  A faint star located 2 arcsec from KIC 8462852 was discovered in Keck 10 m
adaptive optics imaging in the $JHK$ near-infrared (NIR) in 2014 by Boyajian et
al. (2016). The closeness of the star to KIC 8462852 suggested the two could
constitute a binary, which might have implications for the cause of the
brightness dips seen by {\it Kepler} (Boyajian et al. (2016) and in
ground-based optical studies Boyajian et al. (2018). Here, NIR imaging in 2017
using the Mimir instrument resolved the pair and enabled measuring their
separation. The faint star had moved $67 \pm 7$ milliarcsec (mas) relative to
KIC 8462852 since 2014. The relative proper motion of the faint star is $23.9
\pm 2.6$ mas yr$^{-1}$, for a tangential velocity of $45 \pm 5$ km s$^{-1}$ if
it is at the same 390 pc distance as KIC 8462852. Circular velocity at the 750
AU current projected separation is $1.5$ km s$^{-1}$, hence the star pair
cannot be bound.
