Abstract
Active control of the secondary mirror, mainly for correction of
the decentering coma, is an essential tool for an active-optics
telescope. The Italian Telescopio Nazionale Galileo is equipped
with a secondary mirror supported by an hexapod mechanical structure,
providing a positioning control with six degrees of freedom. The
hexapod system has been built and tested to characterize its
performance. The results show that the errors in the positioning of
the secondary mirror lead to an aberration image well below the
diffraction figure of the telescope.
© 1998 Optical Society of America
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