Captain X said:
They are until contradicted by something else.
No.
The only things that are canonical are:
All shows and movies broadcast by the company who owns Star Trek BESIDES the animated series.
And anything Gene Roddenberry explicitly hailed as canonical.
I believe "The Making of Star Trek" book is true canon, because of something Gene said about it being "official" information. Where's Therin of Andor when you need him?
The ship in the intro of Enterprise will F O R E V E R be a mystery ship with an U N K N O W N name or designation, until otherwise stated on screen. PERIOD.