To add on to this. The moon will also be in alignment. The killshot is two things. First, if this is some type of brown dwarf, its magnetic field may oppose earth's, which could cause our magnetic field to either top protecting us temporarily, or even cause a pole shift. In addition to the magnetic field being compromised, the body will also interact with the sun and cause solar flares and cme's in its direction (towards us, because of the alignment). In addition, because it is coming between us and the sun, it will disrupt our magnetic portals with the sun.