Elkan Nine
According to a deleted scene in the  first season episode , Elkan Nine was a starship that approached a trade outpost on Rigel X in 2151. The starship's approach vector was too steep, so the outpost's dockmaster advised the crew of Elkan Nine to raise their approach vector by 0.2 radians. 

This information is featured in both the script and ization of  and is mentioned in a deleted scene released in the ENT Season 1 DVD.
Deleted material