Quote:
Originally Posted by Ryan_Phx
Thanks for replying. I looked up Asimov's Nemesis, and I'm pretty sure that isn't what I'm thinking of. I'm wondering if I'm wrong about the "Nemesis" part....
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Had to try

The only other nightflyer I remember is "The Night Flier" a short story by Stephen King - but no spacecraft or 10th planet in that.
You may want to take a look at this Wikipedia page about
fictional planets of the solar system. Down in the "Trans-Neptunian planets" section there's a dozen books listed that you may want to look through.