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The Tarchannen system was an uninhabited planetary system. This system consisted of a primary and at least three planets. The third planet was the homeworld for a non-sentient species. (TNG: "Identity Crisis")

According to the script, the pronunciation for Tarchannen was "tar-CHAN-in". [1]
The script thrice describes Tarchannen III as being a world of "perpetual twilight"; it is unclear whether this refers to the brightness of the system's sun or the planet itself being tidally-locked.
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