Starbase 47
Starbase 47 was a Federation  starbase administered by Starfleet. It was located near Halka in the Alpha Quadrant, and had been in service since at least the mid-23rd century. (; )

In 2259, the location of this starbase was labeled on a stellar cartography chart that was seen on the 's ready room viewscreen. ()

In an alternate quantum reality visited by Worf in 2370, Starbase 47 was the object of covert surveillance by the Cardassian Union, who had reprogrammed the Argus Array to observe this, as well as Deep Space 5, the Iadara colony and the Utopia Planitia Fleet Yards. ()

In 2399, the location of Starbase 47 was labeled in a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. The base was located in or near to Federation space. () 

In 3189, the location of Starbase 47 was denoted on a holographic star chart  of the galaxy at Federation Headquarters. ()

Appendices

Background information 
Starbase 47 was also originally listed in an okudagram in the episode . The name of the base did not appear in the remastered episode version of the database. According to the commercial transport database graphic in the original episode, in 2328, David Trotti boarded a transport ship at Gamma Towles II bound for Starbase 47.

Apocrypha 

A different Starbase 47 was featured in the Star Trek: Vanguard series of s. However, following the events of that series, that station was destroyed and disavowed in Federation records. The designation was covertly reassigned to the starbase referenced in "Parallels". The remastered version of Starbase 6 was later inspired by this version of Starbase 47.

Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385") located this original Starbase 47 in the Alpha Quadrant. The base was operational from 2265 to 2268.

External link 
 

bg:Звездна база 47
de:Sternenbasis 47
es:Base Estelar 47
nl:Sterrenbasis 47
0047, Starbase
Starbase 0047