USS Melbourne (Nebula class)
The USS Melbourne (NCC-62043) was the name and registry number given to a  Federation starship that was seen destroyed in the Battle of Wolf 359.  The wreck model was seen in both the   season four episode  and the   pilot episode . It has the distinction of being the only studio model, besides the Borg cube, present in both depictions of the Battle of Wolf 359 and its aftermath. Footage of the wreck model was reused to represent another wreck at the Surplus Depot Z15 in the  The Next Generation fifth season episode, . 

In "Emissary", the name  (NCC-62043) was given to an  starship. The name and registry on this Nebula-class model was not legible on screen in any of the episodes. It was not until the  was published in  that it was revealed that "there were actually two Starships Melbourne [...] the first was a Nebula-class model, barely glimpsed as a wrecked hulk in the spaceship graveyard from "The Best of Both Worlds, Part II" (TNG). When the scene was redone three years later in "Emissary" (DS9), a decision was made to instead use the more detailed  model originally built for Star Trek III. Both models were given the same Starfleet registry number but since the Excelsior version was seen fairly clearly on screen, and the Nebula version was not seen well, we now assume that the Melbourne "really" was an Excelsior-class ship." Other than this comment, the Nebula-class ship is not mentioned in the Star Trek Encyclopedia.

In a later interview, Michael Okuda revealed that "Ed [Miarecki] made us two nearly-identical Melbourne models. I destroyed one of them to create a battle-damaged ship for BOBW2. Rick Sternbach helped with the battle damage, too. And Greg Jein contributed quite a bit of wreckage as well. The other Nebula model ended up on one of the side tables in Sisko's office in DS9. I think it was labeled "Melbourne", too."   This second Nebula-class USS Melbourne model was seen as a desktop display model in The Next Generation episodes  and . It later re-appeared as a desktop display model in several Deep Space Nine episodes, most prominently in  and .

Apocrypha 
The apocryphal TNG short story "Trust Yourself When All Men Doubt You" in The Sky's the Limit established that the Nebula-class Melbourne was in fact under construction and intended to replace the Excelsior-class Melbourne. The Nebula-class Melbourne was the ship offered to Commander Riker. The Nebula-class Melbourne was launched early when the Borg attacked, and both ships were lost at Wolf 359.

External links 
 
 

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Melbourne, USS