Odin is the result of a unique collaboration between astronomers and
aeronomers. The satellite is aimed for studies of both astronomical
targets and the Earth's atmosphere. The main instrument is a radiometer,
fed by a 1.1m telescope, operating in four selected sub-mm bands plus one
band at 119GHz. This instrument will be used by both disciplines. The
astronomy observations will concentrate on galactic studies of molecular
clouds, with and without ongoing star formation. Diagnostically important
lines of H 
O vapour, molecular oxygen, carbon monoxide and neutral
carbon can be observed with a hitherto unprecedented sensitivity. Odin
will therefore allow us to further develop our PIROG science and, in
particular, the studies based on the ISO/LWS programmes. The Odin
astronomy programme consists of several sub-programmes; members of our
group are lead scientists for three major sub-programmes, one concerning
giant molecular clouds, one focusing on star-formation in dense molecular
cores and one aiming for a large-scale survey of the Galactic plane,
including special studies of the Galactic Centre. Nordh is Programme
Scientist and chairman of the international Odin Science Team.
On the technical side, the Stockholm Observatory has been responsible for the cryostat for housing the mixer blocks and the pre-amplifiers, work being done in collaboration with the Swedish Space Corporation and ACR Electronic. The group is also participating in the software development for scheduling the observations.