From Halopedia, the Halo wiki
A reference to a champagne of a "Beta Centauri vintage" was made in the original edition of Halo: The Fall of Reach, implying the system had been colonized by humanity. "Beta Centauri" was changed to "Procyon" in the 2010 edition of the novel. This is likely due to the fact the system is situated well beyond the known sphere of influence of humanity and thus unlikely to house a colony.
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