Y

	U.S.S. Yamaguchi NCC-26510	Ambassador-class
	The Yamaguchi was one of the 39 Federation starships destroyed by the Borg during the battle of Wolf 359. DS9 Emissary. Named after the prefectural capital Yamaguchi, western Honshu, Japan. Name and NCC from studio model (IDIC Page). Class visually identified.

	U.S.S. Yamato NCC-71807	Galaxy-class
	The Yamato was sister ship of the Enterprise-D. TNG Where Silence Has Lease. The Yamato, under the command of Captain Donald Varley, was destroyed in 2365 by an ancient Iconian computer software weapon that caused the failure of the ship's antimatter containment system, resulting in the ship's explosion and the loss of all hands. The software weapon had also been responsible for a series of other malfunctions aboard the Yamato, including the failure of a shuttlebay force field. TNG Contagion. Named after the Japanese World War II battleship. An earlier, incorrect number was given in TNG Where Silence Has Lease, when an illusory version of that ship was seen. An early draft for that episode gave the number NCC-1305-E, which didn't fit into the numbering scheme developed for starships in TNG. Mike Okuda wrote a note to the producers, requesting the number be changed, but didn't send the memo because a later draft of that script dropped the reference to the Yamato's registry number. Okuda wasn't aware that an even-later draft of the script restored the scene and the incorrect number. The dedication plaque bore a quote of Thomas Jefferson: "I have sworn eternal hostility against every form of tyranny over the mind of man". Name from dialogue. NCC from a screenshot. Class visually identified.

	U.S.S. Yangtzee Kiang	Danube-class
	DS9 Past Prologue. The Yangtzee Kiang was destroyed in a crash on a penal-colony moon in the Gamma Quadrant. DS9 Battle Lines. Named after a river in Asia. Name from dialogue. Class visually identified. The ST Encyclopedia speculates that the Yangtzee Kiang's registry number is NCC-72453.

U.S.S. Yeager NCC-61947

The Yeager was among the ships defending Sector 001 against the Borg incursion of 2373. Star Trek: First Contact.

Named after test pilot Chuck Yeager, the first human to fly faster than the speed of sound. Name and NCC from CGI model (Galen).

U.S.S. Yeager NCC-65674

The Yeager was stationed at Deep Space 9 from 2373 to 2375. DS9 Doctor Bashir, I Presume?. DS9 A Simple Investigation. DS9 Blaze of Glory. DS9 In the Cards. DS9 Sacrifice of Angels. DS9 Resurrection. DS9 The Magnificent Ferengi. DS9 Waltz. DS9 One Little Ship. DS9 Honor Among Thieves. DS9 Change of Heart. DS9 Wrongs Darker Than Death or Night. DS9 Inquisition. DS9 The Reckoning. DS9 Profit and Lace. DS9 Once More Unto the Breach.

Name and NCC from studio model. Side-view of the Yeager. Other pictures: Picture 1 | Picture 2

U.S.S. Yellowstone

The Yellowstone transported Ensign Melora Pazlar to Deep Space Nine in 2370. DS9 Melora.

Named after the United States' largest and oldest national park, which was established in 1872. Name from dialogue. The ST Encyclopedia speculates that the Yellowstone is a Sequoia-class vessel with the registry number NCC-70073.

	U.S.S. Yellowstone	Yellowstone-class
	The Yellowstone was the prototype for an advanced Starfleet runabout spacecraft that employed tetryon plasma warp nacelles. In an alternative reality, Ensign Harry Kim and Lieutenant Laska were key members of the Yellowstone design team in 2372. The craft lost antimatter containment and was destroyed when Kim was returning to his original reality. VOY Non Sequitur. Name from dialogue. Class from computer display. The ST Encyclopedia speculates that the Yellowstone's registry number is NX-74751.

	U.S.S. Yorktown
	The Yorktown was scheduled to rendezvous with the Enterprise in 2268 to transfer critically needed vaccines for planet Theta VII. The Enterprise was unable to make the rendezvous with the Yorkown until the investigation and destruction of the dikironium cloud creature was complete. TOS Obsession. The Yorktown, under the command of Captain Joel Randolph, was disabled by an alien space probe approaching Earth in 2286. The ship's chief engineer rigged a makeshift solar sail to provide emergency power. Star Trek IV: The Voyage Home. Tuvok's father served aboard the Yorktown in 2293. VOY Flashback. Named after the American aircraft carrier that fought in the Pacific theatre during World War II. Yorktown was the original name of Star Trek's spaceship, before the ship was called Enterprise, from Gene Roddenberry's first draft of the series outline written in 1964. Roddenberry reportedly suggested that the Enterprise-A, launched at the end of Star Trek IV: The Voyage Home, had previously been named the Yorktown, since it seems unlikely that Starfleet could have built an all-new ship so quickly. The name of the captain is from the Star Trek IV: The Voyage Home script. Name from dialogue. According to the Starfleet Technical Manual, the Yorktown is a Constitution-class vessel with the registry number NCC-1704.

	U.S.S. Yorktown
	In 2369, the Yorktown was mentioned by a woman in the Tilonus Institute for Mental Disorders. TNG Frame of Mind. The Yorktown, under the command of Capt. H. Zimmerman, visited planet Theta Omicron IV in 2370. Her next stay was at station Deep Space 9 on stardate 47550.1. DS9 Whispers. In the anti-time reality created by Q, Admiral William Riker ordered the Yorktown to make long-range sensor sweeps of the Devron system in search of a temporal anomaly. TNG All Good Things.... Name from dialogue. The ST Encyclopedia speculates that the Yorktown is a Zodiac-class vessel with the registry number NCC-61137.

	U.S.S. Yosemite	Oberth-class
	The Yosemite was severely damaged while conducting a study of the plasma streamer between a binary star pair in the Igo sector in 2369. During transport of plasma samples to the ship, quasi-energy microbes caused an explosion of a sample container, resulting in severe damage to the ship and the death of at least one crew member. TNG Realm of Fear. Later that year, the Yosemite was mentioned by a woman in the Tilonius Institute for Mental Disorders. TNG Frame of Mind. The Yosemite, under the command of Capt. J. Swift, visited planet New Brooklyn IX in 2370. Her next stay was at station Deep Space 9 on stardate 47552.9. DS9 Whispers. Named after the Yosemite National Park. Name from dialogue. Class visually identified. The ST Encyclopedia speculates that the Yosemite's registry number is NCC-19002.

	U.S.S. Yukon	Danube-class
	In 2372, Major Kira and Chief O'Brien used the Yukon to make an inspection tour of the Bajoran colonies along the Cardassian border. On their way home, they detected the first sign of a cloaked Klingon minefield around the Bajoran system. DS9 Sons of Mogh. The Yukon was destroyed by the starship Defiant in 2373 when a changeling infiltrator hijacked it in an effort to destroy the Bajoran sun with a trilithium explosive. DS9 By Inferno's Light. Named after a river in Northwest Canada and central Alaska flowing 1,979 miles to Bering Sea. Name from dialogue. Class visually identified. The ST Encyclopedia speculates that the Yukon's registry number is NCC-74602.

Starfleet ships A-Z