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 Post subject: Re: Exomoon Notation
PostPosted: Thu Aug 18, 2016 5:18 pm 
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Traveller wrote:
If I'm not mistaken however, the IAU starts with lowercase b for planets, since the star itself they treat as a lowercase a if describing a system. Using their system, in short there can never be a planet a. So using my example of Proxima, the IAU would give the potential planet a lowercase b, making the planet Alpha Centauri Cb rather than Ca.

I attempted to mimic the IAU in my star system generation rules, but what I gave above is simpler, since there is no wondering WHY there is no planet a in a system.


Yeah, they do that. It annoys me :). I think planets should start with 'a' - the star isn't a planet, after all. Calling the first planet "b" implies that there's something called "a" when there isn't. And it's daft give that the first moon around a planet in the solar system is "I", not "II".

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 Post subject: Re: Exomoon Notation
PostPosted: Thu Aug 18, 2016 10:32 pm 
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I use Arabic numerals for planets and lower-case Latin letters for regular moons, cataloguing each in order from the centre outwards. It is one of my goals to make it clear that I am not using official catalogue entries, which go in order of time-of-discovery.

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 Post subject: Re: Exomoon Notation
PostPosted: Fri Aug 19, 2016 1:30 am 
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It's certainly a lot easier to write "Sol f66" to describe the 66th moon of Saturn than "Sol fLXVI". Of course, the IAU would call it "Sol gLXVI", but compared to the definition of a dwarf planet, ignoring the letter a is minor.

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