  The recently puplished Barber-Tennyson (BT2) synthetic H$_2$O water line list
is the most complete and accurate line list in existence. It is finding
application in a wide range of astrophysical environments.
  UKIRT spectra of comet Tempel 1, obtained after the 'Deep Impact' event,
revealed several known H$_2$O solar pumped fluorescent (SPF)lines in the 2.8945
to 2.8985 $\mu$m region. In addition, using synthetic spectra produced with
BT2, several emission lines were identified that had not previously been
recorded in cometary spectra. Unlike the SPF lines, which are transitions from
doubly-excited stretch states, these transitions, that we label 'SH', are from
states with three or four quanta of vibrational excitation. The SH features
were particularly strong during the period 20-40 minutes after impact.
