Phardos (also known as Procyon B and Alpha Canis Minoris B) was a white dwarf star, along with a companion star named Procyon (A), located about 3.49 parsecs (11.4 light-years) from Earth, where it was visible in the constellation of Canis Minor. (ST references: Star Fleet Technical Manual, Spaceflight Chronology)

On several occasions in 2364, viewscreen readouts aboard the USS Enterprise-D showed the location of Procyon B, in the form of charts from the Enterprise library computer. (TNG episodes: "The Naked Now", "The Last Outpost", "Conspiracy")

The Chronology depicted Procyon B's name and distance from Earth on star chart illustrations, but since it is a "real" star, modern scientists know a few things about its makeup that weren't in its Star Trek mentions. It is notable that Procyon was briefly glimpsed onscreen in canon productions of Star Trek because the production staff copied their star charts from the earlier, non-canon Chronology.
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