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The USS Doppler (NCC-3831) was a Ptolemy-class Federation starship in service in the 23rd century. (ST reference: Star Fleet Technical Manual)

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