Sirius IX was the inhabited ninth planet in the Sirius system, approximately eight light years from Sol. (TNG: "The Naked Now" production art) The planet had at least a thousand inhabitants, who allegedly had an unique biochemistry.

At some point before stardate 4978, Harry Mudd sold a love potion to a thousand people on Sirius IX. When they became ill, Mudd quickly left the planet. (TAS: "Mudd's Passion")

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