(covers information from several alternate timelines)
Coridan system was an inhabited planetary system in the Alpha Quadrant. A planet in this system, Coridan, was the homeworld for the Coridans, a warp-capable humanoid species. Other planets in this system were colonized by this species prior to 2151.
In 2151 Captain
Archer and T'Pol visited Coridan, were captured by rebels, and were freed by Andorian agents, including Thy'lek Shran. ( : " ENT ").
Shadows of P'Jem
2267, the Coridan planets were admitted to the United Federation of Planets. The system was located near to the planets Orion and Vulcan, and several unidentified neutral worlds. ( : " TOS "; Journey to Babel : " DS9 "; In the Cards : " ENT ")
In the ( alternate 2259, Magustav Pachangara was elected chancellor of this system. This event was reported in a news ticker, which was in a collection of graphics and video media that were seen on a powerwall in the offices of Christopher Pike and Alexander Marcus at Starfleet Headquarters. )
Star Trek Into Darkness
The ticker can be seen in the video "
Star Trek: Into Darkness
" - User Interface VFX at vimeo.com. 
2373, Kandra Vilk moved from Deep Space 9 to a neutral planet near the Coridan system because of the impending war with the Dominion. ( : " DS9 ")
In the Cards
The Coridan system was a target of
Jem'Hadar raids during the Dominion War due to its importance as a source of dilithium, even though it was not on the front lines. ( : " DS9 ")
One Little Ship
"CORE-ah-don" was the pronunciation for this planet's name from the script pronunciation guide for "Sarek". 
According to the
Star Trek: Star Charts (pp. 45, 60, "United Federation of Planets I"), the Coridan (or Chi 1 Orionis) system was located in or near Federation space. This was a trinary star system. Coridan A was a G-class star with a magnitude of +3, which was ten times brighter than Sol. Coridan B and Coridan C were both G-class stars.
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