doesn't work at all, completely breaks down for the planetoids and moons...

which makes sense, since those names are not german, which is why german grammar doesn't apply to them.

latin loanwords work the same way in german as they do in latin: completely at random and just have to be memorized...but at least they do follow the gender of the deity, so if you know your greco-roman pantheon it's pretty easy!

edit: also a very weird example, with a weird rule about ending in "e"; venus and earth (erde) are the only female planets...