Apollo class
The Apollo-class was a class of Federation starship in operation during the 24th century. 

They were in Starfleet service by the 2320s through the 2370s. (; ) They were used on missions of deep-space exploration. (TNG Season 4, display graphic) The Vulcan National Merchant Fleet and the Maquis also utilized them as freighters and transports. These vessels were partially constructed out of dentarium alloy.

In 2364, a ship of the class, the , received Kosinski's experimental warp drive upgrades, resulting in a measurable increase in performance and engine efficiency. It was later suggested that the enhancement may have been attributed to Kosinski only straightening out simple engine inefficiencies of the old ship. ()

In 2368, fragments from the navigational deflector array of a Vulcan transport of this class were recovered in the Hanolin asteroid belt from a downed Ferengi cargo ship in crates marked "medical supplies". The debris was spread over one hundred square kilometers. After running a molecular pattern trace, the ship was later identified as the . 

That vessel, and two others were later used by the Romulans as a "peace" envoy sent to . These vessels traveled from Romulus and across the Romulan Neutral Zone at warp 1; aboard the three vessels were over two thousand Romulan troops. 

Following the Federation's discovery of the Romulans' true intentions, the invasion of Vulcan, the Romulan force retreated toward the Neutral Zone. Upon an attempted interception by the , a Romulan Warbird destroyed the three Vulcan transports and all the troops on board. ()

In 2372, Starfleet Command ordered the transport of several CFI replicators to Cardassia aboard a Vulcan freighter. It was later determined that the freighter was under Maquis control, and instead used the vessel to divert the replicators to the Demilitarized Zone and into their possession. Michael Eddington left aboard the Vulcan freighter as well, as he left behind his Starfleet career, and to join the Maquis full time. ()

Ships commissioned 
Named
  (NCC-11574)
  (NSP-17938)

Unnamed
 Unnamed Apollo-class starships

Uncertain
 Odin
  
  (NCC-30000)
  (NCC-12537)

Appendices

Background information 

The Apollo-class name has appeared on screen only in a Starship mission status chart in . In the . the Vulcan spacecraft , a ship mentioned in "Unification I", was identified as a member of the Apollo-class. In an internal ship list, dated to September 26, 1990, the freighter Odin, with the registry of NGL-12535, was identified as a member of the Apollo-class.  

The , as well, identified one of the starships lost at Wolf 359 as the , an Apollo-class starship, with the registry of NCC-11672. The ship was only mentioned in a scene cut from the aired episode . In the scene the Gage was ordered to attack the Borg cube with the  and the . 

The  stated this class of starship was "named for the sun god in Earth's Greek mythology, as well as for the spacecraft that first carried Humans to the moon." 

The Apollo-class, according to Rick Sternbach who designed the T'Pau, was equipped with a conjectural type of warp drive called the annular warp drive by the . Instead of conventional nacelles, a ship equipped with this drive would have a large hoop-shaped field generator.

For more information on history of this studio model, please see: Apollo-class.

According to Issue #141 of the Star Trek: The Official Starships Collection, the Apollo class starship was approximately 470 meters in length and had a maximum speed of warp factor 9.6. The class could accommodate around 650 people. It was equipped with particle beam weapons and graviton-based deflector shields.

Apocrypha 
According to Star Trek: Customizable Card Game pack Q-Continuum, the T'Pau was a ship of the Merchant-class.

In apocryphal materials, there were several classes of Federation starships with the name Apollo-class:
 In The Price of Freedom sourcebook of the Last Unicorn role playing game, a class of light cruisers with a similar hull configuration to the  is identified as Apollo-class. They are 315 meters long and have sixteen decks. The class was in production between 2325 and 2358. 
 In later Last Unicorn supplements, the Vulcan T'Pau is also identified as the Apollo-class, with five decks and a length of 148 meters.
 In the video game Star Trek: Legacy, a class of ships similar to the refit-, but with a nacelle above and below the primary hull and no secondary hull, is identified as  scout ships.

External link 
 

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Federation starship classes
Vulcan starship classes