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Arhennius was a star in or near Federation space, and the center of the Arhennius system. The Arhennius star was a quarter more massive than Sol, with twice the energy output. The star system here had no habitable planets.

The Arhennius system had been scanned by Federation sensors nearly a parsec away, and by passing ships, looking for lifesigns and habitable worlds, but there were neither; the system contained two gas giant planets roughly the size of Saturn and two small rocky planets slightly smaller than Venus without atmosphere. There was no record of any Federation, Romulan, or Klingon vessel ever entering the system. No large explosions had been recorded, but there was evidence of a half-dozen low-yield photon torpedoes detonating near the end of the 22nd century.

The innermost planet contained amounts of dilithium ore in quantities too small or deep to be detected at long range.

Andor was the Federation world closest to Arhennius along a direct route between the star and Earth.

In 2370, retired Starfleet Captain Montgomery Scott obtained a Klingon bird-of-prey and planned to travel back in time and rescue James T. Kirk from the USS Enterprise-B and save him from apparent death, and used the Arhennius star to slingshot back in time, with the USS Enterprise-D following.

In an alternate timeline where Scott succeeded in rescuing Kirk before he could be absorbed into the Nexus, the USS Enterprise-D found evidence of a Klingon mining operation that had been abandoned at roughly the same time as the recorded torpedo detonation. The Klingons also mined the system with interphase cloaked torpedoes, one of which caught the Enterprise-D off guard. (ST novel: Engines of Destiny)

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Alpha and Beta Quadrant stars and star systems (A)
AaamazzaraAaladAarraAberrizAbraxasAbyss AlphaAccellusAdigeonAdonoloAegis AquilaAesaAexixAhzdarAinAkersAladfarAladsoAlamedusAlbireoAlchibahAlderamAlderaminAldhanAlephAlexisianAlfas DucatAlfin-BernardAlfirkAlfrAlgeronAliothAlkaluropsAlkesAllendonAlmeisanAlnitakAlpha AldissAlpha ArietisAlpha AtaruAlpha DarwinAlpha Epsilon TauriAlpha HeliosAlpha HonorusAlpha KirikiAlpha KratoniiAlpha Marak 272Alpha NarniaAlpha NexusAlpha OmicronAlpha OrionisAlpha OrtelinaAlpha PerseiAlpha ShiroAlpha SigmaAlpha ThetaAlpha VarangisAlpha VegetisAlpha VergorisAlpha XaridianAlphardAlphaxAlsafiAltanis IdrilonAltar systemAlterfAlthosAludraAlulaAlyaAmalAmbrose's StarAmmdon systemAmonAmpolisAnaxarAndrocusAnkaaAnnobonAnrakAntedeAntiliosAntipathyApriliaArachnaeArakArcadiaArcanis MajorisArchibaldAretianArgonaArhenniusAridanesArkabArkenArktoArloffArmusArnebArnebiusArrakisArtaleirhArtemis systemArvadaAsellusAsmidiskeAsteropeAtlasAtriaAtriusAumoide PoreAuvaAX AraeAxelotAzati Prime Alphabetasym
Alpha Quadrant stars and systems (A) AchirdAdhilAjirAl NathAlam'ak system (Alam'ak) • AlcorAldhibainAlferaz (Alferaz AAlferaz B) • AlgolAlmachAlmathaAlpha 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 AlphaQuadrant
Beta Quadrant stars and systems (A) AcamarAchernarAcruxAcubensAdaraAdhaferaAdharaAelasAgenaAgornuAgurthaAjilonAl NairAldebaranAlgorabAlhenaAlnilamAlpha-2 CentauriAlpha CancriAlpha Canis Minorisalpha Canis MajorisAlpha CarinaeAlpha Centauri (Alpha Centauri B) Alpha ChamaeleonisAlpha CirciniAlpha Comae BerenicesAlpha CrucisAlpha EridaniAlpha GeminorumAlpha GruisAlpha HydriAlpha LeonisAlpha MensaAlpha MonocerotisAlpha OniasAlpha PictorisAlpha PrimeAlpha ScorpiiAlpha VirginisAlpha VolantisAlpha ZetaAlungisAmarAmargosaAndoriaAngelAntaresArchanisArgeliusAviorAxanar systemAzhaAzraga BetaQuadrant
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