Epsilon Ionis is a binary star system, located about 30 light-years from the Kyr system, consisting of a star with a black hole in a highly elliptical orbit. The primary star had just gone nova not too long before a point in the 2260s when the USS Enterprise was nearby at Kyros, causing an intense wave of radiation to close in on that position. The radiation was picked up by the black hole, from the nova star, as energy in a gravitational field. Because of the fast motion of the black hole as it approached the perihelion in its ellipse motion, a slingshot effect occurred, propelling parts of a radiation field at warp 10 in the direction of Enterprise. (TOS novel: Spock, Messiah!)

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Alpha and Beta Quadrant stars and star systems (E)
Ebion • Ebor Tor • Eclosionatu's Depths • Edara • Edela • Ederlyn's End • Edjara • Edmora • Edora • Edrin • Edris • Edvaran • Egara 172 • Eisenhower • Eivox • Eizeb • Ekinus • Ekkoran • El Adrel • Elamin • Elamra • Elba • Eldara • Electri • Elex • Elgard • Elkauron • Ellion • Ellison's Star • Elnon • Elohim • Elona • Elsk'veth • Elthan • Elvada • Elven • Elvros • Elysia Incendae • Elzan • Elzbar • Elzibar • Emben • Emila • Eminiar • Emkaid • Emmeline's Gate • Emrana • Em'vara • Emvatra • Endicor • Endless Maw • Endra • Enkoth • Enoch • Enori • Enra • Entera • Entrunar • Eofaran • Eojur • Ephrata • Epsilon 119 • Epsilon Anubis (Epsilon Anubis A • Epsilon Anubis B) • Epsilon Ballara • Epsilon Beta • Epsilon Ceti • Epsilon Delta • Epsilon Fornacis • Epsilon Ionis • Epsilon Kitaj • Epsilon Lyra • Epsilon Minora • Epsilon Miranda • Epsilon Sierra • Epsilon Sorona • Epsilon Tauri • Epsilon Theta • Epsilon Ursae Majoris • Epsion • Equess • Eramor • Ercola • Erdor • Ereb • Erela Daraan • Eremar • Ergol • Erivek • Erkia • Er'vadi • Ervik • Esabl • Escor • Esinda • Eskiis • Essai • Ess'vara • Estasi • Esto • Estrada • Estron • Estrona Daraan • Eta Seratorn • Eta Tauri • Eta Trianguli • Eth'bernek • Eth'daja • Eth'fera • Eth'kaba • Eth'kina • Eth'mola • Eth'silva • Eth'teo • Eth'vara • Etla • Evadex • Evara • Evek • Excalbia • Exona Daraan • Exor • Eye of Gabriel • Eye of Helia • Ezani
Alpha Quadrant stars and systems (E)	Edasich • El Nath • Elasi Prime • Eltanin • Ennar • Entelior • Epsilon Aurigae • Epsilon Boötis • Epsilon Cygni • Epsilon Draconis • Epsilon Ophiuchi • Epsilon Serpentis • Eta Cassiopeiae • Eta Coronae Borealis • Eta Draconis • Eta Lyrae • Eta Ophiuchi • Eta Serpentis • Eta Ursae Majoris • Exo • Eye of Ket-Cheleb
Beta Quadrant stars and systems (E)	Eden • Edinov • Eisn • Ejul Thelni • Epsilon • Epsilon Canaris • Epsilon Canis Majoris • Edren • Epsilon Carinae • Epsilon Corvi • Epsilon Eridani • Epsilon Geminorum • Epsilon Gruis • Epsilon Hydrae • Epsilon Indi (Andoria) • Epsilon Librae • Epsilon Monocerotis • Epsilon Orionis • Epsilon Pavonis • Epsilon Phoenicis • Epsilon Scorpii • Epsilon Virginis • Eta Antliae • Eta Canaris / Eta Canis Majoris • Eta Corvi • Eta Crucis • Eta Eridani • Eta Horologii • Eta Indi • Eta Lupi • Eta Scorpii • Eta Virginis • Eye of Grun