The USS Bessel (NCC-3911) was Federation starship, a Ptolemy-class transport tug authorized for construction in Starfleet service in the 23rd century. (TOS reference: Star Fleet Technical Manual)

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Ptolemy-class starships
Ptolemy-subclass Al RashidAnaxagorasAnaximanderAristarchusCopernicusEratosthenesGalileiHeveliusHipparchusIbn DaudMasadaPhilolausPtolemyPythagorasThalesUlugh Beg UFP emblem image. Seal of the Federation Starfleet.
Keppler-subclass AmbartsumianBraheCassiniDeslandresDonatiFlamarionKepplerKidinnuLeverrierLuytenMessierNewtonPiazziRiccioliSchiaparelli
Doppler-subclass AiryApianBaadeBayerBielaBondiBrouwerCampellCarringtonChamberlainChauvenetClarkColumboDollfusDopplerDreyerEddingtonEnckeFracastorGalleGaillotGautierGoldrickeHaleHalleyHayashiHenckeHerschellHirayamiHoldenHubbardHubbleHumansonJanskyJeffreyKaulaKlepstraKrugerKuiperLaplaceLeavittLockyerMitchellNewcombOortPalitzschPealePickeringPopperPritchettReberRittenhouseRossSabineSchmidtTombaughToscanelliVan De KampVogelVon ZachWalkerWolastonWright
Dollond-subclass AdamsBaumBesselBodeCarpenterChallisChandrasekherDelambreDollondEichelbergerFlamsteedFrostGoldGoldreichHallHendersonHertzsprungHoyleHugginsIrwinJeansKohlschutterLagrangeLowellLangleyMoultonOlbersPiercePlaskettPogsonRoquesRussellSandageSchwabeShapleySlipherSavaryScheinerSecchiShklovskyStruveSwiftToddVan de HulstVan MaanenWolfYoung

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