|Vulcan (40 Eridani)|
40 Eridani, commonly known as known as the Vulcan system (or Vulcanis system), is 16 lightyears from Earth and the location of the planet Vulcan. It is a trinary system, with 40 Eridani A being the main star. The other two stars in the system, 40 Eridani B and 40 Eridani C, orbit 40 Eridani A every 8,000 years and each other every 250 years or so.
The system was a focal point during the Dominion War with three separate attacks targeted at the system in 2374. The Dominion's first attack reached the edge of the system before it was halted and after eight weeks of fighting Dominion forces were forced out of the system. Their second attempt reached the fifth planet before it was again defeated. The third and final attempt made to conquer the system was defeated at the system's Oort cloud. (The Dominion War Sourcebook: The Fires of Armageddon)
- Vulcanis I
- Vulcanis II
- Vulcanis III
- Vulcanis IV
- Kal-Ap-Ton (Vulcanis V)
- 12 natural satellites
- Kir-Alep (Vulcanis VI)
- The number of planets is based on the reference book, Star Trek: Star Charts.
- The Dominion War Sourcebook: The Fires of Armageddon lists at least six planets within the system.
- 40 Eridani is a real star system, located approximately 16 light years from the solar system.