Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2199..928r&link_type=abstract
Proc. SPIE Vol. 2199, p. 928-937, Advanced Technology Optical Telescopes V, Larry M. Stepp; Ed.
Astronomy and Astrophysics
Astronomy
Scientific paper
One method of reducing the cost of a large terrestrial telescope is to fix its spherical primary mirror with respect to gravity and utilize a tracking mechanism revolved about the mirror's center of curvature to compensate for an astronomical image's ephemeral position and rate. To maximize throughput, hexagonal segments may be arrayed in a close-packed fashion on the primary sphere, but because regular hexagons do not tile a spherical surface, either the hexagons must be irregular, as in the Keck 10 m telescope, or they must be irregularly spaced. In either case, we can exploit the natural symmetry of the underlying geometry in order to define a truss generation scheme which is generally useful in both design and cost reduction.
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