OK, so it's an imaginary Trek ship (OK,OK, an imaginary, imaginary Trek ship). Perhaps it's the first non-Starfleet, Starfleet ship? Without further ado...
Your best source of reference material is the book, Star Trek: Action by Terry Erdmann. From the diagrams in the book, I estimate the ship to be 161m long, 30m in draught, and 73m across the beam.
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