retrograde motion?

This is a homework question I am not sure about.

A large planet (jupiter mass) is orbiting a sun like star 100 light
years away from the earth. The star is easily visible with binoculars.
From the earth we should see the planets orbit edge on ( from the
side) using newtons law of gravity and his three laws of motion, esp
3rd, what sort of motion of the star should we see?

I guess it it seen in retrograde motion, because the star is not
orbiting around the planet, therefore the planet does not appear, hmmm
no, maybe it is a parallax?
help please?