The IRAIT (International Robotic Antarctic Infrared Telescope) project
(Tosti et al. , 2006, Proc. 6267-29 V. 2) is based on a 80 cm aperture
telescope to observe in the infrared range. It is due to start operations
in spring 2008, several months after installation in Dome C (Antarctica).
We present the contributions made to such project by the Institute for
Space Studies of Catalonia (IEEC) and the University of Granada, whose
participation is mainly focused in developing the moving optical system
for the secondary (M2) and tertiary (M3) mirrors of the telescope. Moving
parts of the optical system provide focusing and chopping capabilities,
implemented in M2, and a rotation mechanism, implemented in M3, allow
observation in either Nasmyth foci. The work package includes the design
and construction of both mirrors, the mechanical supports, the electronics
and the control software, all prepared to work at the low temperatures at
Antarctica. A Spanish company, NTE, was contracted to carry out the design
and manufacture. Tests at low temperature and integration in the telescope
have been done during summer 2006.