Second Sun?

[Image: Tatooine]Apparently, there is evidence that our Sun (the star Sol) is part of a binary star system. That is to say that it’s supposedly possible that this Solar System has a companion star:

Cruttenden believes that Sedna’s unusual orbit is something indicative of the current solar system configuration, not merely a historical record. “It is hard to imagine that Sedna would retain its highly elliptical orbit pattern since the beginning of the solar system billions of years ago. Because eccentricity would likely fade with time, it is logical to assume Sedna is telling us something about current, albeit unexpected solar system forces, most probably a companion star”.

My question is: if there’s a second star affecting the orbit of planetoid bodies, how the hell can we have missed it? Seems like nearby stars would be kind of hard to miss. Next we’ll find out there’s two moons as well.

But maybe I’m missing something here.