40 Eridani

The Vulcan system is a trinary star system, the home system of the Vulcan race and their homeworld of Vulcan.

The primary of the Vulcan system is 40 Eridani A (aka: Omicron 2 Ceti) a spectral type K1V star. The system has three planets: the planet closest to the primary star is a class B uninhabited world; the other two planets are T'Khut, which has one moon, and Vulcan, which are in a binary orbit with each other.

After the planets is an asteroid belt, and then two more stars, which are also in a binary orbit. (Star Trek: Star Charts)


 * 40 Eridani A
 * Class B planet
 * Vulcan
 * T'Khut
 * 40 Eridani B
 * 40 Eridani C

"Star Trek: The Worlds of the Federation" contradicts "Star Trek: Star Charts", as it does not mention the second and third star outside of the asteroid belt.