Saturn Probe Mission.
In "Tomorrow is Yesterday" (TOS 121) we learn that Colonel Shaun Geoffrey Christopher will command Earth's first manned mission to Saturn... And that's about all we learn. If we digabout in a few non-canon sources we get a bit more info, but it's still vague.
We can guess the date is about 40 years after the Ep, so now-ish. In fact "Star Trek Chronology" put it in 2009, though "Spaceflight Chronology" says 2020 (unlikely, given how old Colonel Christopher would be by then... Yeah I know 50ish isn't that much older than 40ish, I'm just going with my gut on that) The ship is the "Aventeur class" UNSS Lewis and Clark.
As the DY-100 series is the space shuttle of it's day, this (I guess) is the "Discovery" of ST's alternate history.
Here's what stats I can find for it.
Length: 125 m
Beam: 28.5 m
Draught: 28.5 m
Mass: 2.81 million kg (2810 tons)
Compliment:
Officers: 3 (Captain, First Mate, Engineer)
Crew: 12
Passengers: 94
Total Capacity: 109
Propulsion
6 Amjet-II Fission rockets
1 Emergency LH2/LO2 rocket in the detachable primary life support module
Performace
Sustainable Acceleration: 0.2 g
Maximum Thrust: 135,000 kg per fission engine
Cruising velocity: 700,550 km/hr
Standard range: 150 million km (Earth-Mars)
Maximum range: 2.57 million km (Earth-Saturn)
Duration: 288 days @ a crew of 15
So, does this fit into Trek? Does it need tweeking? Opinions?
"Star Trekkin' across the universe, On the Starship Enterprise, Under Captain Kirk.
Star Trekkin' across the universe, Boldly going forward 'cause we can't find reverse."
Star Trekkin' by The Firm.