In late
2366/early
2367 the Borg sent a
Borg Cube towards Earth, headed by spokesdrone
Locutus. They were met by the
NCC-1701-D commanded by
William T. Riker but defeated the 1701-D easily, then proceeded on towards
Earth.
The United Federation of Planets met the Borg at Wolf 359 with 39 ships, plus two Klingon battleships.
The NCC-1701-D arrived at Wolf 359 towards the end of the battle and managed to retrieve Captain Picard and defeat the Borg. A total of fifteen Federation starships were destroyed, including the USS Saratoga.
In Real Life it's the fifth closest star to the Sol system, approximately 8.1 light years away. It's an M8 star.
Looks like it may now be the sixth closest: http://www.smh.com.au/articles/2003/05/22/1053585646997.html