  We report the first detection outside of the solar system of the lowest pure
rotational J=1-0 transition of the HD molecule at 112 microns. The detection
was made toward the Orion Bar using the Fabry-Perot of the Long Wavelength
Spectrometer (LWS) on board the Infrared Space Observatory (ISO). The line
appears in emission with an integrated flux of (0.93+/-0.17)e-19 Watts per cm
squared in the LWS beam, implying a beam-averaged column density in the v=0,
J=1 state of (1.2+/-0.2)e17 molecules per cm squared. Assuming LTE excitation,
the total HD column density is (2.9+/-0.8)e17 molecules per cm squared for
temperatures between 85 and 300 K. Combined with the total warm molecular
hydrogen (H2) column density of about (1.5-3.0)e22 molecules per cm squared
derived from either the H2 pure rotational lines, C18O observations or dust
continuum emission, the implied HD abundance, HD/H2, ranges from 0.7e-5 to
2.6e-5, with a preferred value of (2.0+/-0.6)e-5. The corresponding deuterium
abundance of [D]/[H]=(1.0+/-0.3)e-5 is compared with recent values derived from
ultraviolet absorption line observations of atomic HI and DI in interstellar
clouds in the solar neighborhood and in Orion.
