Sol, a G-type star
A G-type star was a classification for a yellow star. Main sequence G-type stars were called yellow dwarfs. Sol was an example of a small G-type star. It is a main-sequence star (luminosity class V) of spectral type G. Such a star has about 0.8 to 1.2 solar masses and surface temperature of between 5,300 and 6,000 K. Like other main-sequence stars, a G-type main-sequence star is in the process of converting the element hydrogen to helium in its core by means of nuclear fusion. The Sun, the star to which the Earth is gravitationally bound in the Solar System, is by far the best known example of a G-type main-sequence star— being by far the closest star to earth with an Apparent magnitude dwarfing all other celestial objects. Each second, the sun fuses approximately 600 million tons of hydrogen to helium, converting about 4 million tons of matter to energy. Besides the Sun, other well-known examples of G-type main-sequence stars include Alpha Centauri A, Tau Ceti, and 51 Pegasi.
A Vissian starship of the 22nd century was capable of entering the photospheres of most G-type stars, thanks to its trinesium hull. (ENT: "Cogenitor")
In 2152, Enterprise NX-01 followed the warp signature of a Tellarite bounty hunter, Skalaar, to a G-type star, only to find that it was a decoy subspace beacon. (ENT: "Bounty")
The Calindra system in the Delphic Expanse is a G-type star system. (ENT: "Proving Ground")
The Dyson sphere discovered by the USS Enterprise-D in 2369 surrounded a G-type star. (TNG: "Relics")
In an alternate 2370, an anti-time eruption had an energy output equivalent to ten G-type stars. (TNG: "All Good Things...")
Ocampa, in the Delta Quadrant, is a planet located in a G-type star system. (VOY: "Caretaker")
A G-type star system with two inhabited planets was part of Vidiian territory in 2372. The USS Voyager traveled through a plasma drift to avoid detection from the Vidiians. (VOY: "Deadlock")
The subspace sinkhole found in the Delta Quadrant led to a subspace pocket containing a G-type star and three planets. (VOY: "Gravity")
The uninhabited planet selected by Seven of Nine for the surviving Vaadwaur in 2376 orbited a G-type star. (VOY: "Dragon's Teeth")
Seven of Nine noted that USS Voyager's sensors detected two G-type stars in a region of space believed to be under the control of the R'Kaal. (VOY: "Renaissance Man")
External links
- G-type star at Wikipedia
- G class star at Memory Beta, the wiki for licensed Star Trek works