The USS Equulus (NCC-603) was a Hermes-class (Monoceros sub-class) deep-space exploration starship in service to Starfleet in the late 23rd and early 24th centuries. (TOS reference: Star Fleet Technical Manual)

Circa 2301, the Equulus encountered a temporal vortex beyond the then-current borders of Federation space. This vortex was four light-years from the planet Rabolum. (NF short story: "Through the Looking Glass")

Hermes-class class I scout starships
Hermes-class AeolusAnubisBatidorBowieBridgerCalypsoCarsonCodyCochiseCrockettDianaHermesQuintillusRevereSacajaweaSpakerTonti UFP seal Starfleet Command logo
Monoceros-subclass AriesCamelopardusCanis MajorCanis MinorEquulusLeoLeo MinorLepusLupusLynxMonocerosPegasusTaurusUrsa MajorUrsa MinorVulpecula
Cygnus-subclass ApusAquilaColumbiaCorvusCygnusGrusPavoPhoenixTucana
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