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I'd follow the guidelines of the International Astronomical Union: the name of the star followed by a lower case letter. If the planet is the nth one discovered around that star, the letter is the n+1st letter of the alphabet. The letter "a" is unused to eliminate confusion with the star itself. For example, Gliese 581 g.
Let's make it easy for people to search databases, shall we?
I'd follow the guidelines of the International Astronomical Union: the name of the star followed by a lower case letter. If the planet is the nth one discovered around that star, the letter is the n+1st letter of the alphabet. The letter "a" is unused to eliminate confusion with the star itself. For example, Gliese 581 g.
Let's make it easy for people to search databases, shall we?
