Not sure. I think with the Gliese bodies, the letters were assigned in chronological order of discovery. I guess that makes sense since we could later find othe

Not sure. I think with the Gliese bodies, the letters were assigned in chronological order of discovery. I guess that makes sense since we could later find other bodies in between and not want to rename everything. https://en.wikipedia.org/wiki/Gliese_581_planetary_system https://en.wikipedia.org/wiki/Gliese_581_planetary_system