Alhena is a real star, not mentioned in the ep, it's script or seeminly anywhere else in canon. It's location near Boreth seemingly originates from the Star Trek: Star Charts.
Boreth was located 12 days by shuttle from where the Enterprise was while en route to the Gariman Sector, as mentioned in the ep. - I'm going to re-add that info. -- Capricorn 09:27, October 21, 2010 (UTC)