  Large scale far-infrared (FIR) observations of the Orion complex at 205 and
138 micron are presented with an aim of studying the distribution of cold (< 25
K) dust. The maps in these FIR bands extend over approximately 3600 sq. arcmin
and cover regions around OMC-1, 2, 3 in Orion A and NGC 2023 and NGC 2024 in
Orion B. Some limited regions have also been mapped at 57 micron. A total of 15
sources in Orion A and 14 in Orion B (south) have been identified from our FIR
maps. Dust temperature distribution in both Orion A and Orion B (south) have
been determined reliably using the maps at 205 & 138 micron obtained from
simultaneous observations using almost identical beams (1.6 dia). These
temperatures have been used to generate map of the optical depth at 150 micron,
for the Orion B region. The coldest source detected is in OMC-3 and has a
temperature of about 15 K. The diffuse FIR emission in the different
sub-regions is found to vary between 25% to 50% of the total FIR emission from
that sub-region.
