  We perform UBR imaging and optical spectroscopy of the interacting galaxy
pair Arp 104, at z=0.0098. This consists of NGC5218, a disturbed Sb barred
spiral with an inclined outer shell, the round spheroidal NGC5216, a connecting
bridge of length 50 kpc and a curved plume. Neither galaxy shows emission
lines. NGC5218 has strong Balmer lines and appears to have undergone a major
starburst some 0.2 Gyr ago, triggered by the last close passage of the two
galaxies. The galaxy is very red in its centre, suggesting it is dusty, but its
outer regions, and the bridge connecting the two galaxies, have the blue
colours of 0.2-0.4 Gyr old stars. NGC5216 lacks strong Balmer lines but outside
its centre is blue in U-B, suggesting it experienced a star-formation episode
only about 40 Myr ago. This could have been fuelled by gas from
  NGC5218, transfered through the bridge. The bridge passes through NGC5216 to
emerge as a plume extending 14 kpc to the SW. The plume, from its colours, is
very young and may be a site of ongoing star-formation or the formation of a
tidal dwarf galaxy.
