  We measure alignments on scales of 1 Mpc $h^{-1}_{71}$ for galaxies in Abell
1689 ($z=0.18$) from an existing Hubble Space Telescope mosaic. We find
evidence of galaxy alignment in the inner 500 $h^{-1}_{71}$ kpc. The alignment
appears to be stronger towards the centre and is mostly present among the
fainter galaxies, while bright galaxies are unaligned. This is consistent with
a model where alignments originate from tidal locking.
