- The ST reference: The Worlds of the Federation identifies Ardana as the second planet of Mu Leonis A, though Star Charts identifies it as the third.
- The Worlds of the Federation also states Ardana has no moons, while another source  claims it has a single moon.
Ardana was, as of 2269, the only source of zenite in the Federation. The USS Enterprise visited Ardana in that year to collect a consignment of zenite to cure a botanical plague on Merak II. (TOS episode: "The Cloud Minders")
In 2377, Stratos's anti-gravity engines began to fail, threatening First City as well as the entire surface. A team from the Starfleet Corps of Engineers attempted to repair the engines, then failing that, to land the city safely. This effort failed when factions opposed to the city's preservation fired explosive armaments at the descending city, destroying it. (CoE eBook: Signs from Heaven)
In 2381, Ardana was one of the worlds targeted as part of a massive Borg invasion. The planet was saved through the sacrifice of the IRW Verithrax, a vessel in the fleet of the Imperial Romulan State. (Star Trek: Destiny novel: Lost Souls)
- See also: Ardanan.