The ARCT (formerly IRT) at RAO
The A. R. Cross Telescope
Constructed in the early 1980's, The ARCT presently resides in the
largest dome on the property. The telescope is used extensively in the
senior astrophysics laboratories taught at the University of Calgary.
The primary mirror is an f/2.7, 1.8m New Generation honeycomb type
from Roger Angel's workshop in Tucson. With the chopping secondary, the
system is f/15 overall.
The ARCT is supported by an Alt-Alt mount equipped with 21-bit
encoders and DC servo motor, shaft-and-disk drives on both axes. The
entire structure rests upon two 4.5m vertical piers in a 10m dome.
This simple mounting and drive avoids the zenith 'catastrophe' of
Alt-Az mounts. It has proven to be reliable and smooth in operation
and easy to balance and control.
Below, are a few pictures of things related to the ARCT.
This page is perpetually under construction.