So the problem you have is two unidentified
Constellations of the six on your listing, is that right? The unidentified ships could be, if I understand your methods correctly... hm.
Well,
Challorn, which was definitely active in 2301 as Michel Thuir's command that discovered the Ulith III Biophage on the world of that name. Any of
Kearsarge, Sappho, and
Seleya could be the sixth
Constellation.
Based on the
first introduction of the USS
Sappho,
and the conclusion of that piece by IronWolf... It would be reasonable to infer that
Sappho was commissioned some time after the Biophage crisis, since we know much of the crew were Biophage veterans, even though as far as I can tell the ship herself did not participate in the Biophage crisis. However, she must have been completed during or prior to 2306, as the first overt mention of the
Sappho was in the 2307Q1 captain's log.
Alright, let's resolve this. *puts on ridiculous detective hat*
First mentions of Constellation ship names:
USS
Selaya: 2306.Q1 To Boldly Go:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 173
- The Rock Whisperers's former command!!!
USS
Vigour: 2306.Q2 Captain's Log:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 200
USS
Stalwart: 2303.Q1 Captain's Log:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 39
USS
Challorn: 2301.Q3 Captain's Log:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 11
USS
Docana: 2302.Q4 Rat Race:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 31
USS
Kearsage*: 2301.Q1 To Seek Out New Life:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 2
- Yes, the historical name is supposed to be "Kearsarge". Heck even memory-alpha lists a Challenger-class Kearsarge. But apparently in the TBG universe, the mountain that these ships were named after was called "Kearsage". *shrug*
USS
Sappho: 2307.Q1 Captain's Log:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 273
USS
Polaris: 2303.Q4.M2 Biophage Crisis:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 69
2307.Q1-commissioned Constellation: 2307.Q1 Shipyard Ops:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 259
- Only noted as NCC-1808
- Iron Wolf begging to name the just-launched NCC-1808 as Sappho:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 269
So USS
Sappho is the 2307-commissioned Constellation with registry number NCC-1808?
Now the NCC registry numbers:
2308.Q1: NCC Registry Log established:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 337
First mentions of the NCC registry numbers for all the Starfleet Constellations except the earlier mentioned NCC-1308: 2310 Ghost & Whispers crisis's status page:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 568
USS
Selaya, Constellation, NCC-1803
USS
Vigour, Constellation, NCC-1804
USS
Stalwart, Constellation, NCC-1807
USS
Challorn, Constellation, NCC-1809
USS
Docana, Constellation, NCC-1810
USS
Kearsage, Constellation, NCC-1811
USS
Sappho, Constellation, NCC-1812
Very notably, both NCC-1308 and USS
Polaris are not mentioned here! And USS
Sappho, which presumably should be NCC-1808, has registry number NCC-1812 here!
And just to confirm, the
Sappho still has registry number NCC-1812: 2314.Q1 Shipyard Ops:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 1364
Now the first mention of NCC-1813, attached to what else but the
Polaris:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 361
"We have confirmed that the USS Polaris (NCC-1813) has been destroyed in the Action of 22809 against hostile ships of the Dawiar in the Oriolis System with the loss of 83 crew."
BUT the 2312.Q1 registry log update contradicts this:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 887
"NCC-18xx - Constellations
-1813-1814 UESPA; 1815-1817 Vulcan; 1818-1820 Andor; 1821-1823 Tellar"
Meaning that not only is NCC-1813 supposed to assigned to an UESPA Constellation, none of the other missing Constellation registry numbers below NCC-1812, such as NCC-1802 or NCC-1805, are reserved for the member fleets.
Indeed, NCC-1813 is specifically identified just two years later: 2314.Q3 Licori Council Session:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 1591
UES Jupiter, Constellation-class, NCC-1813
Oddly enough, UESPA seems to have 3 Constellation names, despite only have 2 Constellations:
UES
Jupiter, as noted above
UES
Luna:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 615
- As this is at Vega, where UESPA only has 1 Constellation and 1 Centaur-A here:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 568
- The
Yorkshire mentioned in this update is the Centaur-A, so
Luna must be the Constellation.
UES
Venus:
Sci-Fi - To Boldly Go... (a Starfleet quest) | Page 771
- Never mentioned explicitly to be a Constellation, but the name of it follows same pattern (celestial bodies in Sol system).
- So it could be possible that the UES
Venus is actually a Miranda, despite the name. And hey, there's a tiny city called
Venus in Texas, that could have grown to be a major or historically important city by the 24th century!
All and all...
So here's my theory:
The USS
Sappho is the 2307-commissioned Constellation. Her current registry number is NCC-1812.
The NCC registry was undergoing a process of revamp after the ratification of Amarkia. There was a "beta" version of it available in 2307, and when the
Sappho was launched, it was assigned the preliminary registry number of NCC-1808. The USS
Polaris for whatever reason was assigned registry number NCC-1813.
A year later, the NCC registry is finalized. The accountants realized that the 2307 beta registry didn't make room for earlier ships that are presumably destroyed or decommissioned before 2301, and the wanted to order all Starfleet ships by commission date. So they assigned final registry number of NCC-1812 to the
Sappho.
But during this whole process, the
Polaris is destroyed in the same quarter the registry is being finalized. In all the confusion, the after-action report mistakenly identifies
Polaris as its old registry number of NCC-1813, when that registry number is now allocated to an existing UESPA Constellation (and hey,
Jupiter and
Polaris are both celestial bodies, right?
). The
Polaris would've been given a NCC registry number according to its commission order (so one of NCC-1802, NCC-1805, NCC-1806, or NCC-1808, depending on when it was commissioned, but definitely before
Sappho, NCC-1812). But as the ship was destroyed, we never got to see its actual registry number.
Registry numbers for the first two Centaurs are kinda weird. Prototype ships should get the number NX-***1. But instead, USS Yukikaze got NCC-2101, which means USS Centaur is NX-2102? NCC-2102? And also, either both were built as prototypes or a prototype wasn't built for the class...
My headcanon, which I think I've heard from someone else before:
There
was a NX-2100, the prototype for the Centaur class. It unfortunately had a not-so-great life.
You see, it wasn't just the Centaur that was being designed and prototyped the 2290s. There was also the
Ares project. Now the Ares project was just an unfolding disaster, and Admiral Rogers was eager to get it out the door ASAP in whatever technically functional state. As the Council put more and more pressure on Rogers to explain what the hell was going on with this "cost-efficient explorer" project, in their desperation, Starfleet shifted resources from the nearly complete Centaur project to the Ares project.
That in turn did not bode well for the quality assurance of USS
Centaur, NX-2100. And so, when the NX-2100 was starting its trial runs, let's just say that bad things™ happened, and the
Centaur ended up being broken down for parts to start construction anew without the fatal flaws that plagued the prototype. At this point, the Starfleet engineers were confident they had a handle on the design - in fact, they already were starting preliminary plans for a quick post-launch refit that ended up happening in 2306. So they started building two Centaur-class ships at once. The original
Centaur did technically launch, but it was never commissioned for service, so why not reuse that name?
That USS
Centaur ended up with registry number NCC-2102 rather than NCC-2101 was just a side effect of the 2308 NCC registry revamp, which strictly ordered the registry numbers of Starfleet ships by commission date. Of the two Centaur-class ships under construction, the hull of USS
Centaur may have been laid down first, and it may have been named first before her launch, but slight technical difficulties delayed its commission date until after the USS
Yukikaze.
Indeed, it's because the
Yukikaze was commissioned first that all subsequent Starfleet Centaur-class ships ended up having names patterned after "Yukikaze" - all wintery or windy names.