From Gareth Williams, IAU Minor Planet Center
In reporting the discovery of the new satellite of Pluto (30 July, p 14), there is no need to state that it “has been dubbed P4”. It already has an official provisional designation from the International Astronomical Union: S/2011 P 1.
The use of nicknames is, unfortunately, common. Also, a name cannot be assigned to the satellite until it receives its permanent numerical designation: these are issued sequentially to such discoveries, and that won’t happen until a reliable orbit has been observed.
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