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The Cicada sector, also known as Sector 4423, is a sector of space in the galaxy's Alpha or Beta Quadrants. It was rumored to be a region where starships would disappear, never to be heard from again.

This sector was named after cicadas, a type of Earth insect. (TOS - Log Two novelization: The Lorelei Signal)


In the early 22nd century, the sector was charted by the Federation, but only partially explored. It has not been regularly visited.

In the 2260s, James T. Kirk was familiar with rumors associated with the sector.

In 2269, researchers at the Starfleet Science Center on Rifton compiled sets of data recently received from the Klingon Empire and Romulan Star Empire regarding this sector. (TOS - Log Two novelization: The Lorelei Signal)

Records revealed that one ship was lost in the sector every 27.344 star years: c. 2133, c. 2160, c. 2187, 2215, and 2242. (TOS episode & Log Two novelization: The Lorelei Signal)

Shortly before the next predicted event in 2269, the USS Enterprise was passing close to the sector while escorting a convoy of ore freighters. The starship was assigned to enter the sector and investigate. (TOS - Log Two novelization: The Lorelei Signal)

The sector was named in the novelization.



  • Taurean




sectors of the galaxy
sector blocks and their major sectors Alpha Centauri (TeneebiaSierraVendor) • Alpha Trianguli (AlgiraAlmathaDorvan) • Beta Ursae (BajorCardassiaKalandra) • Eta EridaniGamma OrionisIota PavonisOmega Leonis‎OrelliusPi CanisPsi VelorumRegulusSirius‎Tau Dewa‎TekaraVyntadiZeta Andromedae Galaxy diagram image.
other named sectors AjmanAkiganelAldebaranAllicarAlpha 19Alpha CentauriAlsuranAncharAndorAnsterraAntaresAntedianArchimedesArawathArgosianArgusAriasBellatrixBelotiBeneciaBeta NiobeBeTauB'MothBolarusBoswelliaCabralCambornCampanCanopisCarrayaCelesCicadaDalmineDashaDelta VegaDenobulanDevronEerina VEliasEpsilon IXEpsilon QuinonezEpsilon Z-3Epsilon-485FoxtrotFries-PosnikoffG-5G17GallowayGameraGamma HydraGamma TrianguliGandGarimanGavariaGlesseneGlintaraGouramiGrewlerGuravaH-100HekarasHorusHromiHyralanIgoJaradanKalebKandariKavis AlphaKavrotLaganaLan'TuanaLeughonLidaraMagellanMalfabricanMarkomenMarkoniaMariotianMarrabMaxiaMekordaMinaraMoabMobiaMoranMurasakiOmegaOmicalOneamisuOphiucusParveniumPerseusPodarisProcyonQav'loSQuebecRakhariRedRegulusReydovanRhomboid Dronegar 006Rhymus MajorRomeoRukaniRutharianSamnarSargassoScyllaSelaySelcundi DremaSigma DraconisSigma-485SikarianSilarianSolTakaraTalarTangoTarodTauganTellarTerra NovaThanatosTharkianThetaTiberTintagelTrexelian 001Trexelian 002Trexelian 003Trexelian 004Trexelian 005Trexelian 006Trexelian 007Trexelian 008Trexelian 009Trexelian 010Trexelian 011TriangleTrillTyphonUmaniVandenVaskanVegaVega 6Vega-OmicronVenturiusVestaVrungVulcanV'varianWinduWodenWumparXarantineYontasaYurokZed LapisZhirrZ-6Zytchin
numbered sectors 00100200300400500600700800901012-J14C16C01818J01921C02323-D23-H02427F02829G030031032034038038G39J040047B054054R061063068H078079F90.4097108109G116T119D130134142145179204E213219A220B220A221-G221-H262275283396401418D4414-70492500507743-D861875902949104511561385150916071608160921582520355636413658442319658211662118521290213052139621399214592150321505215272153821602218032183421835219472203622055220932213922309223582240225712227572284622849228532285822956230792309425013367643762841751417524175364238