|Max. warp:||warp 9.2|
|Armaments:||4 Type-VIII phaser arrays|
2 photon torpedo launchers
The Constellation-class exploratory cruiser was in Starfleet service in the 23rd and 24th centuries. A notable feature of the Constellation class was that it was one of the few classes to use a four nacelle configuration.
The Constellation was launched in 2284. (Ship Recognition Manual, Volume 4: Starships of the Original Series Era) Production of the class ceased in the 2350s and Starfleet planned to retire the class fully by the mid-2380s. (Ship Recognition Manual, Volume 1: The Ships of Starfleet)
In one timeline, the prototype vessel was launched in 2299 and disappeared into a wormhole during trials. The Galileo-class starcruisers took its place as front-line exploration vessels. (Starfleet Guides Vol. II: Galileo-Class Starcruiser — Ship's Organization and Regulations Manual)
|Prototype (2270s): USS Constellation - Block I (2276): USS Sempach - USS Speedwell|
|Block II (Early 2280s): USS Hathaway - Block III (2288): USS Tristan - USS Valkyrie|
|Block IV (2290): USS Gettysburg - USS Stargazer - Block V (2292): USS Bradley - USS Chosin - USS Jamestown-B - Block VI (after 2292, but before 2299): USS Magellan|
|Block VII (2301-2304): USS Espero - USS Hathor - USS Helena Harvey - Block VIII (2320): USS Gihlan - USS Victory|
|Star Trek: The Interim Years: USS Investigator - USS Iskenderun - USS Montrose - USS Roebuck - Star Trek: The Prospect Chronicles: USS Artemis - USS Huskie|
|USS Antietam - USS Antares - USS Billings - USS Calgary - USS Ceres - USS Cochise - USS Fading Sun - USS Ferrel - USS Gibraltar - USS Pisces - USS Reliant - USS Tubman - USS Vespucci - USS Windhoek|
- Specifications from the Ship Recognition Manual, Volume 1: The Ships of Starfleet.