Vulcan/Vega System

40 Eridani: The Vulcan Star System. The main star of the system, 40 Eridani A, is an orange star with a planetary system orbiting around it.

Vega (Ve'ga): A large gas giant with a unique history of formation. This is because its system of satellites formed around it after it migrated inwards from the frost line to the outer region of the habitable zone. Vega's original moons were icy masses that eventually became unstable and broke apart, forming rings and the second generation moons. Several of the massive rocky planets that formerly occupied the inner system were captured into orbit around Vega. The planets themselves eventually had their own orbit destabilized and further destabilized the second generation moons. The moons crashed together and broke apart, finally recombining into the relatively stable system we have today. This third generation satellite system is composed of approximately 10% of the ice of the 1st generation's system, but also of the huge mass of rock that Vega captured into orbit around itself. For this reason, the current moons of Vega are rocky terrestrial planets, not icy moons.

-Alpha Vega: A dark, rocky, and volcanic world inferior to Vulcan.

-Beta Vega (Vulcan): A lighter, largely deserted world with some oceans and an oxygenated atmosphere, covered in volcanoes from tidal interactions between it, Vega, and the other moons. It is a life-bearing moon, life having become accustomed to the high surface temperatures and gravity. Beta Vega is by Federation standards a "Minshara-Class" planet, though it is interesting to note that the original Vulcan classification scheme describes Minshara-class planets as being similar to ocean-covered, lusher worlds such as Earth. Vulcan itself is described in the original Vulcan as "Vulcan Class."

-Gamma Vega (T'khut): A co-orbital moon with Beta Vega. It's very similar in size, geology, and composition to Vulcan, but completely deserted and lifeless save for the most lowly of bacteria. It shares an orbit with Beta Vega, being 60 degrees further ahead in its orbit than it.

-Delta Vega: A cold icy moon of Vega, with pools of meltwater forming in the warmer lowlands. With a thin atmosphere, water will boil in the highlands of the planet. Massive rifts generated by tidal interactions with Vega, Vulcan, and T'khut sometimes rip the surface apart. If the rifts reach the underground ocean, the water can boil to the surface. While some of the water rains or snows back to the surface later, a significant amount of water has slowly been boiling out into space. It is thought that in around a billion years, Delta Vega will have lost its ocean to space. Despite the sparsity of the Deltavegan atmosphere, the atmosphere remains breathable to Vulcans due to a high concentration of oxygen. It is more difficult for humans to breathe in the atmosphere, but it is not at dangerously low levels.

-Epsion Vega: A small Luna-sized rocky satellite making up the majority of the satellites composed of the leftovers of the main massive group of satellites.

-Zeta Group: A collection of small rocky bodies that make up the rest of the leftovers of the main massive group of satellites.