40 Eridani A 40 Eridani A was a star in the Vulcan system . This system was located in Sector 001 , a region of space in the Alpha Quadrant . The Federation established the 40 Eridani A Starfleet Construction Yards in this system . In the 24th century , these yards commissioned the starship s , , and . ( , " set decoration " , ; " dedication plaque s " ) Appendices . Background information . It was not canon ically established that 40 Eridani A is the location of , until a draft of Geoffrey Mandel ' s book " " was used in various ENT episodes which shows the location of " " Vulcan ( 40 Eridani A ) . " " A picture of a star chart supposedly used for was tweeted by Ted Sullivan on 28 November 2017 . According to this map , the star Vulcan was also known as 40 Eridani A . Previously it has been a popular piece of information throughout licensed works and fandom . The reference has worked its way into a number of background graphics and art work , for example , the dedication plaque s listing the fleet construction shipyard s there . References to this star system as Vulcan ' s date back to James Blish ' s adaptation of in the book " Star Trek 2 , " as well as a mention in the " Star Fleet Technical Manual " which Franz Joseph researched and compiled . On - screen statements of Vulcan being 16 light years away from Earth in and also support 40 Eridani A as the location of Vulcan . The stated that Vulcan orbited the dwarf star 40 Eridani A , which is described as the brightest star of a triple star system . In 1991 , " Star Trek " creator Gene Roddenberry , along with three scientists from the Harvard - Smithsonian Center for Astrophysics , endorsed 40 Eridani A as Vulcan ' s primary ( rather than Epsilon Eridani , which is occasionally misidentified as Vulcan ' s primary ) stating , in part : " We prefer the identification of 40 Eridani as Vulcan ' s sun because of what we have learned about both stars at Mount Wilson . . . based on the history of life on Earth , life on any planet around Epsilon Eridani would not have had time to evolve beyond the level of bacteria . On the other hand , an intelligent civilization could have evolved over the aeons on a planet circling 40 Eridani . So the latter is the more likely Vulcan sun . " The " Star Fleet Medical Reference Manual " also references the Vulcan species as " " Homo eridani . " " According to " , " ( pp . 18 , 19 , 36 , 45 , 58 , and , 60 ) , the 40 Eridani ( Omicron 2 Ceti ) system was a trinary star system , with an orbital period of 248 years , located in the Vulcan sector ( Sector 005 ) , in the Beta Quadrant . According to " " ( " Stellar Cartography " pp . 14 - 15 , 17 , 22 - 24 , 34 , 36 , and 46 ; " The Dominion War : Strategy and Battles , 2373 - 75 " ) , the 40 Eridani system was known to the Vulcans as Nevasi . This system was located in the Beta Quadrant . The primary star , 40 Eridani A ( Nevasi A ) , was class K . The innermost planet was a rocky class B planet named Ket - Cheleb . Vulcan ( T ' Khasi ) was in a co - orbital relationship with the class G planet T ' Khut ( " the Watcher " ) , which had one moon named T ' Rukhemai ( " the Eye of the Watcher " ) . The icy planetoid Delta Vega was located in the outer asteroid belt . The two companions of 40 Eridani A , 40 Eridani B ( Nevasi B ) , and 40 Eridani C ( Nevasi C ) , were a white class A4 dwarf and a red flare class M4 dwarf , respectively . In the 2150s , this system was in the Earth Trading / Exploration Region . This system was threatened by the Dominion after they occupied Benzar in 2375 .