I hope we’re also transmitting at it, so as to “wake it up” in case it’s set to listen before it says anything. Also, while it has shown no non-Newtonian activity while within the solar system, there’s no reason that it couldn’t have done all its maneuvering prior to getting close enough to be seen, or that it won’t reorient itself again once it’s out of sight.
As for dealing with the distance, true it would have had to travel for millions of years at least to have come through known space from its point of origin, but if it really is artificial, there’s no reason its creators couldn’t have found some way to travel FTL that violates our current understanding of physics. For all we know, FTL travel could be blindingly obvious to a creature that can think in 5 dimensions (or more), or alternately is stupefyingly simple but we somehow just missed it (a la Turtledove’s “Road Less Traveled”).
Having discovered no intelligent life on Earth, it’s moving on.
Maybe it is indeed an artifact of intelligent life, but it is a dead husk of a craft, no longer powered but merely drifting according to Newtonian Law.
If it comes around again, I hope it enters our atmosphere and lands on Macross Island. Because that's when the fun starts.