  LBQS 0103$-$2753 is a binary quasar with a separation of only 0.3 arcsec. The
projected spacing of 2.3 kpc at the distance of the source (z = 0.848) is much
smaller than that of any other known binary QSO. The binary nature is
demonstrated by the very different spectra of the two components and the low
probability of a chance pairing. LBQS 0103$-$2753 presumably is a galaxy merger
with a small physical separation between the two supermassive black holes. Such
objects may provide important constraints on the evolution of binary black
holes and the fueling of AGN.
