai system (Tutakai) • T'VantTyburnTychoTyntTyoloTyraTyrtaeusTyrus Alpha and Beta Quadrant icon image.
Alpha Quadrant stars and systems (T) TagraTalosTama/TamarTammeronTarahongTarazedTarvoTasakTau CetiTau CygnaTau BoötisTaurusTegedaarTellarTemeckliaThalosTherbiaTheta AquariiTheta DraconisTheta PegasiTL-9139TohvunTomedTopinTormanTorrosTrelkaTriangulumTrillTrivasTyl Alpha Quadrant icon image.
Beta Quadrant stars and systems (T) T'acogTalvathTarodTau CentauriTau DeltaTau LacertaeTegmeniTellunTeneebiaTephreiTerixTessenTeutilT'ghaThalassaThallonTheta CentauriTheta EridaniTheta HydraeTheta IndiTheta LeonisTheta PavonisTiburonTigelisTikaT'MetToh'kahtT'ongToredarTorekTornaToronTraelusTranome SarTrilith Beta Quadrant icon image.


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