To take the comet 67P as example, it has a mass of 10^13 kg, which is a lot. I'm not sure what mass stations are supposed to have, but I assume it will be pretty high as well. So with F = (G*m1*m2)/r² you could calculate the gravitational force on each other.
Technically you could get every 2 objects in space to orbit each other, it would just be a question of how fast they are. So, depending on the size, it probably wouldn't exactly be a station orbiting the comet, but rather them orbiting each other, for the most part, and they would orbit very slowly.
All this is just an educated guess, I might be completely wrong